Post by thomasrek31 on Textfield display problem ^{CODESYS Forge talk (Post)}
Hello, have you found a solution? It seems I have the same problem as you. I can't remove the overlay, otherwise certain functions stop working.
Last updated: 2026-03-23

Post by thomasrek31 on Textfield display problem ^{CODESYS Forge talk (Post)}
Hello, have you found a solution? It seems I have the same problem as you. I can't remove the overlay, otherwise certain functions stop working
Last updated: 2026-03-23

Post by ulvis on CAA 3.5.16 TLS configuration - certificate ^{CODESYS Forge talk (Post)}
Hi, did yo have any luck with this? I am facing the same challenge. Using a WinCTRLx64 but I get AccessViolation error in my CmpTlsCreateContext() call.
Last updated: 2026-03-23

Post by lukasz on Unresolved reference when trying to upload to Codesys Runtime V3 ^{CODESYS Forge talk (Post)}
Hello! I'm working with Codesys SP21 Patch 4. The project builds without any errors. When trying to upload my project to Codesys Runtime V3 x64 I get a lot of Unresolved Reference errors, all with FU- at the start and then -CLOSELAYER2, -GETBUSINFO, -GETFRAME etc. I also get a error pop-up that I should 'update device' in the project but it's not specified to which version or anything useful really.There's also not much to choose from. When I check Runtime version in the systray I get 3.5.21.40 and it's the same as I have set up in the project as the device. All information I get is that it should be clear from the errors but no useful information is provided in the errors. Do I need to install some library? I checked other posts and for different reference error and this was the answer. Thanks in advance!
Last updated: 2026-03-25

Post by nulltrace on How change Unity-ID in TCP Modbus Slave ^{CODESYS Forge talk (Post)}
Hey Husarz, thanks for your Message, now i understand your Problem, also able to reproduce that. Pls. give me a Short Time to Check some stuff on this, i'll come back to this Topic with news ASAP. Greetings
Last updated: 2026-04-03

Post by struland on Sysfile Konfiguration ^{CODESYS Forge talk (Post)}
Bei mir half: [SysFile] IecFilePath=/mnt/sdcard Allerdings ist es kein Raspi. Den Ordner, der gelesen werden soll mal auf korrekte Zugriffsrechte prüfen. Im Falle das SELinux aktiv ist mit ls -lZ, ansonsten ls -al
Last updated: 2026-04-13

Post by struland on Sysfile Konfiguration ^{CODESYS Forge talk (Post)}
Bei mir half: [SysFile] IecFilePath=/mnt/sdcard Allerdings ist es kein Raspi. Den Ordner, der gelesen werden soll mal auf korrekte Zugriffsrechte prüfen. Im Falle das SELinux aktiv ist mit ls -lZ, ansonsten ls -al
Last updated: 2026-04-13

Post by nulltrace on How change Unity-ID in TCP Modbus Slave ^{CODESYS Forge talk (Post)}
Hey, I also waiting for feedback from Mr. Schwellinger @eschwellinger, please send me an answer, i would appreciate it. The clue is, i know the solution, but have to check if it's allowed to share.
Last updated: 2026-04-14

Post by reinier-geers on Resize and position Numpad/Keypad ^{CODESYS Forge talk (Post)}
HI, I download the scale dialog. But cant find were i can Set the size of the dialogs. only the position. I want the diolog bigger
Last updated: 2026-04-15

Post by husarz17 on How change Unity-ID in TCP Modbus Slave ^{CODESYS Forge talk (Post)}
Good to know there's a solution to this problem. I hope you'll be able to share it with me. I can't wait to hear about it.
Last updated: 2026-04-20

Post by malie on Issue with library updates ^{CODESYS Forge talk (Post)}
Hello, i got the same problem, but on my site it started with version 3.5.21, with version 3.5.19.7 it worked like a charm. How get the old behavior back? Or how to reload the librarys in an open project/library manually?
Last updated: 2026-04-24

