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Last updated: 2024-10-26

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Last updated: 2024-10-26

Post by gilbert-mh on CAA net base TCP client cause PLC to crash - Kernel message : N0HZ_local_softirq_pending 80 ^{CODESYS Forge talk (Post)}
Hello all, I have been trying to implement a TCP client on a Festo PLC (CPX-E-CEC-M1) and it looks like it works well except that after some time (greatly varies between a few hours to more than 100h) my PLC crash. When I look into the log file the only thing I see is that before the crash happens a few kernel warnings : N0HZ_local_softirq_pending 80 and then the crash. I've looked into this warning and from what I could find on the net it seems that this is warning is triggered when the ethernet link is down. I've tried to correct this bug for quite some time and what I know is that : - The crash is caused by my TCP client, when I remove it from my code I see no crash - The crash happens more quickly the more the TCP client is used. - The time before the crash is not directly proportional to the number of communications or their size. But it looks like it is just more likely to happen if the client connect to the server at a higher frequency. - The precedent observation makes it seem unlikely that the crash is caused by some memory overflow because then the crash speed would be more proportional to the amount of data exchanged. SO from these observations, I believe that the crash could be caused by the PLC trying to connect to a server while there is some kind of issue with the ethernet link resulting in the PLC getting stuck in some indefinite state and making it crash. This still seems a bit unlikely to me because if the ethernet is down it simply shouldn't be able to contact the server and the communication would just fail which doesn't cause my PLC to crash. Has anyone encountered the same kind of problem (with the same kernel message) ? I am pretty sure the warning is not the direct cause of the crash but just an indicator that something is wrong with my PLC. Thanks in advance
Last updated: 2024-01-12

Post by dhumphries on Control Runtime Toolkit ^{CODESYS Forge talk (Post)}
I have a video demonstrating the procedure to install the runtime on a linux device. https://youtu.be/rj0dOhgnGjs?si=OJoA-kgc1saxIweR This demonstration shows how to install the runtime on a X86 based controller, it should be the same for an ARM based device, but you'll need to install the add-in for Codesys control for Linux ARM SL (or the 64 bit add-in.)
Last updated: 2023-12-30

Post by serwis on Dynamic target position tracking ^{CODESYS Forge talk (Post)}
Hello, I am trying to control a servo drive and dynamically set its position. I control the drive via EtherCAT with a cycle time of 500us. I use the MC_MoveAbsolute block for this. The problem is that when using a PID controller, I generate the positions I want the drive to move to on an ongoing basis, and I would like the position to be set immediately. The MC_MoveAbsolute block must receive a rising edge to execute, and I would like the movement to be performed without waiting for this edge. I have created a function that generates a rising edge every 1 ms, but I am unable to change this time to 500 µs because the TON function does not support times shorter than 1 ms. Below is the code to call the rising edge: IF Exe = TRUE THEN delay1(IN:=TRUE, PT:=T#1MS); IF delay1.Q = TRUE THEN Exe := FALSE; delay1(IN:=FALSE); END_IF END_IF IF Exe = FALSE THEN delay(IN:=TRUE, PT:=T#1MS); IF delay.Q = TRUE THEN Exe := TRUE; delay(IN:=FALSE); END_IF END_IF END_IF Here is the code for calling the MC_MoveAbsolute function: MoveDegree( Axis:= Tilt, Execute:= Exe, Position:= position_target - (base_angle_real * feedforward_turn), Velocity:= vel, Acceleration:= acc, Deceleration:= dec, Jerk:= jerk, Direction:= MC_DIRECTION.shortest, BufferMode:= MC_BUFFER_MODE.Aborting, Done=> , Busy=> , Active=> , CommandAborted=> , Error=> , ErrorID=> ); I realize that there are probably better methods for performing this type of task. How can I implement motion with a dynamically changing setpoint? THANKS
Last updated: 2025-09-05

