Post by fmon on Modbus : dis- / re-connect cable: modbus does not re-start ^{CODESYS Forge talk (Post)}
Hello, I am using codesys Modbus TCP client (4.4.0.0) to communicate with a python modbus server (package pyModbusTCP). I first start my python server on the distant machine. After a fresh codesys compilation, a plc connection/transfer and a PLC run, the modbus connection is OK. Every time in this context the connection is created correctly. When I shut down the server, the modbus connection falls, that is normal. When I restart the python server, impossible to recreate the modbus connexion. With the client autoreconnection, I see on my server that the client tries to connect but unsuccesfully. I have the following message : DEBUG:pyModbusTCP.server:accept new connection from ClientInfo(address='192.168.1.20', port=33476) DEBUG:pyModbusTCP.server:Exception during request handling: NetworkError('recv return null') I tried to stop the codesys client and to restart it with these commands : Modbus_TCP_Client.xStop := True; // Or False Modbus_TCP_Client.Enable := True; // Or False Modbus_TCP_Server.Enable := True; // Or False I tried to confirm the error manually to force reconnection with: Modbus_TCP_Server_Motors.xConfirmError := TRUE; I tried also this command to STOP/RESET/START client and server (codesys side) but nothing happens : status_client := Modbus_TCP_Client.SetCommunicationState(eRequestedState := DED.DEVICE_TRANSITION_STATE.STOP); // .RESET & .START The answer of this function when executed is "status_client = NOT_SUPPORTED" It seems that is a socket problem, but I do not understand if it is on the client or server side. I tried a modbus simulator called "ananas.exe" and the result is the same. Impossible to get a modbus reconnection. What is different at the first connection and at a reconnection attempt ? Thanks for your help
Last updated: 2025-03-14

Post by konstantin on Lenze i950 Servo and WAGO PFC200 ^{CODESYS Forge talk (Post)}
Hello, basically the i950 drive support CiA402 Basic and CiA402 Advanced modes. I attached pictures of both mode supported functions. It also support CSP, VL, CSV and CST modes. It seems the homing mode is in CiA402 Advanced mode but how can you not have the homing mode in both modes? It is a vital part of any servo system. If I use the SoftMotion standard demo mode, I can move the servo absolute and relative but cannot home it. But in SoftMotion Light mode, I cannot execute any motion function. Here is the official manual for i950 servo drive - i950 Documentation Best Regards Konstantin Kolev
Last updated: 2026-02-13

Post by ofey on OPC server crash ^{CODESYS Forge talk (Post)}
Hi! I repeatly encounter a crash of the OPC server, which forces a reboot of the controller with frequent connect/disconnect to the server. Have any of you encountered this before? And is it a workaround? ie. deny that particular client connection by timeout or similar instead of crashing the PLC? This is during a development phase of the user interface. Up to 3 others connect/disconnect frequently to test their code. It is a bit troublesome of the PLC crashes several times a day because of this :( I greatly appreciate all comments. I hope it exists a fix for this, or something that hinders the crash. I attached the logfile for the crash
Last updated: 2024-11-26

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

Post by dav3 on Exception auf Raspberry, CMCommCycleTask Tainted ^{CODESYS Forge talk (Post)}
Hello, I don't really know what my problem was, but it's working for me at the moment. All i did was to change my code because of some REAL_TO_INT conversions, like i wrote above. And later a complete new Pi setup (because of 64x support with 4.10.0.0 now).
Last updated: 2024-02-16

SysSem and SysFile warnings and errors ^{CODESYS Forge talk (Thread)}
SysSem and SysFile warnings and errors
Last updated: 2020-04-03

Toradex and CODESYS and licensing ^{CODESYS Forge talk (Thread)}
Toradex and CODESYS and licensing
Last updated: 2025-10-21

Post by dhumphries on Toggling Visualizations using HMI Physical Buttons ^{CODESYS Forge talk (Post)}
Nothing wrong with ladder, in a lot of applications it is simpler than ST or CFC, you're a lot less likely to have syntax issues in a ladder diagram than in structured text as long as you stick with traditional ladder elements. Your attempt was almost valid, but you tried to change the currentvisu variable using a blend of structured text and ladder, which isn't allowed. You need to use the MOVE operator and define the visualization name as a string on the input side and the visuelems.currentvisu as the target on the output side.
Last updated: 2024-02-28