Post by reinier-geers on Network variable stops sending ^{CODESYS Forge talk (Post)}
What version. 20.5 ? ive got also problems wiyth that version. Online change, it hangs itself after one hour. Then one project can problems. Ive change display with 21.0 . At home i turned on the 20.5 display. After 1 hour i goes to stop.
Last updated: 2026-05-06

Post by alex-n on Problem with keeping up the distance between two axes ^{CODESYS Forge talk (Post)}
We use Inovance AC802 as PLC, IS810N Drive, library 4.10, connection via Ethercat and no any suprise at work.
Last updated: 2026-06-02

Whether You’re New to Nursing or a Seasoned Pro, Grasping the Basics of NURS FPX 4055 Assessment 1 Offers Many Benefits ^{CODESYS Forge talk (Thread)}
Whether You’re New to Nursing or a Seasoned Pro, Grasping the Basics of NURS FPX 4055 Assessment 1 Offers Many Benefits
Last updated: 2026-06-13

Post by patrik on Wish: CODESYSControl.cfg - again ^{CODESYS Forge talk (Post)}
Really good post. I hope that it gets seen by CoDeSys staff. I often find the documentation lacking when it comes to using CoDeSys in more complex ways. If using standard "basic PLC functionality", then it's fine and functions are documented in a sufficient way. Once you go outside of that bubble then I find the documentation not enough. CODESYSControl.cfg is a good example of this. And why isn't more of this integrated in the IDE. like changing port of the webserver. Why is it hidden in this file and not accessible through the IDE. It feels like a layer of complexity purposely left in so you don't change it if you don't know what you are doing. Like the argument is if you have the know-how to find the file you have the know-how to edit it. I find the documentation lacking when it comes to more complex libraries too. Like the element collections library. there is parameters I still don't quite know what they do. I can't find any documentation about them. There is an example project to download from CoDeSys so you can see how you are supposed to set your factories up. I leave some parameters like it is in the example. Should I? I don't know. Does it work. Yes. But I could perhaps create memory leaks if I get something wrong and I don't see that until way later. In the create method of your element factory you have a function called __vfinit and you just have to accept that it works. Why can't I get insight in what it does through documentation? Don't CoDeSys want us to know how these work so we can't use them to accidentally break something? I find the error logging lacking too. I've had the CoDeSys service crash but it doesn't say why. I've seen windows noticing the crash but no error code was sent or error message. Also in my current issue where the application fails to start after power outage. I can see in the log that it fails to load retain in the application as one log entry and application failing to start as another. But why? Why does loading the retain fail? give me more information! Is it just a skill issue with me? I don't know. If it is then I'd still want CoDeSys to step up their game when it comes to documentation. I'm sorry if a lot of frustration comes though in this post. I really like the product and what I can do with it compared to other PLC brands.
Last updated: 2024-11-21