Post by pernockham on Persistence Manager: Config File not found? ^{CODESYS Forge talk (Post)}
Thats what I did. The files existed originally, but when I had problems logging in as described I deleted those files (if they in some way had been corrupted causing my problems to login?). After that I have not managed to get the system to re-created these def-files. I manually created the folder structure (from CODESYS file browser) but this has not helped.
Last updated: 2024-11-02

Post by fleaplc on File access operation denied ^{CODESYS Forge talk (Post)}
file to access has to be into the path /var/opt/codesys/PlcLogic I has same issue time ago...
Last updated: 2024-11-17

Post by aniket-b on "Distributed clocks are not synchronized, Rea time problem on hardware" ? ^{CODESYS Forge talk (Post)}
I am getting the same error. does anyone know how to troubleshoot this?
Last updated: 2024-03-04

Post by nano on Display minutes as hours & minutes ^{CODESYS Forge talk (Post)}
hey time := INT_TO_TIME(minutes * 1000 * 60); update: forum show the math wrong
Last updated: 2024-05-26

Post by vstrom on Extended Alarm description for a alarm selected in Alarm Table ^{CODESYS Forge talk (Post)}
Does anybody know how I can display a popup with details of the selected alarm in the alarm table? I'd like to help the operator about the reason for the alarm occur and which are to do. Thanks a lot.
Last updated: 2024-07-16

Post by vstrom on Extended Alarm description for a alarm selected in Alarm Table ^{CODESYS Forge talk (Post)}
Does anybody know how I can display a popup with details of the selected alarm in the alarm table? I'd like to help the operator about the reason for the alarm occur and which are to do. Thanks a lot.
Last updated: 2024-07-16

Post by mrkm-dic on UC20-M4000 Redundancy – Application is not automatically synchronized and redundancy breaks after online change ^{CODESYS Forge talk (Post)}
Hello, I am currently testing redundancy using two UC20-M4000 controllers with CODESYS Control SL. The basic redundancy functionality (Active/Passive switching and failover) works, but I am experiencing problems when updating the application. Environment Controller: Weidmüller UC20-M4000 OS: u-OS Runtime: CODESYS Control SL 4.12.1.0-1 Redundancy link: dedicated Ethernet connection between the two controllers Time synchronization: NTP configured, time difference between controllers is about 1–2 seconds Current behavior Application synchronization When I download a modified application to PLC1 (Active controller), the application is not automatically copied to PLC2 (Passive controller). However, when I perform a path swap, the application download to PLC2 starts automatically. My expectation was that the Passive controller would automatically receive the updated application after downloading to the Active controller. Online change When performing an online change, redundancy is lost and the controllers switch to Standalone mode. Typical log messages include: RedundancySynchronize called Redundancy failover itself works correctly. The application boot project exists on both controllers (Application.app and Application.crc). Network interfaces are up and correctly configured. Question Is this behavior expected when updating the application in a redundant UC20-M4000 setup? Should the Passive PLC automatically receive the updated application, or is manual synchronization required? Any advice or recommended configuration for stable redundancy during online change and application download would be greatly appreciated. Thank you.
Last updated: 2026-03-16

Post by timvh on how to extract the name of an FB to a variable ^{CODESYS Forge talk (Post)}
https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_pragma_attribute_instance_path.html
Last updated: 2024-10-01

Post by arwie on Eoe issues with Windows and Linux ^{CODESYS Forge talk (Post)}
You can select the tap name with this environment variable: RTS_EOE_DEV=tap3
Last updated: 2024-10-07

Post by nmcc on Toggling Visualizations using HMI Physical Buttons ^{CODESYS Forge talk (Post)}
Here is a screenshot. I really do not know how to format the variable exchange you are talking about.
Last updated: 2024-02-13

Post by nmcc on Toggling Visualizations using HMI Physical Buttons ^{CODESYS Forge talk (Post)}
Here is a screenshot. I really do not know how to format the variable exchange you are talking about.
Last updated: 2024-02-13

