Forge 🇬🇧 ^{CODESYS Forge talk (Discussion)}
Discussions about CODESYS Forge projects and features of the CODESYS Forge website
Last updated: 2026-06-15

Post by herbasso88 on WebVisu flickering ^{CODESYS Forge talk (Post)}
Good morning, I'm new on Codesys Forge, so I'm not sure if this is the right place to talk about my problem. When I open my WebVisu pages with Microsoft Edge, or Chrome, the background and also some rectangles blinking without reason!!! The application is developed with Codesys 3.5.17.10 and run on Codesys HMI, same version (3.5.17.10). After several experiments I discover that the problem happens when I made dynamic the "End of area" property of a meter object, but I can't understand why this blinking problem happens. Also, the problem is only at the WebVisu page, the "normal" VISU pages (the ones opened when Codesys HMI start) work always perfectly. Another strange thing is that the problem happens only if on the same page, where there is the meter object, there is also a trend object!?!? Codesys HMI is running on a Virtual Machine (VMware Workstation 15 player, v.15.5.6) running Windows 10 Pro N 64-bit. The blinking problem happen also if I convert the project to Codesys 3.5.20.0. This version of Codesys and Codesys HMI are installed on a Virtual Machine running Windows Server 2019 Standard 64-bit. In attachment the archive of my project. The attached project has only one page, if "Enable Counter" is not pressed the "End of area" variable of the meter is not updated in the software, and everything work well, normal VISU and WebVisu; if "Enable Counter" is pressed, the "End of area" variable of the meter is updated in the software, and the WebVisu page start blinking. I tried also to enable the "Support client animations and overlay..." property at VisualizationManager, this seems stop the blinking problem, but that property also destroy my WebPage, moving almost all the graphical object, that also seem not working anymore. I really need help to understand what I'm doing wrong, I have to develop a bigger project and I have to understand if trend objects and animated meters cannot stay in the same page. In the final project the WebVisu will be very important because the customer will use this way to access the application to monitor the process. Regards
Last updated: 2024-05-06

Post by olehmann03 on PFC200 - WAGO 750-8202 - MODBUS RTU ^{CODESYS Forge talk (Post)}
Hello, I’m working on implementing Modbus RTU communication with a Carel controller (CPCO). I want to use the front RS485 interface through the DB9 connector. The issue is that I can’t get the communication working correctly. Below are the steps I’ve done so far: Connected pins 3 and 8 from the DB9 connector to the +/- RX/TX terminals on the Carel side. In the PLC shell, I set serialmode to RS485. In WBM under Administration > Serial Interface > Assign owner of serial interface, I set the port to unassigned. In the device tree, I created Modbus_COM with the following settings: COM port: 1 Baud rate: 19200 Parity: None Stop bits: 1 Created a Modbus client on this COM interface in RTU mode. Under the status tab, I can see it is in running state. On the client, I created a Modbus server and set the Modbus address of my unit to 1. Defined a few channels as FC03 to read holding registers according to the Carel register map. I checked the communication with the Carel controller using a USB-to-RS485 converter connected to my PC, and communication works correctly there. In the status tab, I can see that the Modbus server is polling, but there is no response from the controller. I also tried multiple times swapping A/B lines on the Carel side, but it did not help. Do you have any suggestions on what else I should check?
Last updated: 2026-05-22

Post by olehmann03 on PFC200 - WAGO 750-8202 - MODBUS RTU ^{CODESYS Forge talk (Post)}
Hello, I’m working on implementing Modbus RTU communication with a Carel controller (CPCO). I want to use the front RS485 interface through the DB9 connector. The issue is that I can’t get the communication working correctly. Below are the steps I’ve done so far: Connected pins 3 and 8 from the DB9 connector to the +/- RX/TX terminals on the Carel side. In the PLC shell, I set serialmode to RS485. In WBM under Administration > Serial Interface > Assign owner of serial interface, I set the port to unassigned. In the device tree, I created Modbus_COM with the following settings: COM port: 1 Baud rate: 19200 Parity: None Stop bits: 1 Created a Modbus client on this COM interface in RTU mode. Under the status tab, I can see it is in running state. On the client, I created a Modbus server and set the Modbus address of my unit to 1. Defined a few channels as FC03 to read holding registers according to the Carel register map. I checked the communication with the Carel controller using a USB-to-RS485 converter connected to my PC, and communication works correctly there. In the status tab, I can see that the Modbus server is polling, but there is no response from the controller. I also tried multiple times swapping A/B lines on the Carel side, but it did not help. Do you have any suggestions on what else I should check?
Last updated: 2026-05-22