Post by sahin6033 on DSE M840-001-02: DSEServiceTool transfers CodesysApp.pkg successfully, but device shows “No application loaded ^{CODESYS Forge talk (Post)}
Hi, I am trying to load a test application into a DSE M840-001-02 display, but after reboot the device still shows: “No application loaded” I would like to understand whether the problem is in my project, the package creation process, or firmware/runtime compatibility. Hardware Device: DSE M840-001-02 Firmware used: M840 MKII Firmware File v4.1.2 Software CODESYS V3.5 SP12 (32-bit) DSE CODESYS Package v1.5.44 DSEServiceTool What I did Created a new empty Standard Project Selected target/template: M840-02 V4.1 Used a minimal ST program only: PROGRAM PLC_PRG VAR xAlive : BOOL := TRUE; END_VAR Confirmed: project builds PLC_PRG is assigned to MainTask created Boot Application Generated CodesysApp.pkg Put the M840 into bootloader mode Sent the package using DSEServiceTool DSEServiceTool result Transfer completes successfully and I get: connection accepted 100% download package ACK <status>OK</status> ** Example log:** Searching for controllers.... sendPackageToController: waiting for incoming data connection... sendPackageToController: connection accepted... <status>Downloading</status> <percent>20</percent> <percent>40</percent> <percent>90</percent> <percent>100</percent> sendPackageToController: sent 112cb8 bytes OK Package ...\CodesysApp.pkg transferred to controller c0a80101 OK sendPackageToController: package ACK <status>OK</status> Actual result After reboot, the display still shows: “No application loaded” Additional issue I also saw earlier At one stage I also had these fatal errors in CODESYS: [FATAL ERROR] Unresolved reference: 'IOMGRLOCKENTER' [FATAL ERROR] Unresolved reference: 'IOMGRLOCKLEAVE' I checked library versions and adjusted them to: IoDrvBase = 3.5.5.0 IoStandard = 3.5.10.0 Also, I am using CODESYS SP12, which I understand is the correct version for DSE M840. My questions If DSEServiceTool shows Status OK and package ACK, but the device still says “No application loaded”, does that mean: the .pkg was transferred but not accepted as a valid application? the package was built incorrectly? the boot application / runtime / firmware versions are still mismatched? What is the correct procedure to generate CodesysApp.pkg for M840-02 V4.1? Is there any known compatibility issue between: DSE CODESYS Package 1.5.44 M840 MKII Firmware 4.1.2 CODESYS 3.5 SP12 Has anyone successfully loaded even a minimal empty test project into M840-001-02, and if so, what exact versions/process did you use? Any help would be appreciated.
Last updated: 2026-03-17

Post by steven-schalm on Github Actions CI/CD tasks - development topic ^{CODESYS Forge talk (Post)}
hello kevinrn, I've been looking for a solution to the CI/CD issue for a long time. Briefly about me... I am 32 and software architect for Codesys V3 and fullstack dev for web (VueJS, NestJS) in a small company in Erfurt (Germany). https://www.rex-at.de/. Through my web part, we already have CI/CD running well via GitLab (YAML-based configuration file (.gitlab-ci.yml), which defines which pipelines and jobs are executed when certain events occur) with everything you know. Stages for npm packages - prepare (GitVersion, npm install or whatever) - build (vite, tsc or whatever) - testing (vitest, jest or whatever) - deploy (npm packages) And similar for monorepo's or backend services (in NestJS) as DockerImages. For Codesys we have been building an OOP framework for years (~50 libraries now), which is currently managed via SVN and a specially written Svn-Watcher (in Python) gets commits and runs and builds everything together and deploys it to an FTP server and network drive. Why do we still have SVN? Because we are unfortunately still tied to the safety integration of Codesys and can therefore only go to SP15 at most with our controller/Eckelmann. But soon there will be an update and there will be no more obstacles to using Git. Hence my questions: 1. the basic idea is to run a local Windows Runner on some machine? 2. install Codesys on the machine where the runner is running? 3. powershell & python scripts are then used to execute builds (compile, build, sign libraries) & deploys? 4. can the Github action also be used in GitLab? ChatGPT has already told me that it's not the same, but it doesn't hurt to ask. Do you have any ideas on this? Greetings :D
Last updated: 2024-08-20

