Post by cihangur on OpC UA server on Raspberry Pi 64 SL runtime ^{CODESYS Forge talk (Post)}
After my tests, I noticed two issues. 1- WinCC disconnects the connection after receiving the GetEndPointResponse message from CoDeSys. (I found it with UAExpert and Wireshark.) 2- It establishes a connection despite waiting for a while on the network with DNS. As a result of this information: I solved the problem by adding the line "193.193.193.150 t9pac" to the C:\Windows\System32\Drivers\etc\hosts file and making Windows accept messages coming from the IP number 193.193.193.150 as coming from t9pac. (t9pac is the name of my PLC running CoDeSys.) If there is a setting that will allow CoDeSys OPC UA to respond to GetEndPointRequest with its IP address, this problem will not occur.
Last updated: 2024-12-12

Post by struccc on Problem Reading Registers via Modbus from non Codesys device ^{CODESYS Forge talk (Post)}
Hi, Might be a good idea first to try out the connection and the device with some handy software, like Modbus Poll. There you can see better, what's really going on... - Is it really connected? - What error code does it return? - Can it read from the register address? - Maybe try Input registers and Holding Registers - can make a difference - Sometimes register addresses are messed up: shifted +-1 (mixing of 2 standards) - Sometimes register addresses start with offset 30000, 40000 ... - Are you using the right protocol? - Is it RTU or TCP? Maybe ASCII? - Can even have a look at the data packets, etc... All this is easier to figure out first with some modbus utility... and then to set it up in CODESYS should not be an issue. P.
Last updated: 2025-03-09

Post by alexgooi on Licensing info not available. ^{CODESYS Forge talk (Post)}
Dear Forum I have the following config: Codesys_IDE 3.5.20 Codesys_Virtual_Control 4.13 Codesys_License_Server 4.13 I know these are not the newest versions, but in my mind these should work. I have the same problem here. I have the license server installed on the host, and in the docker container(Codesys virtual control) I'm able to ping the license server. In the /conf/codesyscontrol/CODESYSControl_User.cfg I have added the following config: [CmpCodeMeter] EnableNetLicenses=1 LicenseServer.1="ip address of the host" I have tried it via the wbm web-page. I can create new license containers over there, but still no luck. I also have tried to run the docker container with the -s "server_IP" command. I have searched for some tutorial's but I couldn't find it. If anyone has some clue or can give me a push in the right direction it would be very very welcome!
Last updated: 2025-09-29

Post by dhumphries on Codesys device configuration ^{CODESYS Forge talk (Post)}
First make sure the programming laptop and HMI are both on the same subnet. For example if the IP address of the HMI is 192.168.1.125 with a subnet mask 255.255.255.0 set your laptop IP to 192.168.1.120 with a subnet mask of 255.255.255.0. Make sure the cables are fully connected (the ethernet port on my programming laptop will click once but the cable is not fully seated.) Make sure the HMI is powered on, try pinging the device from a command prompt, if you can't ping the HMI there is a network issue that has to be resolved first.
Last updated: 2023-12-30

Post by nmcc on How to address visualization change with button press... ^{CODESYS Forge talk (Post)}
Hello all, I am extremely new to Codesys and to programming with these languages in general. I have an HMI panel with 8 physical buttons to the right side of it. I am trying to have these set to change the visualization to a specific screen which I have designed 8 of. I currently have "use CurrentVisu" enabled in the visualization manager. I also have input blocks with all of the buttons being directed to output blocks which I want to have as the switcher for the visualization. Picture is attached for what I have currently. This could be the wrong approach to this issue. Any help is much appreciated.
Last updated: 2024-02-13

Post by nmcc on How to address visualization change with button press... ^{CODESYS Forge talk (Post)}
Hello all, I am extremely new to Codesys and to programming with these languages in general. I have an HMI panel with 8 physical buttons to the right side of it. I am trying to have these set to change the visualization to a specific screen which I have designed 8 of. I currently have "use CurrentVisu" enabled in the visualization manager. I also have input blocks with all of the buttons being directed to output blocks which I want to have as the switcher for the visualization. Picture is attached for what I have currently. This could be the wrong approach to this issue. Any help is much appreciated.
Last updated: 2024-02-13

