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Post by thewizard8 on Raspberry PI4 Serial Port ^{CODESYS Forge} ^talk ^(Post)
Hi Dear All, I'm using my raspberry PI4 as a CoDeSyS PLC (Build from scratch with custom electronics). I was able to implement all fieldbuses with the exception of Modbus Serial. I'm using the internal Port (GPIO) and I configured it in /etc/Codesyscontrol_user.cfg the following away: [SysCom] Linux.Devicefile.1=/dev/ttyUSB0 Linux.Devicefile.2=/dev/ttyS0 I'm using COM2 on Master configuration. I'm using a interface board from TTL/RS485 (bidirectional board), and it's works perfectly with other devices but not in CoDeSyS. I'm able to send data with python script and read it on my pc using putty, but when I use a modbus slave simulator to interface with codesys I always get red icons on master and slave. (Please find image attached). I'm pretty shure that this might be a bad parameter on my CoDeSyS runtime configurstion file. Can someone help me? I'm stuck and this is for my master degree certification.
Last updated: 2024-03-18

Post by umdee on Error when monitoring LAD programs ^{CODESYS Forge} ^talk ^(Post)
System Information from the computer being used: OS Name Microsoft Windows 11 Pro Version 10.0.22631 Build 22631 Other OS Description Not Available OS Manufacturer Microsoft Corporation System Manufacturer Dell Inc. System Model Latitude 5500 System Type x64-based PC System SKU 08B9 Processor Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz, 2112 Mhz, 4 Core(s), 8 Logical Processor(s) BIOS Version/Date Dell Inc. 1.3.11, 6/11/2019 SMBIOS Version 3.2 Embedded Controller Version 255.255 BIOS Mode UEFI BaseBoard Manufacturer Dell Inc. BaseBoard Product 0M14W7 BaseBoard Version A00 Platform Role Mobile Secure Boot State On PCR7 Configuration Elevation Required to View Windows Directory C:\WINDOWS System Directory C:\WINDOWS\system32 Boot Device \Device\HarddiskVolume1 Locale United States Hardware Abstraction Layer Version = "10.0.22621.2506" User Name CARDASSIA-IX\Engineer Time Zone Eastern Daylight Time Installed Physical Memory (RAM) 16.0 GB Total Physical Memory 15.8 GB Available Physical Memory 4.67 GB Total Virtual Memory 18.5 GB Available Virtual Memory 2.52 GB Page File Space 2.63 GB Page File C:\pagefile.sys Kernel DMA Protection Off Virtualization-based security Not enabled Windows Defender Application Control policy Enforced Windows Defender Application Control user mode policy Off Device Encryption Support Elevation Required to View Hyper-V - VM Monitor Mode Extensions Yes Hyper-V - Second Level Address Translation Extensions Yes Hyper-V - Virtualization Enabled in Firmware Yes Hyper-V - Data Execution Protection Yes
Last updated: 2024-03-19

Post by leafy on Use third party actuator with IO-Link Master (IFM) ^{CODESYS Forge} ^talk ^(Post)
Hey there! I am currently doing a little automation project for uni. I am trying to integrate a control-valve-system (Buerkert AirLINE Field) in my IO-Link environment. With IFM sensors, I used their pre-built function blocks, but with this third-party device, i need to write my own function block. Thankfully, IFM provides a generic sensor-fb so I can write my own FB with "extends" and "super". So far, so good. I found the IODD and some other documentation and I thought I get how it works, but somehow can't really get it to work at all. From my understanding, i need to write data into the PDO-Array. But i get confused with the indices and subindices of IO-Link. I'll append the IODD and some screenshots of my project. There is an AOI for LogicXDesigner, but I can't use that in Codesys. I hope someone has integrated a IOL-device in Codesys before and can help me with this. Cheers leafy
Last updated: 2024-04-16

Post by mogam on Internal error:System.NullReferenceException: The object reference was not set to an object instance. ^{CODESYS Forge} ^talk ^(Post)
Hi everyone, I have a my App that reads values from a shared memory than 2 variables x,y were calculated. here as you can see in my code: PROGRAM PLC_PRG VAR szName : STRING := '/SM'; ( Name of the shared memory.) uxiSize : __UXINT := 646 * 2 * SIZEOF(REAL); ( Size of the shared memory. ) hShm : RTS_IEC_HANDLE; ( Handle to the shared memory ) pStart : POINTER TO REAL; ( Pointer to the first element in the memory ) pData : POINTER TO REAL; ( Pointer, which is incremented until the last sign in the memory is reached. ) shared_data :ARRAY[0..645, 0..1] OF REAL; velocity : ARRAY[0..2] OF REAL; ( Velocity array ) position : ARRAY[0..2] OF REAL; ( Position array ) angleDepth : ARRAY[0..645, 0..1] OF REAL; ( Angle and depth array ) xEndOfMemory : BOOL; x : ARRAY[0..645] OF REAL := 1.0; y : ARRAY[0..645] OF REAL := 1.0; (* Result of actions at the memory. *) OpenResult : RTS_IEC_RESULT; ReadResult : RTS_IEC_RESULT; PointerResult : RTS_IEC_RESULT; DeleteResult : RTS_IEC_RESULT; CloseResult : RTS_IEC_RESULT; i : INT; END_VAR ( Open the shared memory ) hShm := SysSharedMemoryOpen2(szName, 0, ADR(uxiSize), ADR(OpenResult)); IF hShm <> RTS_INVALID_HANDLE THEN (* Read the entire shared memory table *) SysSharedMemoryRead(hShm:= hShm, ulOffset:= 0, pbyData:= ADR(shared_data), ulSize:= uxiSize, pResult:= ADR(ReadResult)); (* Fetch the pointer from the shared memory. The pointer is pointing to the first element address *) //pStart := SysSharedMemoryGetPointer(hShm, ADR(PointerResult)); (* Close the shared memory *) //CloseResult := SysSharedMemoryClose(hShm := hShm); (* Read velocity and position data from the shared memory *) FOR i := 0 TO 2 DO velocity[i] := shared_data[i, 0]; position[i] := shared_data[i, 1]; END_FOR; (* Read angle and depth data from the shared memory *) FOR i := 0 TO 645 DO angleDepth[i, 0] := shared_data[(i + 6), 0]; angleDepth[i, 1] := shared_data[(i + 6), 1]; END_FOR; FOR i := 0 TO 645 DO x[i] := angleDepth[i, 1]*COS(angleDepth[i, 0]); y[i] := angleDepth[i, 1]*SIN(angleDepth[i, 0]); END_FOR; END_IF For these values an XY-CHART needs to be done and when i create a visualisation and set the x data and y data when i try to compile, i recieve this error: ------ Übersetzungslauf gestartet: Applikation: Device.Read_App ------- Code typisieren ... [FEHLER] Internal error:System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt. bei _3S.CoDeSys.LanguageModelManager.LDateType.Accept(ITypeVisitor typvis) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IArrayType ) bei ..(_IPointerType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IPointerType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IPointerType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..(_ISignature , _IPreCompileContext ) bei ..( ) bei ..(String ) bei ..(String , IVariable[]& , ISignature[]& ) bei ..(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei _3S.CoDeSys.Compiler35140.Compiler.(_ICompileContext , _IPreCompileContext , _ICompileContext , IProgressCallback ) bei _3S.CoDeSys.Compiler35140.Compiler.(_ICompileContext , Boolean , Boolean , _IPreCompileContext , _IPreCompileContext , _ICompileContext , Boolean , Boolean& , IProgressCallback ) bei _3S.CoDeSys.Compiler35140.Compiler.(Guid , Boolean , Boolean , Boolean , Boolean& , _ICompileContext& , _ICompileContext& , IProgressCallback , Boolean , Boolean ) Kompilierung abgeschlossen -- 1 Fehler, 0 Warnungen Übersetzung abgeschlossen -- 1 Fehler, 0 Warnungen : Kein Download möglich!
Last updated: 2024-05-24