Post by simotion on Axis variable indicating modulo of finite setting ^{CODESYS Forge talk (Post)}
What variable of the axis indicates it is a modulo of finite axis? I want to check that in the code, to adopt my motion code between the two types.
Last updated: 2023-11-24

Post by xgongx on What is the insights of IoDrvEtherCAT.DCInSyncWindow? ^{CODESYS Forge talk (Post)}
It is well known that you need to increase the value of IoDrvEtherCAT.DCInSyncWindow to solve the "Fieldbus lost synchronicity" issue. In the official document, IoDrvEtherCAT.DCInSyncWindow is explained as the toleration of a certain jitter. But the official document doesn't explain what kind of the jitter is. Is it the jitter of DC sync deviation, master timer or something else? It is very important to know the insights of IoDrvEtherCAT.DCInSyncWindow. For example, if it is the toleration of DC sync deviation, and the official recommending value is 200us for CODESYS SoftMotion. It means maximum of DC sync deviation is 200us. It is unacceptable for some high precision motion control tasks, for example high speed gear task, etc. Increasing the value of IoDrvEtherCAT.DCInSyncWindow will increase the deviation of motor rotation sync if it is the toleration of DC sync deviation. So, would anyone tell me what the insights of IoDrvEtherCAT.DCInSyncWindow is? Thanks.
Last updated: 2024-07-09

Post by banialuk on CAN Open Manager - varible of SYNC ^{CODESYS Forge talk (Post)}
Hello, were I have find varaible of SYNC "Cycle Period" , or variable that informs about the start of a new cycle SYNC. I want to use this variable in program code. I need to for communication beetween Mster and slave, and send PDO informations.
Last updated: 2024-10-26

Post by banialuk on CAN Open Manager - varible of SYNC ^{CODESYS Forge talk (Post)}
Hello, were I have find varaible of SYNC "Cycle Period" , or variable that informs about the start of a new cycle SYNC. I want to use this variable in program code. I need to for communication beetween Mster and slave, and send PDO informations.
Last updated: 2024-10-26

Post by timvh on Case Function - Multiple Conditions, Is it possible? ^{CODESYS Forge talk (Post)}
This is not possible. Possible solution could be: CASE var1 OF 10: CASE var2 OF 10:; 20:; END_CASE 20: CASE var2 OF 10:; 20:; END_CASE ELSE ; END_CASE
Last updated: 2024-11-05

Post by abrarsk on Download libraries of old versions ^{CODESYS Forge talk (Post)}
You can download the missing libraries by clicking on the "Download Missing Libraries" button. However, if you were unaware of this and accidentally downloaded the latest version of the library from the Library Repository, you may need to uninstall it first to avoid conflicts.
Last updated: 2025-02-11

Post by ivanmaltar on Codesys Control shutdown ^{CODESYS Forge talk (Post)}
Hello, the problem was that the 4.6.0.0 Codesys control was not compatible with S versions of the RevPi controller because of the becuase of the Compute Module 4S. For those controllers, 4.8.0.0 version must be used.
Last updated: 2024-03-25

Post by danamocca on SM3_CNC Sentence modifier ^{CODESYS Forge talk (Post)}
Hi! Does anyone have an example of ReadNCFile2 with Sentence Modifier? Current examples on CODESYS help page are outdated and have a lot of errors, like "SMC_CNC_LibParams.MAX_SUBPROGRAM_NESTING_DEPTH" calls, which are not present in current version of SMC3_CNC library.
Last updated: 2025-12-25

Post by eschwellinger on Linux ARM64 Deploy Fail - Index out of range ^{CODESYS Forge talk (Post)}
I would check the version of the deloy tool using the CODESYS installer. Sure manually installing works too, but woukd nice to know if there is a problem. Currebt version is 4.21.0.0 of the deploytool.
Last updated: 2026-07-01