Post by toffeebonbon on Die richtige CODESYS-Runtime auf dem Raspberry Pi ausrollen (3.5 SP18) ^{CODESYS Forge talk (Post)}
Guten Morgen, wie der Titel verrät soll es hier um das Ausrollen der CODESYS Runtime auf einem Raspberry Pi gehen. Ob ein klassischer Raspberry Pi aus dem Consumer-Bereich oder ein Compute-Modul spielt in dem Fall keine Rolle. Ich möchte nur anderen Nutzern Hilfestellung geben, die vielleicht ein vergleichbares Problem haben wie ich: Auf Raspberry Pi lief bei mir eine Anwendung, die mit Lizenzen auf einem CODESYS-Dongle lizenziert waren (Multicore-Support und Softmotion). Nach einem Hardware-Defekt habe ich meinen Rasperry Pi gegen eine robustere Lösung getauscht. Ich wollte auf der neuen Hardware die Runtime ausrollen und habe ständig den Fehler gezeigt bekommen, dass die Target- oder Zielsystem-ID nicht stimmt. Für den Raspberry Pi gibt es ja drei verschiedene Optionen der Runtime: 32bit Singlecore (armv6l) 32bit Multicore (armv7l) 64bit Multicore (aarch64) Entscheidend dafür, ob die 32 oder 64 Bit Runtime benötigt wird ist das auf der dem Raspberry Pi installierte Betriebssystem. In meinem Fall hatte ich durch die neue Hardware auch ein aktuellen Betriebsystem-Image aufgespielt, weshalb sich da der Umstieg von 32 auf 64Bit eingeschlichen hatte. In der Entwicklungsumgebung kann über Tools -> Control SL ausrollen das Fenster geöffnet werden, um die richtige Laufzeitumgebung auf dem Steuerungsrechner zu installieren. Bei kleinen Bildschirmen (bei mir ein 15" Laptop) kann der rechte Bereich "abgeschnitten" und das Dropdown-Menü als solches nicht auf den ersten Blick erkennbar sein. Mein Fehler war, dass ich den Scrollbalken nicht gesehen habe! (Bild im Anhang mit freundlicher Genehmigung von Herrn Heberle vom CoDeSys-Support) Nach dem auswählen der jeweils passenden Version kann die Runtime installiert und das Programm wieder geladen werden. Die Lizenzen sind bei mir wieder korrekt erkannt worden und alles läuft wie vorher (nur mit neuer Hardware). Vielen Dank an der Stelle noch mal an die schnelle Hilfe vom Support. Das hat wirklich top funktioniert.
Last updated: 2025-02-27

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 micik on Using Codesys example problems ^{CODESYS Forge talk (Post)}
Hello to all, I'm totally new to Codesys, but I do have some PLC programming experience, mosty with Siemens TIA and STEP7. I have just installed Codesys 3.5. sp19 and I have downloaded example with Ethernet Rockwell 1734AENT. The example can be found here: https://forge.codesys.com/prj/codesys-example/rockwell-1734-c/home/Home/ After opening, I had to manually update devices (Device, Ethernet, IP Scanner, EthernetIP adapter). However, when trying to build the project, I get the following errors: [WARNING] CODESYS_EtherNetIP_Rockwell1734AENT: Library Manager [Device: PLC Logic: Application]: C0100: Library System_VisuElemXYChart has not been added to the Library Manager, or no valid license could be found [WARNING] CODESYS_EtherNetIP_Rockwell1734AENT: Library Manager [Device: PLC Logic: Application]: C0100: Library system_visuinputs has not been added to the Library Manager, or no valid license could be found [ERROR] iodrvethernetip, 4.4.1.0 (3s - smart software solutions gmbh): ServiceCycle [IoDrvEtherNetIP]: C0040: Function 'ProcessUpdateConfigurationQueue' requires exactly '1' inputs [ERROR] iodrvethernetip, 4.4.1.0 (3s - smart software solutions gmbh): IoDrvStartBusCycle [IoDrvEtherNetIP]: C0040: Function 'GenerateRandomUINT' requires exactly '2' inputs [ERROR] iodrvethernetip, 4.4.1.0 (3s - smart software solutions gmbh): Cyclic [GenericServiceUnConnected]: C0040: Function 'GenerateRandomUINT' requires exactly '2' inputs [ERROR] cip object, 4.4.1.0 (3s - smart software solutions gmbh): ForwardOpenService [ConnectionManager]: C0040: Function 'GetAssemblies' requires exactly '3' inputs [ERROR] iodrvethernetipadapter, 4.4.0.0 (3s - smart software solutions gmbh): ServiceCycle [IoDrvEtherNetIPAdapter]: C0040: Function 'GenerateRandomUINT' requires exactly '2' inputs [ERROR] iodrvethernetip, 4.4.1.0 (3s - smart software solutions gmbh): SetupStructuredIOMapping [RemoteAdapter]: C0040: Function 'MallocData' requires exactly '1' inputs [ERROR] iodrvethernetip, 4.4.1.0 (3s - smart software solutions gmbh): SetupStructuredIOMapping [RemoteAdapter]: C0040: Function 'MallocData' requires exactly '1' inputs Compile complete -- 7 errors, 13 warnings Build complete -- 7 errors, 13 warnings : no download possible! What could be the reason for this errors and how to rectify them? Thank you!
Last updated: 2024-02-01