Post by valec on Connect local Asem HMI runtime to local Codesys Control Win V3 x64 ^{CODESYS Forge talk (Post)}
I have a project made on a PL700 PLC with Codesys and an Asem Premium HMI panel. I don't have access to the physical PLC right now, so I'm trying to use Codesys Control Win V3 x64. I created the application and loaded "Codesys Control Win V3 x64" without errors, then I activate "Start PLC" from the tray. Asem cannot connect. I tried to use "localhost" or the local IP address and it doesn't work (it's the "CoDeSys Soft PLC Communication Driver"). I need to connect my local Asem runtime to a virtual Codesys application on my PC. How can I do it?
Last updated: 2024-03-26

Post by sbrauns on Codemeter log error: API Error 200 (ENTRY NOT FOUND) occurred! ^{CODESYS Forge talk (Post)}
Hi, I am using Codesyscontrol for linux 4.11 with an USB dongle with license. The log file from codemeter shows a constant error message which repeats every minute: Entry (6000437:8755) not found - Event WB0200 (ENTRY NOT FOUND), Request IP-Address local(IPV4) with UserLimit API Error 200 (ENTRY NOT FOUND) occurred! The log file from Codesyscontrol itself shows runtime licensed and I experience no other issues. But I am still concerned about the error message in the log file. Does anybody know what this is and how to fix it? thanks
Last updated: 2024-05-08

Post by jroddball79 on PM556-TP-ETH — How to change IP address without overwriting the PLC program? ^{CODESYS Forge talk (Post)}
Still looking for a solution. I have gathered more information that might help: Device: ABB AC500 PM556-TP-ETH Firmware version: 2.4.2.14993 (dated 2014) Open ports confirmed: 502 (Modbus TCP), 1200 and 1201 (CODESYS runtime). SSH (22) and HTTP (80) are not reachable. No SD card in the PLC. I can connect via Automation Builder using the current IP and Online Login works, but I have no original source project available. Automation Builder requires a full PLC download to apply IP changes, which we want to avoid as it would overwrite the running program. Any guidance on how to change the IP without a full download would be greatly appreciated. I am also open to solutions using third party tools, DCP protocol, or scripts. Thank you
Last updated: 2026-05-22

Post by husarz17 on How change Unity-ID in TCP Modbus Slave ^{CODESYS Forge talk (Post)}
My codesys is 3.5.21.30. I am using function ModbusServer from library ModbusTCP_Slave. The reason is that I need share 9000 Holding registers. By standard configuration it is only 4096. fbMbTcpDevice: ModbusTCP_Slave.ModbusServer; fbMbTcpDevice( wPort := 502, pInputData := ADR(awInputReg), pOutputData := ADR(awHoldingReg), uiInputDataSize := 10, uiOutputDataSize := 9000, xEnable := TRUE, tTimeout := 10000, InterfaceName := "eth0", xBusy => xBusy, xError => xError, byClientConnections => byConnections ); Ethernet port is cofigured: Network interface: eth0 IP address: 10.10.22.55 Subnet maskL 255.255.255.0 Default gateway: 0.0.0.0 And it only works when I am reading registers with ID 255 by Modbus Poll. Any other IDs don't work. The actual TCP client device try to read registers with ID 1 and I can't change it... Thanks in advance for your help!
Last updated: 2026-04-01

Post by jroddball79 on PM556-TP-ETH — How to change IP address without overwriting the PLC program? ^{CODESYS Forge talk (Post)}
We have checked open ports. SSH (22) and HTTP (80) are not reachable. The only open ports are: 502 (Modbus TCP — used for lighting control) 1200 (CODESYS runtime) 1201 (CODESYS runtime) We can connect via Automation Builder using the current IP, but we don't have the original project source — only an empty project. This is why we are afraid of doing a full download, as it would overwrite the running application. Is there any way to change the IP through the CODESYS runtime protocol on ports 1200/1201 without affecting the running program?"
Last updated: 2026-05-20