Post by paro on Modbus Client Request Not Processed ^{CODESYS Forge} ^talk ^(Post)
Hi, Problem in your code is that you are not calling the ClientFb cyclic. Please look at the Example from CODESYS: https://forge.codesys.com/prj/codesys-example/modbus/home/Home/ Your code works if the client fb is called cyclic! IF NOT initDone THEN initDone := TRUE; // configure clientTcp clientTcp(aIPaddr:=Ethernet.IPAddress, uiPort:=502); // configure clientSerial clientSerial(iPort:=SysCom.SYS_COMPORT2, dwBaudRate:=SysCom.SYS_BR_115200, byDataBits:=8, eParity:=SysCom.SYS_EVENPARITY, eStopBits:=SysCom.SYS_ONESTOPBIT, eRtuAscii:=ModbusFB.RtuAscii.RTU); // configure clientRequestReadCoils_1 clientRequestReadCoils_1(rClient:=clientTcp, uiUnitId:=42, udiTimeout:=TO_UDINT(T#10MS)); // configure clientRequestWriteSingleRegister clientRequestWriteSingleRegister(rClient:=clientTcp, uiUnitId:=43, udiTimeout:=TO_UDINT(T#10MS)); // configure clientRequestReadCoils_2 clientRequestReadCoils_2(rClient:=clientTcp, uiUnitId:=44, udiTimeout:=TO_UDINT(T#10MS)); // configure clientRequestReadInputRegisters clientRequestReadInputRegisters(rClient:=clientTcp, uiUnitId:=44, udiTimeout:=TO_UDINT(T#10MS)); END_IF // call the client FB's clientTcp(); clientSerial(); // call client request FB's clientRequestReadCoils_1(rClient:=clientTcp, xExecute:=TRUE, uiStartItem:=2, uiQuantity:=3, pData:=ADR(aDataCoils_1[0])); // for more details see Example_TCP, especially ClientRequest control (xExecute, xDone, xError). IF clientRequestReadCoils_1.xDone THEN // get data from aDataCoils_1 ... END_IF clientRequestWriteSingleRegister(rClient:=clientTcp, xExecute:=TRUE, uiItem:=3, uiValue:=123); clientRequestReadCoils_2(rClient:=clientTcp, xExecute:=TRUE, uiStartItem:=2, uiQuantity:=3, pData:=ADR(aDataCoils_2[0])); clientRequestReadInputRegisters(rClient:=clientTcp, xExecute:=TRUE, uiStartItem:=16, uiQuantity:=3, pData:=ADR(aDataInputRegisters[0]));
Last updated: 2024-05-29

Post by cmj-icsys on Custom configure tab in device editor ^{CODESYS Forge} ^talk ^(Post)
Hi everyone, I’m developing a custom CODESYS I/O driver for my company’s device, and I’ve been studying the example projects in CODESYS V3.5 SP20 Patch 5. In the IOMappingExample.project, I noticed that EtherCAT devices provide additional configuration tabs in the Device Editor, such as General, Process Data, etc. However, for custom I/O driver examples (based on IoDrv), the Device Editor only shows the default tabs like <devicename> I/O Mapping or <devicename> Parameters.</devicename></devicename> I’d like to create custom tabs or configuration pages in the Device Editor (e.g., “General Settings”, “Communication”, etc.) to allow users to configure parameters in a more structured way. Could anyone explain: How to define and register custom tabs or UI pages in the Device Editor? What tools or SDKs are needed to create UI elements such as combo boxes or check boxes? How to bind those UI controls to device parameters defined in the XML (device description)? Any example, SDK reference, or documentation link would be really helpful. Thanks in advance!
Last updated: 2025-10-20