Post by gilad on CODESYS SoftMotion Generic DSP402 on WAGO PFC200 + Festo CMMT-AS: MC_Power stays Busy, Controlword remains 0 ^{CODESYS Forge talk (Post)}
Hello, I am trying to connect a Festo CMMT-AS-C4-3A-MP-S1 servo drive to a WAGO PFC200 (750-8210) using EtherCAT and CODESYS SoftMotion. Hardware PLC: WAGO PFC200 750-8210 Drive: Festo CMMT-AS-C4-3A-MP-S1 Communication: EtherCAT CODESYS version: Device description version 6.3.1.1 Drive firmware: 36.10.3 Current Status EtherCAT communication is working correctly: EtherCAT master = Running Drive detected and operational PDO input and output mapping is active Statusword, position and velocity are updating correctly Current PDO mapping: Outputs: 6040 Controlword -> %QW0 6060 Modes of operation -> %QB2 607A Target position -> %QD1 60FF Target velocity -> %QD3 Inputs: 6041 Statusword -> %IW2 6061 Modes of operation display -> %IB6 6064 Position actual value -> %ID2 606C Velocity actual value -> %ID3 SoftMotion Axis I added a SoftMotion CiA402 axis under the EtherCAT slave: Axis type: SM_Drive_GenericDSP402 Axis communication state: operational (100) No SoftMotion mapping errors anymore Problem MC_Power is executed with: Enable = TRUE bRegulatorOn = TRUE bDriveStart = TRUE but: Status = FALSE Busy = TRUE Error = FALSE ErrorID = SMC_NO_ERROR The axis remains in: SMC_AXIS_STATE.power_off DSP402 state = SWITCH_ON_DISABLED The most important observation: Statusword = 32784 (0x8010) Controlword (%QW0) remains 0 all the time SoftMotion never writes 6, 7, or 15 to the Controlword. Additional Information The axis status page reports: "The license is missing or invalid. The PLC runs in demo mode." I am not sure whether: The missing SoftMotion license prevents Controlword generation completely. The axis is still not correctly connected to the EtherCAT slave despite operational communication. There is an additional CiA402 configuration step required for the Festo CMMT-AS drive. Has anyone successfully used a Festo CMMT-AS MP drive with CODESYS SoftMotion Generic DSP402 on a WAGO PFC200? Any suggestions on what should be checked next would be greatly appreciated.
Last updated: 2 days ago