Post by alexgooi on OPC-UA and other communication questions ^{CODESYS Forge talk (Post)}
Dear forum, I currently have a big question mark above my head, and maybe this forum can shine some light on the situation. I recently updated to Codesys 3.15 SP19 Patch 6. And now I’m trying to setup the OPC-UA server, besides that I’m trying to connect to the controller with the Codesys V3 (Ethernet) protocol. OPC-UA I have installed the correct licenses on my controller (Runtime and communication). I’m able to connect to the controller with an OPC-UA client, and I’m able to browse the tags, so far so good. Therefore I’m assuming that the OPC-UA server is running on the controller. But now the strange part, in the device security settings I have set the communication Policy to BASCI256SHA256 ( I also have tried the other ones) and the communication mode is set to secure if possible (I also have tried all the other ones) (see picture). With these settings I would assume that I would only be able to login with a Basic256SHA256 policy with a client. But the opposite is true, I am able to login using the no policy mode and when I set it to Basic256SHA256 the client (UA-Expert) notes that this policy is not available on the server. I then check the certificates and I noted that there is no certificate for the OPC-UA server, I tried to generate one but it gave the error that the certificate has not been created by the device (See picture). To summarize I have no clue what is going on, and the controller does the opposite of what I would expect. Codesys Ethernet V3 driver I have a HMI connected to the same controller using the Ethernet V3 driver. But this will not connect. I tried all the Protocols (see picture), with and without the username and password enabled. But it will not connect, when I scan the available servers I can see the controller with the port number that I am expecting, so I’m assuming that the Codesys V3 ethernet driver is up on the controller. Does anyone can give me some direction, because the stuff that I tried doesn’t make sense to me. Thank you in advance
Last updated: 2024-04-02

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 transmin01 on SafetyApp - Exchange 8 bits from EtherCAT Safety Module to PLC mapping issue ^{CODESYS Forge talk (Post)}
Hi, I am using an "Exchange 8 bits from EtherCAT Safety Module to PLC" module which allows me to create tags in the safety environment, but how does this map to the standard PLC program? There is no entry in the IoConfig_Globals variables list. Regards Trevor
Last updated: 2023-09-27

Post by phoward131 on Alarm filtering latch variables ^{CODESYS Forge talk (Post)}
I am having the exact same issue and was wondering if you ever found the problem? The sample program does exactly what it's supposed to with filtering but when I implement it the exact same way in my program, the alarm list just goes blank when I attempt to apply a filter.
Last updated: 2024-10-28

Post by eschwellinger on Codesys Network driver install for Codesys Control RTE x64 ^{CODESYS Forge talk (Post)}
Yes, either adding in the CODESYSContro_User.cfg because the driver will no longer appear in the list or type the name from the documentation in the configuration and when the gray check mark appears, the driver is also installed. It is just not selectable anymore.
Last updated: 2025-03-21

Post by pafarrell on EtherCAT quick start for advanced programmers ^{CODESYS Forge talk (Post)}
It would be great if there was a thread that had some quick-start links for basic how-to. But one that advanced programmers can jump into. I found this video playlist by SoftMotion-Black, which was very, very helpful: https://www.youtube.com/playlist?list=PLkc8m2OD0r9xJyfTiCBb1vuU_d2yBhjZ_ This person has some other great vids like creating your own custom library, which is awesome for OEMS.
Last updated: 2025-05-14

Post by davidking on Error, visualisation property handling, VISU_USEPROPERTYINFO ^{CODESYS Forge talk (Post)}
Solution: Disable VISU_USEPROPERTYINFO define Go to Project → Options (or Project → Properties, depending on your CODESYS version). Find the section called Compiler Defines. Look for the define: nginx Copy Edit VISU_USEPROPERTYINFO Delete it from the list, or uncheck it if it’s a checkbox. Save your changes and try compiling the project again. → This is the right approach if you don’t need property handling for visualization elements.
Last updated: 2025-07-09