Post by gorditron on I2C Communication with ^{CODESYS Forge talk (Post)}
Hello, I have problems with the I2C communication to an ADS7828 AD converter. I don't get any value back from the chip. I use a Kontron chip (ARM 32SC) with Linux as the operating system. I also use the CmpCharDevice library. ADS7828 parameters Address: A1 = 0 / A0 = 0 = SD = 1 = Single End C2 = 0 / C1= 0 / C0= 0 / Channel 0 PD1 = Internal Reference and PD0 = AD Converter ON Here is my code: VAR b_i2cAdr : BYTE := 16#48; (* Standard I2C-Adresse des ADS7828 *) x_Init: BOOL;(* Flag für die Initialisierung *) b_config_byte: BYTE;(* Konfigurationsbyte für den ADS7828 *) ab_cmd_buffer : ARRAY [0..0] OF BYTE; (* Buffer für den Befehl *) ab_data_buffer : ARRAY [0..1] OF BYTE; (* Buffer für die empfangenen Daten *) ui_adc_value_1 : UINT; (* Ausgelesener ADC-Wert *) I2C_Handle: RTS_IEC_HANDLE; (* Handle für das I2C-Device *) di_result_open: DINT;(* Ergebnis der Funktionsaufrufe *) di_result_adr: DINT;(* Ergebnis der Funktionsaufrufe *) di_result_wr_cmd: DINT;(* Ergebnis der Funktionsaufrufe *) di_result_rd_cmd: DINT;(* Ergebnis der Funktionsaufrufe *) di_result_close: DINT;(* Ergebnis der Funktionsaufrufe *) END_VAR //*** Init from the I2C communication port *** IF NOT x_Init THEN I2C_Handle := CDOpen(szFile:= '/dev/i2c-0', dFlags:= O_RDWR, pResult:= ADR(di_result_open)); //* I2C opening * //*** set of the I2C address *** CDIoctl(hFile:=I2C_Handle , dRequest:=1795 , dParameter:=b_i2cAdr , pResult:=ADR(di_result_adr) ); x_Init := TRUE; END_IF (* Hauptlogik *) IF I2C_Handle <> 0 THEN (* Konfigurationsbyte setzen: Single-Ended Kanal 0, interne Referenz *) b_config_byte := 16#8C; (* 10001100b: AIN0, interne Referenz, Single-Ended *) ab_cmd_buffer[0] := b_config_byte; (* Schreiboperation zum Konfigurieren des Chips *) CDWrite(hFile:= I2C_Handle, pbyBuffer:= ADR(ab_cmd_buffer), udCount:= SIZEOF(ab_cmd_buffer), pResult:= ADR(di_result_wr_cmd)); IF di_result_wr_cmd = 0 THEN (* Leseoperation, um den ADC-Wert zu erhalten *) CDRead(hFile:= I2C_Handle, pbyBuffer:= ADR(ab_data_buffer), udCount:= SIZEOF(ab_data_buffer), pResult:= ADR(di_result_rd_cmd)); IF di_result_rd_cmd = 0 THEN (* ADC-Wert aus den Daten extrahieren *) ui_adc_value_1 := SHL(TO_UINT(ab_data_buffer[0]), 8) OR TO_UINT(ab_data_buffer[1]); ELSE (* Fehler beim Lesen der Daten *) ui_adc_value_1 := 0; (* ADC-Wert auf 0 setzen *) END_IF ELSE (* Fehler beim Schreiben der Konfiguration *) ui_adc_value_1 := 0; END_IF END_IF
Last updated: 2024-12-13

Post by matteodigani on Error using function block "Write alias address" ^{CODESYS Forge talk (Post)}
Hi, I've got a problem using the function block "Write alias address" (ETCStack library 4.9.0.0). this is the code: EtherCAT_1(); IF EtherCAT_1.ConfigRead AND enable THEN CASE seq OF 0: exec := FALSE; T.IN := TRUE; T.PT := T#10S; T(); IF T.Q THEN seq := 1; T.IN := FALSE; END_IF ; 1: T.IN := FALSE; T(); //THIS ONE WORK CORRECTLY! WrAliasAdd.xAbort := FALSE; WrAliasAdd.usiCom := DWORD_TO_USINT(EtherCAT_1.InstanceNumber); WrAliasAdd.wSlaveAddress := 1002; WrAliasAdd.xAutoIncAdr := FALSE; WrAliasAdd.uiAliasAddress := 19; WrAliasAdd.udiTimeOut := 3000; IF start THEN exec := TRUE; ELSE IF NOT error THEN start := TRUE; END_IF END_IF IF WrAliasAdd.xDone THEN start := FALSE; done := TRUE; error := FALSE; exec := FALSE; seq := 5; END_IF IF WrAliasAdd.xError THEN start := FALSE; done := FALSE; error := TRUE; exec := FALSE; END_IF ; 5: exec := FALSE; T.IN := TRUE; T.PT := T#1S; T(); IF T.Q THEN seq := 10; END_IF ; 10: T.IN := FALSE; T(); //THIS ONE GIVES ME AN ERROR! WrAliasAdd.xAbort := FALSE; WrAliasAdd.usiCom := DWORD_TO_USINT(EtherCAT_1.InstanceNumber); WrAliasAdd.wSlaveAddress := 1006; WrAliasAdd.xAutoIncAdr := FALSE; WrAliasAdd.uiAliasAddress := 25; WrAliasAdd.udiTimeOut := 1000; IF start THEN exec := TRUE; ELSE IF NOT error THEN start := TRUE; END_IF END_IF IF WrAliasAdd.xDone THEN start := FALSE; done := TRUE; error := FALSE; exec := FALSE; seq := 99; END_IF IF WrAliasAdd.xError THEN start := FALSE; done := FALSE; error := TRUE; exec := FALSE; END_IF ; ELSE ; END_CASE WrAliasAdd(xExecute := exec); END_IF The first one slave ethercat works correctly, but the other one gives me an error. Attached the ethercat configuration of the devices. All the devices are set "Optional". So my idea is to enable only the first one (1002) and the fifth one (1006).
Last updated: 2025-10-01