Post by mil581 on Modbus TCP Server connection is ESTABLISHED but all holding registers are value 0? ^{CODESYS Forge} ^talk ^(Post)
Hello everyone! I'm facing a weird issue with CODESYS Control Win V3 x64 on a fresh Windows install. The situation is as follows: CODESYS Modbus TCP Server (Slave) is running and I can see live values in the mapping display of Modbus settings: GVL (e.g., 32, 42, 50). Port 502 is LISTENING according to netstat. When connecting via Modbus Poll or Node-RED, the connection status changes to ESTABLISHED and everything reports as fine. The Problem: Despite the successful connection, all holding registers return 0 no matter what. It's like the OS accepts the TCP handshake, the request counter goes up but the data payload never reaches Modbus Client (in this case Node-RED or Modbus Poll). Quick Stats: Firewall: Completely OFF. Unit ID: Verified & Matching. IP: Tried 127.0.0.1 and 192.168.0.1. Interface: Correctly bound in Ethernet Device settings. I already tried absolutely everything from changing IP address, subnet, port, deleting the project and starting new one and even nuking my old Windows install. Since I am near completion of my bachelor thesis only thing left for me to do is connect SoftPLC to NodeRED via Modbus but this issue is driving me crazy for weeks. I do not know what to do anymore.
Last updated: 2025-12-25

Post by baott569 on CODESYS OPC UA Security: HMI Client Not Receiving Server Certificate ^{CODESYS Forge} ^talk ^(Post)
Hello everyone, I am currently using OPC UA in CODESYS with the security mode BASIC256SHA256 – Signed and Encrypted. The OPC UA Server is running on an RTE CX device, and the HMI is running on another computer. I have reviewed many CODESYS documents and successfully established communication when the security mode is set to None with Anonymous login. However, when security is enabled, the server does not provide its certificate for the CODESYS HMI client to trust. Interestingly, the client can send its certificate to the server, and UAExpert works normally, but the CODESYS HMI client does not receive the server certificate. Can anyone help clarify what I might be missing? I have been stuck on this issue for three days. If I missed or misconfigured any step, please let me know. I believe I am stuck at step 15 in the following CODESYS guide: Encrypting the Communication of a Data Source OPC UA Client https://content.helpme-codesys.com/en/CODESYS%20Communication/_cds_encrypt_communication_data_sources_opc_ua_client.html Thank you very much.
Last updated: 2026-01-06

Post by mjam04 on AM243 LaunchPad as PROFINET Device with CODESYS – RPC Aborted error when scanning devices ^{CODESYS Forge} ^talk ^(Post)
Hello, I am currently trying to use the AM243 LaunchPad as a PROFINET device and connect to it using CODESYS. In my setup I am also using a Raspberry Pi running the CODESYS PROFINET Runtime, which acts as the PROFINET controller. The setup of the Profinet controller is correct, so all devices are in the same subnet. However, I encounter an issue when scanning for PROFINET devices in CODESYS. The AM243 LaunchPad appears in the scan results, but the following error is reported: RPC Aborted: 0x16C9A049 Additionally, CODESYS shows the message that the identification data is not available and the IP address should be checked. Because of this error, the controller cannot establish a connection to the device. Another observation is that I cannot ping the AM243 LaunchPad from my PC, even though I configured what should be the correct IP address. Setup: PROFINET Device: AM243 LaunchPad PROFINET Stack: Industrial Communication SDK example PROFINET Controller: Raspberry Pi running CODESYS with PROFINET Runtime Engineering PC: CODESYS IDE Network: Ethernet connection between PC, Raspberry Pi, and AM243 In the attachments there is a screenshot of the corresponding error. Did anybody had the same error? Any hints or debugging suggestions would be greatly appreciated. Thank you!
Last updated: 2026-03-13

Post by kiranbsiddaiah on CodeSys OPC UA client Unable to Connect To OPC UA sever through Username and password ^{CODESYS Forge} ^talk ^(Post)
Hi, I'm using codesys v3.5 sp21 software. I have downloaded the sample opc ua client project from https://content.helpme-codesys.com/en/CODESYS%20Examples/_ex_uacapi_example.html and i tested connecting to "prosys opc ua simulation server". Through Anonymous connection it is connecting to server and can read data. Later tried to connect using username and password. First got a SECURITY_CHECKS_FAILED error, trusted the client certificate in the server and this issue resolved. Next got an INVALID_CERTIFICATE error, trusted the server certificate in the client and this issue resolved. After these two error it is not establishing the connection and not giving any error messages. UAAsyncProp: UA.AsyncProperty := (tnTaskName:='UAClientTask', usiTaskPrio:=20, udiTaskInterval:=10000); UAPolicy: UA.SecurityPolicy := (sPolicy:=UA.OpcUa_SecurityPolicy.OpcUa_SecurityPolicy_Aes128Sha256RsaOaep, eSecurity:=UA.SECURITY_MODE.SIGN_AND_ENCRYPT); //UAPolicy: UA.SecurityPolicy := (sPolicy:=UA.OpcUa_SecurityPolicy.OpcUa_SecurityPolicy_None, eSecurity:=UA.SECURITY_MODE.NONE); UAAuth: UA.UserNameAuth := (sUserName:=UAVars.sUser, sPassword:=UAVars.sPass); UAClient: UA.Client := ( itfAsyncProperty:= UAAsyncProp, //sClientName:= 'MyOPC UA client name', //default: ‘CODESYS OPC UA Client’ sURL:= UAVars.sURL, sSession:= UAVars.sSession, itfPolicy:= UAPolicy, itfAuth:=UAAuth, udiTimeout:= 100000 //,itfNamespaceArray:= UAVars.itfNamespaceArray //optional use ); ----------------------------------------------------------------------------------------------------------------------- Please let me know if any additional information required. Thank you...
Last updated: 2026-05-07