Post by kees-b on Enumeration ^{CODESYS Forge talk (Post)}
Hello, Can anyone give me advice or tell me what I'm doing "wrong"? I use "enumeration", but via, via (maybe that's the problem?) Similar situation in Codesys 2.3 this worked correctly. Now the BOOL is not found in the ENUM. GVL.g_IPC2AMK.dwDO.DO_AMK_REMOTE_ACTIVE GVL = Global Variabel List g_IPC2AMK = STRUCT dwDO = ENUM DO_AMK_REMOTE_ACTIVE = BOOL
Last updated: 2024-02-06

Post by kees-b on Enumeration ^{CODESYS Forge talk (Post)}
Hello, Can anyone give me advice or tell me what I'm doing "wrong"? I use "enumeration", but via, via (maybe that's the problem?) Similar situation in Codesys 2.3 this worked correctly. Now the BOOL is not found in the ENUM. GVL.g_IPC2AMK.dwDO.DO_AMK_REMOTE_ACTIVE GVL = Global Variabel List g_IPC2AMK = STRUCT dwDO = ENUM DO_AMK_REMOTE_ACTIVE = BOOL
Last updated: 2024-02-06

Post by timvh on Persistent Retain Variables Not Visible in Online View (WAGO PFC100 + CODESYS) ^{CODESYS Forge talk (Post)}
It is a known issue. It only happens with CODESYS and Wago controllers and the Persistent Variables. It seems related to using 64 bit variables in the PV list (e.g. LREAL). Internally in the PLC everything works okay. It is just a monitoring issue.
Last updated: 2025-10-26

Post by alexschooneveld on OPC UA PubSub SL 1.3 — UADP WriterGroup with assigned PSS.SecurityGroup still publishes plaintext ^{CODESYS Forge talk (Post)}
I am currently investigating an OPC UA PubSub connection over UDP. When I don't use encryption, the publish and subscribe are working correctly. But with encryption it does not. Environment OPC UA PubSub SL 1.3.0.0 (namespace UADP) OPC UA PubSub Security 1.3.0.0 (namespace PSS) OPC UA PubSub Base 1.3.0.0 (namespace PSB, incl. PSS.SecurityGroup / PSS.CONFIG) Programmatic PubSub in a CFC: UADP.Configuration → UADP.Connection → UADP.writerGroup → UADP.writer → writerDataSet, plus a CyclicCall gated by xEnable. Goal: publish secured UADP, SignAndEncrypt, policy PubSub-Aes256-CTR. What I do (one-shot, before xEnable := TRUE): fbSecurityGroup.SetInitialValue( 'http://opcfoundation.org/UA/SecurityPolicy#PubSub-Aes256-CTR', PSB.SECURITY.SIGNING_AND_ENCRYPTION); stSecurityCfg := fbSecurityGroup.GetConfig(eErrorID => eError); // eError=NO_ERROR, udiEncryptionKeySize=32 eError := fbSecurityGroup.SetSecurityKeys(udiTokenId, ADR(abyKey), SIZEOF(abyKey), 2436001000); // eError=NO_ERROR, SIZEOF=68 // writerGroup.itfSecurityGroup := fbSecurityGroup -- set in the WriterGroup block's Parameters (a per-scan code write got overwritten) What I verified eError = NO_ERROR after both GetConfig and SetSecurityKeys; udiEncryptionKeySize = 32. Key length = 68 bytes (signing 32 ‖ encrypt 32 ‖ nonce 4). itfSecurityGroup is set via the WriterGroup's Parameters (so it isn't clobbered each scan). Init runs before xEnable (the writer doesn't run with xEnable=FALSE). The UADP.writerGroup FB exposes only itfSecurityGroup for security — no SecurityMode/MessageSecurityMode property. Result: the published datagrams are still plaintext — ExtendedFlags1 = 0x01 (security bit 0x10 clear), no security header: b1 01 29 00 0f 16 00 … (PublisherId 41, WriterGroupId 22, RawData, no security) Questions With UADP.writerGroup, is assigning a configured + keyed PSS.SecurityGroup to itfSecurityGroup sufficient to enable message security, or is there an additional step/property/method to switch the WriterGroup to SignAndEncrypt? At what point in the WriterGroup lifecycle is itfSecurityGroup read? Must it be assigned/keyed before xActive, and does the group need a stop→start to pick it up? Is there a required call order, and does SetSecurityKeys need to be called once or repeatedly? Should security be configured on the Connection/Configuration level rather than (or in addition to) the WriterGroup? Is there a working example of secured (SignAndEncrypt) programmatic UADP publishing with this library, or a known limitation in 1.3? How can I read back at runtime whether security is actually active (via itfDiagnostics or similar)? Additional information I can confirm that the consumer side works — i.e. a standard subscriber decrypts the same keys fine — so the keys/profile aren't the issue. The Wireshark capture of the published message is: 0000 b1 01 29 00 0f 16 00 df 0d bb 25 01 00 0e 00 1b ..).......%..... 0010 0e 00 00 00 00 00 00 00 ........
Last updated: 2026-06-22