Post by kevinl on Weidmüller und u-OS bugs ^{CODESYS Forge talk (Post)}
Hallo zusammen Wir setzen mehrere Weidmüller UC20-WL2000 mit CODESYS Runtime und System-Bus ein und kämpfen seit einiger Zeit mit Problemen, für die wir bisher keine Ursache finden konnten. Aktuell beobachten wir zwei Phänomene: System-Bus Probleme Bei einer Anlage verlieren die I/O-Module sporadisch die Verbindung. Im Log erscheinen Meldungen wie: SLIO:CheckModule missing NotReachable Module Unplugged Nach diversen Updates (u-OS 2.7, aktuelle Runtime, aktuelles CODESYS) wurde das Verhalten eher schlechter statt besser. Anfangs traten die Fehler sporadisch auf, inzwischen funktioniert der System-Bus teilweise gar nicht mehr. Auch ein Downgrade auf eine ältere u-OS Version half nicht wirklich, aber ev ist es mit der aktuellen Runtime nicht kompatibel. Probleme nach Spannungsunterbruch / Neustart Mehrfach hatten wir bereits den Fall, dass eine Steuerung nach einem Spannungsunterbruch oder Neustart nicht mehr vollständig hochkommt. Teilweise startet die CODESYS Runtime nicht mehr (vermutlich aufgrund von Problemen mit Persistent-Daten), in einem aktuellen Fall ist zusätzlich das u-OS Backend nicht mehr erreichbar. Die Welcome-Seite erscheint noch, beim Login läuft der Request jedoch in einen 504 Gateway Timeout. Hardware: UC20-WL2000 u-OS 2.x System-Bus mit mehreren UR20 Modulen CODESYS Control SL Runtime Mich würde interessieren: Hat jemand ähnliche Erfahrungen mit UC20-WL2000 oder u-OS gemacht? Gibt es bekannte Probleme mit dem System-Bus? Gibt es Workarounds bezüglich Persistent-Daten oder Recovery nach Spannungsunterbruch? Hat jemand ähnliche 504-Fehler im u-OS Backend gesehen? Vielen Dank für jeden Hinweis.
Last updated: 2026-06-05

Post by dantheman on Connecting to SoftPLC Only Works By Turning Off Modbus Ethernet Port ^{CODESYS Forge talk (Post)}
I have an IPC with 2 ethernet ports and 1 Wi-Fi. I'm using ModbusTCP with the ethernet port named "enp2s0" connected to my remote I/O. This works fine when testing with Python and also works with CODESYS, but CODESYS is only able to scan for the Linux SoftPLC when I turn off the "enp2s0" interface. In other words, I can't get online with the IDE if I want my ModbusTCP comms to run with CODESYS. I'm using a Linux SoftPLC that has the following entry in CODESYSControl.cfg, hoping that this will allow me to connect with "enp1s0" or "wlp3s0", and leave "enp2s0" for field comms, but this seems to only make the source IP of the ModbusTCP comms to be bound to "enp2s0". That last point is the case only if I don't restart the service, but if I do restart the service after changing the config file, the source IP for the ModbusTCP comms then becomes the one for "enp1s0", which is very confusing to me: [SysSocket] Adapter.0.Name="enp2s0" Adapter.0.EnableSetIpAndMask=1 On the device list, I only have "enp2s0" given as the ethernet device that has the ModbusTCP master & slave beneath it, shown in Screenshot 1. On the IPC, I can ping the ModbusTCP client (remote I/O) from "enp2s0", and I've attached a Wireshark capture of running ModbusTCP from the CODESYS runtime as Screenshot 2, 3 & 4 (again, I can't get online when this is running, I have to turn off "enp2s0" to connect even when it's idle and I don't have an active TCP session with my Python tests). Like I explained above, the source IP is "enp1s0", even though the ethernet device on the project is "enp2s0". I was lucky to catch the red message that showed the source IP that makes sense to me (the one for "enp2s0"), but for some reason that connection was reset and I never saw that packet again. I've also tried this with Auto-reconnect both enabled & disabled, for the ModbusTCP Master device. I also have to turn off "enp1s0" and then turn it on, just so that I can have the ModbusTCP comms running from "enp2s0" (which is not intuitive in any way to me, I'd love some help understanding that phenomenon as well) in the weird manner that I've described above. I would be very appreciative if someone can help me figure out this pickle. I'd love to just connect to CODESYS through my Wi-Fi interface and leave my ethernet ports for field comms.
Last updated: 2024-08-01