Post by manuknecht on XY Chart causes extremely long cycle in Visu Task ^{CODESYS Forge} ^talk ^(Post)
I am using the visualization element "Cartesian XY Chart" in a visualization template within a library to display recorded position values. I managed to configure the chart as desired and it displays the values like it should. A problem occurs when clicking on the chart to move the cursor, zoom or pan. Upon clicking the visualization element for the first time, the task in which the visualization is run spikes to a cycle time of around 5'000 to 15'000 ms (the configured cycle time is 100 ms). Sometimes this even completely crashes the web-visualization. After this very long cycle, the visu task normalizes again and the chart can be interacted with as usual. Another spike in cycle time occurs once the visualization is switched to a frame that does not contain the chart. I did reduce the data array to only a few values and tried changing the update behaviour of the chart, but it did not change the problems I am facing. Did anyone experience a similar issue or even has a solution for this?
Last updated: 2026-06-16

Post by clesio on CAA.File.Write – Unexpected characters when writing a CSV file ^{CODESYS Forge} ^talk ^(Post)
Hello everyone, I am trying to create a routine in CODESYS to export a report to a CSV file using the CAA.File library. The file is created successfully, but I am getting some unexpected/unknown characters in the generated CSV. The problem seems to be related to the SIZEOF() function. I am using it for the szSize parameter of File.Write, as recommended in the CODESYS documentation. However, when I use SIZEOF(), the CSV contains extra characters and parts of previous strings. I also tried using LEN(), but in my application the file is created empty, even though the string and the calculated length appear to be correct. Here is the relevant part of my code: PROGRAM Relatorio VAR // Bool b_Executa_fb_Cria_Arquivo : BOOL; b_Executa_fb_Fecha_Arquivo : BOOL; b_Escreve_dados : BOOL; b_Erro_fb_Escreve : BOOL; //STR s_Nome_Arquivo : STRING; s_Palavra : STRING; s_Palavra_Anterior : STRING; s_Data_Atualizada_Formatada : STRING; s_Dia : STRING; s_Mes : STRING; s_Ano : STRING; s_Hora_Atualizada_Formatada : STRING; s_Hora : STRING; s_Minu : STRING; s_Segu : STRING; //INT i_modo_fb_Cria_Arquivo : INT; i_ErroID_fb_Escreve : INT; //UINT i_Tamanho_Palavra : UINT; // Blocos de Funcao fb_Cria_Arquivo : FILE.Open; fb_Fecha_Arquivo : FILE.Close; fb_Escreve : FILE.Write; // DATA E HORA sc_DataTime : SysTimeRtc.RTS_SYSTIMEDATE; // STRUCT = sc uidResultRtcGet : UDINT; //stGetDate : SysTimeRtc.RTS_SYSTIMEDATE; uidResultConvertToDate : UDINT; uidResult : RTS_IEC_RESULT; END_VAR VAR_INPUT //BOOL b_SET_Executa_fb_Cria_Arquivo : BOOL; b_RES_Executa_fb_Cria_Arquivo : BOOL; b_Executa_fb_Escrita : BOOL; // INT i_Linhas_Cabecalho : INT; i_Linhas_Cabecalho_Anterior : INT; END_VAR // Para Testes s_Nome_Arquivo := 'relatorio/Teste1M.CSV'; i_modo_fb_Cria_Arquivo := 0; // TRATAMENTO DE DATOS DATA e HORA uidResultRtcGet := SysTimeRtcGet(uidResult); uidResultConvertToDate := SysTimeRtcConvertUtcToDate(dwTimestampUtc := uidResultRtcGet, pDate := sc_DataTime); // FORMATA DATA EM UMA STRING s_Dia := UINT_TO_STRING(sc_DataTime.wDay); s_Mes := UINT_TO_STRING(sc_DataTime.wMonth); s_Ano := UINT_TO_STRING(sc_DataTime.wYear); s_Data_Atualizada_Formatada := CONCAT(s_Dia, CONCAT('/', CONCAT(s_Mes, CONCAT('/', s_Ano)))); // FORMATA HORA EM UMA STRING s_Hora := UINT_TO_STRING(sc_DataTime.wHour); s_Minu := UINT_TO_STRING(sc_DataTime.wMinute); s_Segu := UINT_TO_STRING(sc_DataTime.wSecond); s_Hora_Atualizada_Formatada := CONCAT(s_Hora, CONCAT(':', CONCAT(s_Minu, CONCAT(':', s_Segu)))); // ABRE