Post by alexschooneveld on OPC UA PubSub SL 1.3 — UADP WriterGroup with assigned PSS.SecurityGroup still publishes plaintext ^{CODESYS Forge talk (Post)}
I am currently investigating an OPC UA PubSub connection over UDP. When I don't use encryption, the publish and subscribe are working correctly. But with encryption it does not. Environment OPC UA PubSub SL 1.3.0.0 (namespace UADP) OPC UA PubSub Security 1.3.0.0 (namespace PSS) OPC UA PubSub Base 1.3.0.0 (namespace PSB, incl. PSS.SecurityGroup / PSS.CONFIG) Programmatic PubSub in a CFC: UADP.Configuration → UADP.Connection → UADP.writerGroup → UADP.writer → writerDataSet, plus a CyclicCall gated by xEnable. Goal: publish secured UADP, SignAndEncrypt, policy PubSub-Aes256-CTR. What I do (one-shot, before xEnable := TRUE): fbSecurityGroup.SetInitialValue( 'http://opcfoundation.org/UA/SecurityPolicy#PubSub-Aes256-CTR', PSB.SECURITY.SIGNING_AND_ENCRYPTION); stSecurityCfg := fbSecurityGroup.GetConfig(eErrorID => eError); // eError=NO_ERROR, udiEncryptionKeySize=32 eError := fbSecurityGroup.SetSecurityKeys(udiTokenId, ADR(abyKey), SIZEOF(abyKey), 2436001000); // eError=NO_ERROR, SIZEOF=68 // writerGroup.itfSecurityGroup := fbSecurityGroup -- set in the WriterGroup block's Parameters (a per-scan code write got overwritten) What I verified eError = NO_ERROR after both GetConfig and SetSecurityKeys; udiEncryptionKeySize = 32. Key length = 68 bytes (signing 32 ‖ encrypt 32 ‖ nonce 4). itfSecurityGroup is set via the WriterGroup's Parameters (so it isn't clobbered each scan). Init runs before xEnable (the writer doesn't run with xEnable=FALSE). The UADP.writerGroup FB exposes only itfSecurityGroup for security — no SecurityMode/MessageSecurityMode property. Result: the published datagrams are still plaintext — ExtendedFlags1 = 0x01 (security bit 0x10 clear), no security header: b1 01 29 00 0f 16 00 … (PublisherId 41, WriterGroupId 22, RawData, no security) Questions With UADP.writerGroup, is assigning a configured + keyed PSS.SecurityGroup to itfSecurityGroup sufficient to enable message security, or is there an additional step/property/method to switch the WriterGroup to SignAndEncrypt? At what point in the WriterGroup lifecycle is itfSecurityGroup read? Must it be assigned/keyed before xActive, and does the group need a stop→start to pick it up? Is there a required call order, and does SetSecurityKeys need to be called once or repeatedly? Should security be configured on the Connection/Configuration level rather than (or in addition to) the WriterGroup? Is there a working example of secured (SignAndEncrypt) programmatic UADP publishing with this library, or a known limitation in 1.3? How can I read back at runtime whether security is actually active (via itfDiagnostics or similar)? Additional information I can confirm that the consumer side works — i.e. a standard subscriber decrypts the same keys fine — so the keys/profile aren't the issue. The Wireshark capture of the published message is: 0000 b1 01 29 00 0f 16 00 df 0d bb 25 01 00 0e 00 1b ..).......%..... 0010 0e 00 00 00 00 00 00 00 ........
Last updated: 2026-06-22

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