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 akrawczyk on Dynamically enabling/disabling Modbus slave devices in runtime (performance issue with timeouts) ^{CODESYS Forge talk (Post)}
Hi everyone, I'm working on a CODESYS-based project running on a Weintek cMT2078X HMI with a built-in CODESYS runtime. The system communicates with multiple Modbus RTU slave devices, arranged in a cascade. The number of connected units can vary between 2 and 8, depending on the installation. Each slave has 17 Modbus channels, which are polled cyclically every 5 seconds. The issue is that when fewer devices are physically connected (e.g. only 3 out of 8), the Modbus master still attempts to communicate with all configured slaves. This leads to massive delays due to timeouts (currently 200ms per channel). For one disconnected device, that’s: 17 × 200ms = 3.4 seconds of delay per polling cycle, and this quickly multiplies with each additional missing slave. This behavior significantly degrades the system's performance and responsiveness. We attempted a workaround where we tried to trigger polling based on a variable in the PLC program, but this caused instability and even led to hardware hangs/freezes on the cMT2078X – likely due to clashes in how the Modbus polling engine and program logic interact at runtime. My main questions are: Is there a way in CODESYS to dynamically enable/disable Modbus slave devices at runtime, using a BOOL or INT variable (e.g. indicating number of active slaves)? Can devices or channels be conditionally polled or temporarily disabled without removing them from the device tree? Are there any best practices or examples for handling variable numbers of Modbus slaves in scalable systems like this? Would splitting communication across tasks or interfaces help reduce the impact of timeouts? Any advice, documentation references, or architectural suggestions would be extremely helpful. I'm looking for a robust way to dynamically scale slave polling without degrading system stability or performance. Thanks in advance!
Last updated: 2025-08-11

Post by nathant on Can't open online view of FB instance from code editor, only from Device/POU windows ^{CODESYS Forge talk (Post)}
Hello, The title pretty much says it all. When trying to open a FB from the CFC/Ladder/SFC editors while online, the FB does not open in an online view of that specific instance. Instead, it opens an offline view with '???' shown for the value of any variable. This makes debugging extremely cumbersome, as I have to find each FB in the POU window and select the specific instance I am trying to view. Anyone know the cause/solution for this? Thanks.
Last updated: 2023-11-08

Post by macros8 on Translation - How to get text as reference in Frames translated? ^{CODESYS Forge talk (Post)}
Hi all, I need a help. I want to create Frame where some parameters are done via reference input to this frame. What I have realized that if I use for Label/Caption etc. string variable (%s) it is not included in translation list. This is a quite a big deal and I did not find way how to add text to the list manually. Would you give me a hint how to proceed? I hope there is a way (workaround) how to do it. Thanks a lot. M.
Last updated: 2023-12-01