e CRIA ARQUIVO IF (b_SET_Executa_fb_Cria_Arquivo OR b_Executa_fb_Cria_Arquivo) AND NOT(b_RES_Executa_fb_Cria_Arquivo) THEN b_Executa_fb_Cria_Arquivo := TRUE; ELSE b_Executa_fb_Cria_Arquivo := FALSE; END_IF fb_Cria_Arquivo( xExecute := b_Executa_fb_Cria_Arquivo, sFileName := s_Nome_Arquivo, eFileMode := i_modo_fb_Cria_Arquivo, xExclusive := FALSE, ); //i_Tamanho_Palavra := SizeOf(s_Palavra); // ESCREVE NO ARQUIVO fb_Escreve( xExecute := b_Executa_fb_Escrita, hFile := fb_Cria_arquivo.hFile, szSize := SIZEOF(s_Palavra), pBuffer := ADR(s_palavra) ); // FECHA ARQUIVO fb_Fecha_Arquivo( xExecute := b_Executa_fb_Fecha_Arquivo, hFile := fb_Cria_arquivo.hFile ); IF Criacao_Edicao_Arquivos.b_Escreve_Cabecalho THEN CASE i_Linhas_Cabecalho OF 1 : s_palavra := 'ESTERILIZADOR'; 2: s_palavra := 'MAQ4; $R$L'; 3: s_palavra := CONCAT(CONCAT('CLIENTE: ',GVL.sReceitaAtual), '$R$L'); 4: s_palavra := CONCAT(CONCAT('NUMERO LOTE: ',DINT_TO_STRING(GVL.Lote)), '$R$L'); 5: s_palavra := CONCAT(CONCAT('OPERADOR: ', DINT_TO_STRING(GVL.Operador)), '$R$L'); 6: s_palavra := CONCAT(CONCAT('DATA: ', s_Data_Atualizada_Formatada), '$R$L'); 7: s_palavra := CONCAT(CONCAT('HORA: ', s_Hora_Atualizada_Formatada), '$R$L'); 8: s_palavra := '$R$L'; 9: s_palavra := 'PARAMETROS AJUSTADOS $R$L'; 10: s_palavra := CONCAT('TEMPO PRE COND.: ', CONCAT(INT_TO_STRING(GVL.rc_T_PreCondicionamento), ' min $R$L')); 11: s_palavra := CONCAT('PULSOS INERTIZACAO 1: ', CONCAT(INT_TO_STRING(GVL.rc_PulsosInertizacao_1), ' PULSOS $R$L')); 12: s_palavra := CONCAT('PULSOS INERTIZACAO 2: ', CONCAT(INT_TO_STRING(GVL.rc_PulsosInertizacao_2), ' PULSOS $R$L')); 13: s_palavra := CONCAT('PULSOS AERACAO: ', CONCAT(INT_TO_STRING(GVL.rc_PulsosAeracao_2), ' PULSOS $R$L')); 14: s_palavra := CONCAT('PRESSAO DE VACUO 1: ', CONCAT(REAL_TO_STRING(GVL.rc_PV1_max), ' bar $R$L')); 15: s_palavra := CONCAT('PRESSAO DE VACUO 2: ', CONCAT(REAL_TO_STRING(GVL.rc_PV2), ' bar $R$L')); 16: s_palavra := CONCAT('PRESSAO INERTIZACAO 1: ', CONCAT(REAL_TO_STRING(GVL.rc_PN1), ' bar $R$L')); 17: s_palavra := CONCAT('PRESSAO INERTIZACAO 2: ', CONCAT(REAL_TO_STRING(GVL.rc_PN2), ' bar $R$L')); 18: s_palavra := CONCAT('PRESSAO AERACAO: ', CONCAT(REAL_TO_STRING(GVL.rc_PAR), ' bar $R$L')); 19: s_palavra := CONCAT('PRESSAO ETO: ', CONCAT(REAL_TO_STRING(GVL.rc_PressaoETO), ' bar $R$L')); 20: s_palavra := CONCAT('PRESSAO Compl.: ', CONCAT(REAL_TO_STRING(GVL.rc_PressaoETO_2), ' bar $R$L')); 21: s_palavra := CONCAT('MASSA ETO: ', CONCAT(REAL_TO_STRING(GVL.rc_QuantidadeETO), ' Kg $R$L')); 22: s_palavra := CONCAT('TEMPO PRE COND. Vacuo/Vapor: ', CONCAT(INT_TO_STRING(GVL.rc_T_Vapor_1), ' min $R$L')); 23: s_palavra := CONCAT('SET-POINT: ', CONCAT(REAL_TO_STRING(GVL.ihm_SPTemperatura), ' °C $R$L')); 24: s_palavra := CONCAT('TEMPO ESTERILIZACAO: ', CONCAT(INT_TO_STRING(GVL.rc_TempoEsterilizacao), ' min $R$L')); 25: s_palavra := CONCAT('TEMPO PARADA: ', CONCAT(INT_TO_STRING(GVL.rc_T_PressaoParada), ' min $R$L')); 26: s_palavra := CONCAT('UMIDADE: ', CONCAT(REAL_TO_STRING(GVL.rc_UmidadeRelativa), ' % $R$L')); 27: s_palavra := '$R$L'; END_CASE END_IF Note: The code I am attaching does not include the execution/sequence management of the function blocks. I have omitted this part to keep the example focused on the CSV writing routine. The function blocks are triggered and managed by a separate state machine. I am not sure what the correct approach is in this case, especially since the official documentation recommends using SIZEOF() for szSize. I will attach my code and a screenshot of the generated CSV showing the issue. Has anyone experienced something similar or could suggest the correct way to write a changing STRING to a CSV file using CAA.File.Write?
Last updated: 2026-09-08