Post by madskaizer on Task Priority Documentation? ^{CODESYS Forge talk (Post)}
Hi All I was watching the Wago PFC300 webinar ( https://www.wago.com/global/lp-thank-you-onlineseminar-pfc-300 ), and the presenters comment about priority 1 being way above the Ethernet task priority, so that a priority 1 PLC program can actually loose SCADA connection, made me try to round up some hard evidence on Codesys Priorities. I find there is very little information on "correct" task priority configuration. There is a lot of different hardware manufacturers, using Codesys Runtime, that has different descriptions in their manuals on how to set up priority. https://doku.amk-motion.com/en/Subsystems/PDK_202975_A-Serie_en/Content/Projekt/AMKAMAC/PDK_202975_A4-A5_Produktbeschreibung/Funktionalitaet/PLC-Programming/PLC%20Tasks.htm?TocPath=PLC-Programming%7C_____7 https://product-help.schneider-electric.com/Machine%20Expert/V1.1/en/SoMProg/index.htm?#t=SoMProg%2FTask_Editor%2FTask_Editor-7.htm&rhsearch=priority&rhhlterm=priority&rhsyns=%20&SUBSTRSRCH=1 https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_f_task_configuration.html So my questions :) 1) If there is only 1 PLC_PRG task, does priority matter? 2) What is the priority of Ethernet / communication, if nothing is entered? 3) What is the priority of Codesys OPC UA server? 4) Some users here on forge mentions that Wago PLC programs should run as priority 11, but where does this recommendation origin from? 5) What are you recommendations for a relatively slow process, like building automation? It uses OPC UA for communication to SCADA, maybe some MODBUS-RTU and MODBUS-TCP, usually around 100 I/O, been running with everything in a single task at priority 1, 50-100ms cycle time. Some controllers have separate MODBUS tasks, but doesn't seem like a big difference. How would you recommend splitting up communication, IO fieldbus and programs into differently prioritized tasks? I know its a complex matter and all about my application, but I really miss there was just some kind of guidance in the documentations and with all new standard Codesys programs having priority 1 as default, makes it seem less important, than it really is.
Last updated: 2025-08-11

Post by kurtk on SysProcess Execute Command unable to run commands with special characters ^{CODESYS Forge talk (Post)}
Thank you for this additional information. Could you please provide the references to the official documentation where you found this information ? I got as far as: Then insert this: [SysProcess] BasePriority=Realtime Command=AllowAll devoid of references of where the CodesysContol.cfg file was located or of the need to run codesys as root I incrementally located bits of information with perplexity searches but remained mired at error 25 ERR_NO_ACCESS I am curious whether root access is MANDATORY to run SysProcessExecuteCommand (- and/or any other SysProcess functions) or if a more access-constrained User=quasiroot could suffice without the security concerns ? Apparently codesys runs fine without User=root for almost everything... That raises the question: What IS the default codesys user ? I notice in the prototypes: VAR sCommand : STRING := '/usr/bin/whoami'; sOutput : STRING(255); refCommand : REFERENCE TO STRING; refOutput : REFERENCE TO STRING; resultCmd : UDINT; END_VAR whenever I attempt to build this Codesys v3.5 SP2 whines that "cannot convert type REFERENCE TO STRING to STRING" don't remember the exact message... Apparently this happens whenever a fixed-length string is involved. if I get rid of (255) and just set the string := ' '; that is sufficient to make the compiler happy. Is this a recently enforced constraint ? Why does this compile for you and not for me ? There are references to functions / utilities which are used/needed to massage the string references - but I see no specific details... I also notice you specify: Make sure the lib SysProcessImplementation, SysTypes, and CmpErrors is on the project. I don't comprehend why all of the dependent libraries are not automatically referenced, added ? I don't recall seeing anywhere but here that SysProcessImplementation must be included... It just seems odd that the default is to exclude essential libraries, or require alchemical conjuring to assemble all the ingredients for gnat soup ;-) Thanks a lot... I'm still a codesys newby getting my wheels on - or sometimes just partially on
Last updated: 2025-09-12

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