Is OPC communication possible with server certificate but no client certificate ^{CODESYS Forge talk (Thread)}
Is OPC communication possible with server certificate but no client certificate
Last updated: 2023-10-06

Error while processing the visualization: Client id not present or no longer valid ^{CODESYS Forge talk (Thread)}
Error while processing the visualization: Client id not present or no longer valid
Last updated: 2024-08-21

Post by damian177 on OPC UA Client ^{CODESYS Forge talk (Post)}
Everything works. Any can help me with change the OPC UA Client Example to my needed ?
Last updated: 2024-09-02

setting up Raspberry pi as an opc ua Server with UaExpert as Client ^{CODESYS Forge talk (Thread)}
setting up Raspberry pi as an opc ua Server with UaExpert as Client
Last updated: 2024-09-11

Setting up Raspberry pi as an Opc ua Server with UaExpert as Client ^{CODESYS Forge talk (Thread)}
Setting up Raspberry pi as an Opc ua Server with UaExpert as Client
Last updated: 2024-09-11

Post by sinameshksar on TCP Socket Client ^{CODESYS Forge talk (Post)}
Hello I'm looking for a TCP socket client project example. Can you assist?
Last updated: 2024-09-11

Eine Nummer (Data Type=Double) Schicken mit TCP Client Server Codesys ^{CODESYS Forge talk (Thread)}
Eine Nummer (Data Type=Double) Schicken mit TCP Client Server Codesys
Last updated: 2021-09-08

SIP-Client Linphone über SysProcessExecuteCommand steuern um VOIP-Anruf bei Störung zu tätigen ^{CODESYS Forge talk (Thread)}
SIP-Client Linphone über SysProcessExecuteCommand steuern um VOIP-Anruf bei Störung zu tätigen
Last updated: 2023-07-28

3.5.17: Setting up OPCUA Client data source to another PLC OPCUA server ^{CODESYS Forge talk (Thread)}
3.5.17: Setting up OPCUA Client data source to another PLC OPCUA server
Last updated: 2021-11-02

Is CODESYS webserver not up running before the DHCP client has got an ip-address? ^{CODESYS Forge talk (Thread)}
Is CODESYS webserver not up running before the DHCP client has got an ip-address?
Last updated: 2023-07-13

Eine Nummer (Data Type=Double) Schicken mit TCP Client Server Codesys ^{CODESYS Forge talk (Thread)}
Eine Nummer (Data Type=Double) Schicken mit TCP Client Server Codesys
Last updated: 2021-09-08

The "Cartesian XY chart" objects do not seem to be managed independently on each connected client. ^{CODESYS Forge talk (Thread)}
The "Cartesian XY chart" objects do not seem to be managed independently on each connected client.
Last updated: 2023-04-19

FTP client based on OSCAT, but works on 64 bit systems ^{CODESYS Forge talk (Thread)}
FTP client based on OSCAT, but works on 64 bit systems
Last updated: 2023-08-14

Connect opc client to external opc ua simulation server through opc ua ^{CODESYS Forge talk (Thread)}
Connect opc client to external opc ua simulation server through opc ua
Last updated: 2023-08-05

Update variables when OPC UA Client updates. Error ID: 268468277 BadAttributeIdInvalid ^{CODESYS Forge talk (Thread)}
Update variables when OPC UA Client updates. Error ID: 268468277 BadAttributeIdInvalid
Last updated: 2024-01-08

CAA net base TCP client cause PLC to crash - Kernel message : N0HZ_local_softirq_pending 80 ^{CODESYS Forge talk (Thread)}
CAA net base TCP client cause PLC to crash - Kernel message : N0HZ_local_softirq_pending 80
Last updated: 2024-01-12

OPC UA Server with on Codesys + OPC UA Client on Labview ^{CODESYS Forge talk (Thread)}
OPC UA Server with on Codesys + OPC UA Client on Labview
Last updated: 2024-04-12

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