Post by ilya-vah on Table element issues ^{CODESYS Forge} ^talk ^(Post)
Hello, First post here. I would like to clarify whether the following behavior is known or if it is a bugs. Issue 1 — First row not displayed when using Maximum array index with 1-based arrays Description: When displaying data from an array that is indexed starting from 1 (e.g., ARRAY[1..N]), and the number of displayed rows is limited using the Maximum array index property, the first row of the array is not shown in the visualization. Steps to reproduce: Create an array indexed from 1 (e.g., ARRAY[1..N]). Bind the array to a Table element. Limit the number of displayed rows using the Maximum array index property. Run the visualization. Actual result: The first array element (index 1) is not displayed in the table. Issue 2 — Tooltip string placeholder cannot be bound to string variable from array Description: It is not possible to use a string placeholder in the tooltip that is bound to a string variable from the array. Steps to reproduce: Use a table bound to an array containing string variables. Configure a tooltip using a string placeholder referencing a string field from the array. Run the visualization. Actual result: Tooltip doesn't show any text. A test project demonstrating both issues is attached. Thank you for your time and support.
Last updated: 2026-02-16

Post by timvh on USB Game Controller with Raspberry Pi ^{CODESYS Forge} ^talk ^(Post)
I'm not sure it will work, but you could try it with the CmpCharDevice library. You could create a function block that looks something like this: As input for the filename, you have to use your Linux device, e.g.: '/dev/input/event0' '/dev/input/by-path/platform-button@23-event' Off course you must also pass the pointer to the memory where the data can be written to and the size (count in number of bytes) of the buffer. FUNCTION_BLOCK FB_CharDevice VAR_INPUT szFilename: STRING; pbyBuffer : POINTER TO BYTE; udCount : UDINT; END_VAR VAR_OUTPUT iState : INT := 0; nrBytesRead : DINT; END_VAR VAR xInit : BOOL := TRUE; dFlags: DINT := CmpCharDevice.ACCESS_MODE.O_RDONLY + DINT#4000; // see details for flags: http://linux.die.net/man/2/open, + DINT#4000 is for non-blocking hDevice: CmpCharDevice.CmpCharDevice_Implementation.RTS_IEC_HANDLE := -1; Result : CmpCharDevice.CmpCharDevice_Implementation.RTS_IEC_RESULT; END_VAR IF xInit THEN hDevice := CmpCharDevice.CDOpen(szFilename, dFlags ,Result); // if it would not succeed, the result is -1 (Invalid handle) IF hDevice <> 16#FFFFFFFF AND Result = 0 THEN iState := 5; END_IF xInit := FALSE; END_IF IF iState = 5 THEN nrBytesRead := CmpCharDevice.CDRead(hDevice, pbyBuffer, udCount, Result); ELSE nrBytesRead := 0; END_IF Make sure you close the connection properly, maybe by overwriting the default FB_Exit method of the FB: // Clean up device IF hDevice <> 16#FFFFFFFF THEN __TRY CmpCharDevice.CDClose(hDevice,Result); __CATCH ; __ENDTRY iState := 0; END_IF
Last updated: 2026-05-01

Post by manuknecht on Opening a Dialog on a specific Client from ST ^{CODESYS Forge} ^talk ^(Post)
I managed to find a solution that seems to work reliably. As the VU.Globals.CurrentClient-filter accesses the CURRENTCLIENTID or at least a similar, internal variable it can only be used if called from a certain client (e.g. from a button in a visualization). My solution works by implementing a new client filter that compares the client ID of all clients to the ID of the last client that was used. The variable containing the data of the last client is defined as: G_LastClient : VU.IVisualizationClient; // Copy of last client that detected click This last client is then updated every time a button is pressed using the Execute ST-Code input configuration of the button: G_LastClient := VU.PublicVariables.Clients.Current; Next, I created a function block that implements the client filter interface as so: FUNCTION_BLOCK FB_LastClientFilter IMPLEMENTS VU.IVisualizationClientFilter VAR_INPUT END_VAR VAR_OUTPUT END_VAR VAR END_VAR Then i added a method to the FB called IsAccepted which is used to filter out the client. When creating the method, it should automatically be filled with the according variable declaration, as it is defined in the interface: (* For every client can be desided, if it is accepted. ``TRUE``: Client is accepted*) METHOD IsAccepted : BOOL VAR_INPUT (* The client, to check*) itfClient : VU.IVisualizationClient; END_VAR Now the client can be compared to the last used client as such: // check if clientID corresponds to clientID of last recorderd client IF itfCLient.ClientId = G_LastClient.ClientId THEN IsAccepted := TRUE; ELSE IsAccepted := FALSE; END_IF To make use of this custom client filter, initialize a variable with the client filter: LastClient : FB_LastClientFilter; // Client filter to find last used client Then use this client filter when opening or closing a dialog from ST: fbOpenMyDialog(itfClientFilter:=LastClient,xExecute:=TRUE,sDialogName:='VIS_MyDialog_DLG');
Last updated: 2023-09-27

Post by rajatdas2005 on Codesys Virtual control SL ^{CODESYS Forge} ^talk ^(Post)
Dear All, This is regarding Codesys Virtual control SL demo version. I am facing one issue. First I will describe the steps what I have followed till now. 1. In a PC I have Windows OS. Here Codesys IDE is installed, and also using the installer option of IDE I have also installed Codesys Virtual control SL. 2. A edge-gateway is also running in the same windows PC as local host. 3. Next I have a seperate PC with Ubuntu OS with docker installed. This machine is in the same network. 4. Now I have created a project in Windows machine using device "Codesys Virtual control SL". 5. In the Ubuntu machine I am running the Codesys Virtual control SL as docker and it is using the ubuntu machine network only. 6. Next using the localhost edge-gateway when I am searching the virtual control SL docker it is able to detect it. (screenshot attached) 7. But after creating the creadentials it is telling No Device is responding. 8. I have also checked the wireshark logs and able to see that in destination port 11740 data is coming. 9. From windows PC telnet ip 11740 is also working. 10. Ping is also working ===========================================LOGS ========================= sudo ss -tlnp | grep -E "(443|1217|4840|8080|11740)" LISTEN 0 10 10.135.114.142:4840 0.0.0.0: users:(("codesyscontrol.",pid=41864,fd=21)) LISTEN 0 10 172.18.0.1:4840 0.0.0.0: users:(("codesyscontrol.",pid=41864,fd=24)) LISTEN 0 10 172.17.0.1:4840 0.0.0.0: users:(("codesyscontrol.",pid=41864,fd=23)) LISTEN 0 10 127.0.0.1:4840 0.0.0.0: users:(("codesyscontrol.",pid=41864,fd=26)) LISTEN 0 10 192.168.122.1:4840 0.0.0.0: users:(("codesyscontrol.",pid=41864,fd=22)) LISTEN 0 5 0.0.0.0:11740 0.0.0.0: users:(("codesyscontrol.",pid=41864,fd=20)) LISTEN 0 128 0.0.0.0:8080 0.0.0.0: users:(("python3",pid=1280,fd=4)) LISTEN 0 10 172.19.0.1:4840 0.0.0.0: users:(("codesyscontrol.",pid=41864,fd=25))
Last updated: 2025-08-06