Post by konradkmiller on Variable assignments ^{CODESYS Forge talk (Post)}
I have a snippet of code that I was given as a reference in ST. ** ModbusMasterRTU( xConnect:= TRUE, IPort:= IoConfigGlobals.COM1, // IoConfigGlobals.RS232485Interface, // COM1=Front Port / Serial module = Name of module in Devices structure I/O list udiBaudrate:= 19200, usiDataBits:= 8 , eParity:= WagoTypesCom.eTTYParity.None , eStopBits:= WagoTypesCom.eTTYStopBits.One , eHandshake:= WagoTypesCom.eTTYHandshake.None , ePhysical:= WagoTypesCom.eTTYPhysicalLayer.RS485HalfDuplex, xIsConnected=> xIsConnected , xError=> , oStatus=> , eFrameType:= WagoAppPlcModbus.eMbFrameType.RTU , tTimeOut:= T#1S, utQuery:= utQuery , xTrigger:= SEND, utResponse:= utResponse)** What is the meaning of => in this context?
Last updated: 2024-07-20

Post by liamb on Converting CANbus to Decimal from signed 2's complement ^{CODESYS Forge talk (Post)}
I need to combine two 8 bit CANbus messages to 16 bits signed int then convert to decimal Decimal from signed 2's complement. I've been using the below code to read for new messages, combine them then assign them to a variable What is the best way to do this for from signed 2's complement? fbRxMessage351(Data := RxMessage351Data); IF fbRxMessage351.NewMessage THEN ChargeVoltage := (WORD_TO_REAL((RxMessage351Data[0]) + ((RxMessage351Data[1]) * 256))) * 0.1; END_IF
Last updated: 2024-08-16

Post by pietrobalint on Retain / Persistent Variables in Codesys for Raspberry Pi ^{CODESYS Forge talk (Post)}
Hi micik, I am not sure I am using well the code, because I checked the directory and there is no retains.ret file. Now I deleted the code from my project and the values are still works as persistant variables after ssh reboot it seems to me they retain as their previous value. So I am a bit confused, maybe 4.12.0.0 Raspberry Pi SL solved the persitent variable problem...
Last updated: 2024-08-20

Post by docker on Webvisu client connection monitoring ^{CODESYS Forge talk (Post)}
Thanks for the reply, i am using codesys SP16 patch 5 as this is the version that is compatible with my IFM controller. i am accessing the lastusage variable from the VisuStructClientData structure through a pointer. when i log in it lists the time since last log in but does not continually count, it remains a static value which isnt useful. hopefully you can help. Thankyou
Last updated: 2024-08-26

Post by c3po on Visualisierung wechseln über SPS Variable Codesys 3.5 ^{CODESYS Forge talk (Post)}
Sì senor: https://www.helpme-codesys.com/help-sp17-lower.html Abgeschaltet! Peinlich! Ah ich liebe es in Foren nachfragen zu müssen, weil der Support NULL funktioniert. Dieser freundliche Ton immer ô.0 Da bitte, meine Suche: https://www.helpme-codesys.com/search.html?L=1&id=888&tx_solr%5Bq%5D=current+visu 1. Link angeklick: https://content.helpme-codesys.com/en/libs/VisuElemBase/Current/Private-Implementation/pou-Visu_PRG/DoCurrentVisuHandling.html (2. und 3. Link haben mir auch nicht groß weiter geholfen, also habe ich dieses Forum kontaktiert) thx for your help!
Last updated: 2024-08-27

Post by docker on Webvisu client connection monitoring ^{CODESYS Forge talk (Post)}
Hi mate, With this snippet i was able to see the lastusage variable count, but it would not iterate between clients? i was only able to access the data of the target visu. it threw an error with the array of pointers stating it was not able to convert etc. also when i tried it with the while loop it created an endless loop and crashed the program. any ideas? Thankyou
Last updated: 2024-09-10

Post by timvh on Stack overflow with really simple function ^{CODESYS Forge talk (Post)}
You have declared the function block in a function and call the instance also from a function. This is not correct, because a function is initialised with every call. The http client function block should be declared as Global Variable if you want to cal it from a Function, but probably it is better to declare it in a Program and also call the instance of the http function block from the same Program.... The variables of a Program are not initialised with each call.
Last updated: 2024-09-20

Post by pernockham on Is there a pragma for init/instantiation of local variables in FB (like in Methods) ^{CODESYS Forge talk (Post)}
Im using a pointer as input for a FB and for convenience I like to use 'referenced' variable internally. I use this setup in methods which works because internal variables are instantiated for each call. In a FB these variables are instantiated and initiated for the first call only. Is there a pragma/attribute available that changes this behaviour to mirror a 'method'-call?
Last updated: 2024-10-31

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