Post by baott569 on Limitation on OPC UA Variable 100+ variables on raspberry pi ^{CODESYS Forge talk (Post)}
Sorry, not trying to spam, My internet lagged and I thought the comment wasn’t submitted
Last updated: 2026-01-22

Post by baott569 on Limitation on OPC UA Variable 100+ variables on raspberry pi ^{CODESYS Forge talk (Post)}
Hi, did you manage to resolve this issue?, I’m experiencing the same problem
Last updated: 2026-01-22

Post by milan-svarny on ModbusFB.ClientSerial Problem with Reply Timeout ^{CODESYS Forge talk (Post)}
Hi All, I have problem with ModbusFB.ClientSerial. I'm using 4 different port for Modbus communication. After some time of running program ClientSerial stops to receive data to reply buffer and all request finish with Reply Timeout. The Device sent reply correctly,that it is visible on oscilloscope and it is possible to see that data( reply )are in the device. If the usbtty device is read over external app. then it is possible to see all data which were not taken by ModbusFB.ClientSerial. The stack does not overflow or something , program runs correctly forward and no exceptions or something. The main problem it is that when the error occur than it is not possible to reset port or something or maybe i'm doing it wrong way. please help me with this issue. Thank you for any help in advice Milan
Last updated: 2025-05-23

Post by nulltrace on How change Unity-ID in TCP Modbus Slave ^{CODESYS Forge talk (Post)}
Please explain how you configured that. Normaly, the Server should answer to all UID as long as gateway isn't activated. With activated gateway all UID will be forwarded to Serial-Interface, in taht case 255 has to be used for Gateway-Diagnostics. So that means, there is somethink wrong on your configuration. Which CDS-Version, Which Runtime-Version and so on are used.
Last updated: 2026-04-01

Post by pierre123 on User management - User Tab missing ^{CODESYS Forge talk (Post)}
i had the same problem. Thanks you for the response.
Last updated: 2023-08-25

Post by jinlee on Camera Feed (CCTV) ^{CODESYS Forge talk (Post)}
Hi, Thanks for the information. However, I can't download the associated project.
Last updated: 2024-09-12

Post by eschwellinger on The application does not exist on "device" ^{CODESYS Forge talk (Post)}
please check the plc logger for more details
Last updated: 2024-12-17

Post by tk096 on Fieldbus has lost synchronicity ^{CODESYS Forge talk (Post)}
Hi, a few suggestions on how to tackle the problem: - it might help to increase the cycle time of the ethercat task - increase the value of the ethercat parameter DCInSyncWindow (https://content.helpme-codesys.com/en/libs/IODrvEtherCATDriver/Current/pou-IoDrvEtherCAT/DCInSyncWindow.html) (see attached image) - enable FrameAtTaskStart (https://content.helpme-codesys.com/en/libs/IODrvEtherCATDriver/Current/pou-IoDrvEtherCAT/FrameAtTaskStart.html) in the ethercat master (see attached image) - if the drives can handle the synchronization problems, checking of the synchronization can be deactivated using SMC_Set_ETC_DCSyncSupervision (https://content.helpme-codesys.com/en/libs/SM3_Drive_ETC/Current/SMC_Set_ETC_DCSyncSupervision.html).
Last updated: 2024-04-11

Post by askic on Name Validation of Visualization objects ^{CODESYS Forge talk (Post)}
Hello, In my projects, I'm following this recommendation about the rule names in Codesys https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_rules.html, so I always use backtick identifiers, not only for variables, but also for the object names. However, I have noticed that in the current version of Codesys, when adding Visu object, it is not allowed to used these identifiers in the name. This is very different from all other objects like, folder names, POU names, Variable list names etc. I wonder if there is some hidden settings I can use to enable backtick identifiers in the Visu object names? Attached is a screenshot with the details. Thank you!
Last updated: 2025-01-10

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