Post by artplc on 3.5 P20 hangs - no response ^{CODESYS Forge} ^talk ^(Post)
Subject: Solution: CODESYS Freezes Linked to Large Symbol Configuration (OPC UA) Hello everyone, I was experiencing the same problem as many here: CODESYS (v3.5 SP20+) freezing during compilation and download, especially on projects that use OPC UA for SCADA. The only workaround was to run Build > Clean all before every download. I believe I have found the root cause and a permanent solution. The Problem: The issue is directly related to a large Symbol Configuration. In my project, I only need about 700 tags for OPC UA, but the Symbol Configuration list was showing over 250,000 tags. This is because it automatically includes all variables from Global Variable Lists (GVLs) and other memory areas. When any static variable is changed, the IDE tries to rebuild this enormous list, causing it to freeze for several minutes. The Solution: Instead of letting CODESYS export every variable by default, you can use a pragma to tell it which variables or GVLs to exclude from the symbol export process. Place the following pragma at the top of any GVL or data structure that you do not want to be part of the symbol configuration: 1 {attribute 'symbol' := 'none'} 2 VAR_GLOBAL 3 // All variables in this GVL will now be excluded from the 4 // Symbol Configuration by default. 5 InternalVariable1 : INT; 6 InternalVariable2 : BOOL; 7 END_VAR After adding this pragma to all the GVLs that were not needed for OPC UA, the number of tags in my Symbol Configuration dropped to the correct amount. The compilation and download process is now fast again, with no freezing. This method is much more efficient than manually managing the symbol list in the editor. I hope this helps others who are facing this frustrating issue. Best regards.
Last updated: 2025-08-10

Post by john-robinson on Limiting Memory Access of an Array to Within its Bounds ^{CODESYS Forge} ^talk ^(Post)
Recently we had an issue regarding some simple code to calculate a rolling average. The code indexes from zero to 199 to properly store the current input into a circular buffer which then allows us to calculate a rolling average: VAR input_5s : REAL; outs_arr : ARRAY[0..199] OF REAL; i : USINT := 0; END_VAR ___ //this code runs every five seconds, calculating a rolling average outs_arr[i] := input_5s; i := i + 1; output := OSCAT_BASIC.ARRAY_AVG(ADR(outs_arr), SIZEOF(outs_arr)); IF i >= SIZEOF(outs_arr) THEN i := 0; END_IF There is a simple bug in this code where the index will be set to 0 when it has surpassed the length of the array in bytes (800 in this case) rather than larger than the number of reals in the array (200). The solution here is simple, replacing i >= SIZEOF(outs_arr) with i >= SIZEOF(outs_arr)/SIZEOF(outs_arr[0]). In this example when the index increased to 201 and the line outs_arr[201] := input_5s was called, codesys arbitrarily wrote to the address in memory that is where outs_arr[201] would be if the array was that long. I would like to find a way to wrap the codesys array inside of a wrapper class that checks if an input is within the bounds of an array before writing to that value. I know how I would implement that for a specific array, I could create a method or class that takes an input of an array of variable length, ie. ARRAY[*] OF REAL, but I don't know how to make this for any data type. I am wondering if anyone has ever done anything similar to this, or has any better suggestions to ensure that none of the programmers on this application accidentally create code that can arbitrarily write to other locations in memory.
Last updated: 2024-03-05

Post by duvanmoreno24 on Modbus writing on value change ^{CODESYS Forge} ^talk ^(Post)
Hi all, I want to know if someone has an idea of how I can write on value change in Modbus Codesys. I have a Wago PLC and I was used to work with E-cockpit which it was quite easy to do that without the necessity to trigger any value when there was a change in the variable ( I will put how easy is ). how you can see just changing the trigger in "On value Change" will do that channel writing automatically when It detects a change in those arrays. On the other hand, in Codesys if I enable the rising edge in Codesys It ask me to put a bool variable and if triggers is going to write that value. That is making me that I have to create a function or a logic to detect the change, the problem I have is that doing that is very tedious. I first approach I got it was to create a Function who returns a bool when the value change, but I tried to keep the old value but what is happening is that in Functions all the data is erased every cycle so I can not keep any Old value. so in the Main program the trigger is going to be TRUE all the time due, the old value is cero every cycle. The second approach I got it was using a function Block (POU_1) and it works but I dont want to instance that function for every Channel or value that I want to check if the value change, Basically if I have 200 values to write trhough modbus I have to create 200 instances of that function which I think it is not practicall at all. It should be a better way to implement this as e-Cockpit from Wago Does. However, I haven't been able to know how.
Last updated: 2024-03-26

Post by mariussandu on OPC-UA ^{CODESYS Forge} ^talk ^(Post)
Hello, I am experiencing an intermittent OPC UA server issue on CODESYS Control for Raspberry Pi SL 4.21.0.0. Runtime information: codesyscontrol 4.21.0.0 Raspberry Pi 4 Model B Rev 1.1 - 4Gb OPC UA Server: CmpOPCUAServer 3.5.22.x Server IP: 192.168.0.110 OPC UA endpoint: opc.tcp://192.168.0.110:4840 The main OPC UA client is Node-RED running on 192.168.0.111. This has an active subscription with some tags and also some write functions active. The system normally works correctly for a period, but at some time the OPC UA communication stopped. Node-RED started reconnecting continuously but could not reconnect. I also tried connecting using UaExpert, but UaExpert returned: BadTimeout At the same time, the PLC application itself was still running. Before restarting CODESYS, I captured the TCP connections. The OPC UA server was still listening: tcp 11 0 192.168.0.110:4840 0.0.0.0:* LISTEN However, there were many connections from the Node-RED client stuck in CLOSE_WAIT: 192.168.0.110:4840 192.168.0.111:45008 CLOSE_WAIT 192.168.0.110:4840 192.168.0.111:53678 CLOSE_WAIT 192.168.0.110:4840 192.168.0.111:44032 CLOSE_WAIT 192.168.0.110:4840 192.168.0.111:36612 CLOSE_WAIT 192.168.0.110:4840 192.168.0.111:45012 CLOSE_WAIT 192.168.0.110:4840 192.168.0.111:36592 CLOSE_WAIT ... Some of these sockets also had data remaining in Recv-Q, for example: Recv-Q = 61 Recv-Q = 121 There were roughly 15–20 OPC UA connections in CLOSE_WAIT. Restarting only the CODESYS runtime immediately restored OPC UA communication. After restart: LISTEN 0 10 192.168.0.110:4840 and both Node-RED and UaExpert can connect normally again. There are no obvious OPC UA errors during startup or in log. On RPI 2 I had a memory leak regarding OPCUA so I had to upgrade to RPI4. What can I do in this case? Thank you!
Last updated: 2026-08-26

Post by brouwyka on JSONByteArrayWriter string result incorrect order ^{CODESYS Forge} ^talk ^(Post)
Hello everybody! We are currently working on implementing a call to an API that tracks data sent to it through a JSON body. Versions: CODESYS V3.5 SP19 Patch 7 using IIOT Libraries SL license, specifically JSON Utilities SL version 1.13.0.0. For simplicity, let's say we want to construct the following JSON body for our request (simplified to just 1 key-value pair in each of the array objects to keep things shorter, but we'd have multiple fields in each in reality): { "id": "machine_1", "readings": [ { "temp_mid": 153.8 }, { "temp_mid": 98.3 } ], "status": "RUNNING" } However, our "readings" data is added over time, not in creation, so calls to the builder would be somewhat out of order. In a simplified manner, our calls would look like this: jsonBuilder(pJsonData := JsonData, diRootObj => rootJsonIndex); // rootJsonIndex = 0. // Set "id" at root JSON object. wsValue := "machine_1"; jsonBuilder.SetKeyWithValue("id", wsValue, diParentIndex := rootJsonIndex); // JSONData KEY: diParentIndex = 0 & diIndex = 1, VALUE: diParentIndex = 1 & diIndex = 2. // ... Time passes, we get our first reading to add ... // The "readings" array does not exist yet, so we make it first at root JSON object before adding our first reading. readingsJsonArrayIndex := jsonBuilder.SetKeyWithArray("readings", diParentIndex := rootJsonIndex); // JSONData KEY: diParentIndex = 0 & diIndex = 3, VALUE: diParentIndex = 3 & diIndex = 4. // Then add the first reading, for which we first have to make an object. readingsJsonArrayObjectIndex := jsonBuilder.SetObject(diParentIndex := readingsJsonArrayIndex); // JSONData OBJECT: diParentIndex = 4 & diIndex = 5. // And then we add the field(s) in the object for the first reading. // NOTE the use of `readingsJsonArrayObjectIndex` so we set the field(s) in the first object in the array. rValue := 153.8; jsonBuilder.SetKeyWithValue("temp_mid", wsValue, diParentIndex := readingsJsonArrayObjectIndex); // JSONData KEY: diParentIndex = 5 & diIndex = 6, VALUE: diParentIndex = 6 & diIndex = 7. // ... Time passes, we want to add another root-JSON-level field ... // Set "status" at root JSON object. wsValue := "RUNNING"; jsonBuilder.SetKeyWithValue("status", wsValue, diParentIndex := rootJsonIndex); // JSONData KEY: diParentIndex = 0 & diIndex = 8, VALUE: diParentIndex = 8 & diIndex = 9. // ... Time passes, we want to add a second reading ... // "readings" array exists, so add the second reading, but first we have to make another object. // NOTE the re-use of the earlier stored `readingsJsonArrayIndex`, so we add the new object to that previously created array. readingsJsonArrayObjectIndex := jsonBuilder.SetObject(diParentIndex := readingsJsonArrayIndex); // JSONData OBJECT: diParentIndex = 4 & diIndex = 10. // And then we add the field(s) in the object for the first reading. // NOTE the use of `readingsJsonArrayObjectIndex` so we set the field(s) in the SECOND(, new) object in the array. rValue := 98.3; jsonBuilder.SetKeyWithValue("temp_mid", wsValue, diParentIndex := rootJsonIndex); // JSONData KEY: diParentIndex = 10 & diIndex = 11, VALUE: diParentIndex = 11 & diIndex = 12. // ... Finally, we want to send to the API, so we must convert the builder to data the client accepts as a body ... xTestWriteToJsonArray := TRUE; jsonArrayWriter( xExecute := xTestWriteToJsonArray, pwData := ADR(jsonDataString), udiSize := SIZEOF(jsonDataString), jsonData := JsonData^ ); IF jsonArrayWriter.xDone THEN // The writer was successful, the `jsonDataString` VAR should now contain a WString copy of the JSON object from the builder. xTestWriteToJsonArray := FALSE; END_IF We see that the JsonData STRUCT is correctly organised (in terms of the diParentIndex & diIndex set by it for each JsonElement) as we expect, as outlined in my comments in the simplified code above. However, as soon as we pass it to the jsonArrayWriter (which is a JSON.JSONByteArrayWriter), the resulting jsonDataString does not match our expectations, instead coming out like this: { "id": "machine_1", "readings": [ { "temp_mid": 153.8 } ] } { "temp_mid": 98.3 } "status": "RUNNING" The behaviour of the JSONByteArrayWriter thus seems to be the problem here. It does not seem to correctly process the children of JsonElements that are ARRAYs when additions to them are done broken up by additions to the lower level JSON OBJECT they are a part of. We have confirmed this by changing the order of the calls in our example to add both readings before adding the "status", in which case we get our expected outcome. However, in reality this is not possible for us - additions to any of the JSON's objects, arrays or array objects may happen at any time after other fields elsewhere in the JSON have been added. Does anyone know a way around this, a fix, or knows a solution we simply have not found? This same phenomenon was also noted on this forum by user @ryusoup at the end of 2023 (https://forge.codesys.com/forge/talk/Engineering/thread/c45929e2f1/#e27f) and user @mtho in early 2024 (https://forge.codesys.com/forge/talk/Engineering/thread/cd1bb450db/#1292) but both topics received no activity beyond both users' opening posts. Looking through the release notes of all the versions of the JSON Utilities SL library, I also did not see any remarks on resolutions of bugs in this vain. Thanks in advance for the assistance!
Last updated: 2026-06-10

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