Post by sheberle on ERROR: Calling the program "AlarmStorage_Prg" is not allowed from multiple tasks ^{CODESYS Forge talk (Post)}
Do you have any additional information about when the error occurs? I am trying to recreate this issue to find a workaround... Maybe you could also make the project available. You could add the following logfilter to the CODESYS configuration file: [CmpLog] Logger.0.Filter=0xFFFFFFFF Logger.0.Enable=1 Logger.0.MaxEntries=10000 Logger.0.MaxFileSize=1000000 SysSem.Filter=0xFFFFFFFF SysTask.Filter=0xFFFFFFFF I hope that the log filter will show us which task is responsible for this, so we can narrow it down a bit more.
Last updated: 2026-03-31

Post by josepmariarams on Limit Axis CNC Jerk using SMC_Polynomial_AbsMaxLocs ^{CODESYS Forge talk (Post)}
Dears. Until now, I have been using CNC libraries with Codesys 3.5SP11. I was using SMC_Polynomial_AbsMaxLocs function, from CNC library, to calculate the axis jerks, interpolating splines, to limit it. Now I have passed to SP20, and the functions which calculates the zeros and the maximum-minimum and zeros of polynomials has been disapeared. Questions: -Exist any FB wich can limit the jerk of individual axis in CNC? -Exist any other functions which can calculate max-min and zeros of polynomials? Thanks
Last updated: 2026-05-22

Post by leag on Reset device password Festo PLC ^{CODESYS Forge talk (Post)}
Hi, I am new to CODESYS, and I want to program a new FESTO, but I am getting this authentication screen. I don't remember the password. I tried with Administrator/Administrator and some other defaults I found online but nothing works. I also tried searching for CODESYSControl_User.cfg and many other recommended directories but I dont seem to have any of them (like CODESYSControlWinV3x64) Could you please help me understand what I need to reset? Thanks a lot
Last updated: 2026-08-12

Post by jgalaska on SMC_Trafo 6DOF Config Error ^{CODESYS Forge talk (Post)}
Hello, Recently I was trying to run 6DOF robot in codesys via SMC_Trafo_ArticulatedRobot_6DOF, unfortunately no matter what parameters I tried, it always outputs InvalidConfig Error. I saw the same issue in a topic: https://forge.codesys.com/forge/talk/Motion/thread/16e1f0327f/ But if I understand correctly, the user solved it by developing his own version of this block. I wanted to know if it is a bug in the library (SM3_CNC 4.20.0.0) or am I doing something wrong? Can anyone confirm that they can use the FB without it reporing the Error? Kind regards,
Last updated: 2026-01-21

Post by gland on Open project automatic with correct version ^{CODESYS Forge talk (Post)}
Goodmorning, The projects we have made (with several persons) are in differents versions, Codesys V3.5 sp18 patch4, V3.5 sp19 patch 2, V3,5 sp19 patch 5 etc V3.5 sp21 patch 3 etc.. Now when we're opening an project thats's not opend before on my pc and we're not sure in witch version it's made it's quite annoying. We don't want to update to the newest version. Is there a way that it's automatic opening the correct version? Is there a program/tool/easy way to do this? Thanks,
Last updated: 2026-01-27

Post by fleaplc on CPU + EtherCAT redundancy ^{CODESYS Forge talk (Post)}
Hi all, for a new project I'm looking for a redundant controller with EtherCAT fieldbus I/O. Actually I'm using Beckhoff and it works great! but there's not a solid redundancy yet... Does someone get experience for industrial application (not raspberry) for a redundant Codesys system? If yes please share some info (CPU / OS type, bus, number of managed I/O,... and especially feeling feedback (stability, bugs, performance)... Every suggestion is kindly appreciated!! Fabrizio
Last updated: 2026-01-27

Post by nz-dave on *exception* [processorloadwatchdog] occurred in: app=[all], task=[all] ^{CODESYS Forge talk (Post)}
Can anyone shed some light on this issue im having. at random, sometimes days, sometimes weeks or months. i get this error and have to reset the plc. Im using a Weintek HMI with ethernet/ip remote io and vsd. i have tried increasing my task times and watchdogs. and when i view my PLCload in the shell its normally around 3-4%, highest ive ever seen is 7%. Nothing i do seems to help the issue. Could the HMI's Codesys CPU be getting to hot do to high ambient temp?
Last updated: 2026-02-01

Post by winki on Error in licence activation ^{CODESYS Forge talk (Post)}
Hello, Despite receiving an activation message after entering the license number, I don’t have any license installed on my gateway. I went to check in /var/opt/codesys/ and there is no License file. I searched the entire gateway for a .lic file and found no license. I’m really stuck—how can I fix this, please? When I am using the licence tools I got this picture: But nothing that have been activated. Loic,
Last updated: 2026-02-03

Post by winki on Error in licence activation ^{CODESYS Forge talk (Post)}
Hello, Despite receiving an activation message after entering the license number, I don’t have any license installed on my gateway. I went to check in /var/opt/codesys/ and there is no License file. I searched the entire gateway for a .lic file and found no license. I’m really stuck—how can I fix this, please? When I am using the licence tools I got this picture: But nothing that have been activated. Loic,
Last updated: 2026-02-03

Post by alexgooi on No Bootproject possible ^{CODESYS Forge talk (Post)}
Dear Forum, When using a online-change I often get the following message: No Bootproject possible in this state: application out of memory. Perform full download first. I'm using Codesys virtual control for linux SL running on a docker server with plenty of memory available, therefore I’m not expecting a hardware limitation. Is there a setting available to for example reserve more memory, so the controller is not that quick out of memory? thank you in advance. Alex
Last updated: 2026-03-27

Post by confre on Combo box drop-down invisible ^{CODESYS Forge talk (Post)}
Hi, I created a combo box and I need to know when the drop‑down menu is open, in order to avoid hiding the combo box while the drop‑down is visible. Alternatively, if it’s not possible to detect whether the drop‑down is open, I would like to know how to close or hide the drop‑down programmatically when the combo box is made invisible. I'm using Codesys 3.5 SP19 on IFM CR1074 without touch screen (with standard keyboard handling) Thanks.
Last updated: 2026-04-09

Post by struland on OPC UA Codesys 3.5 Symbolkonfiguration VS Kommunikationsverwalter und Python/UA-Expert ^{CODESYS Forge talk (Post)}
Hallo mattplc, man kann das Leid mitfühlen. OPC UA verspricht immer so viel. Aber wenn es um die praktische Umsetzung geht, und man damit die Aufgabe "schicke Daten von A nach B" lösen möchte, trifft man unvermutet auf den Endgegner. Der Mega-Bösewicht der Komplexität und Kompliziertheit. Was Dein Problem angeht, vermute ich mal das es mit dem Thema "Informationsmodell" zusammenhängt. Viel Erfolg auf Deiner Reise ✊✊✊
Last updated: 2026-05-22

Post by fabiodasilveira on Static Analysis Error SA0026 ^{CODESYS Forge talk (Post)}
Hello Everyone, I am really struggling to understand why codesys would present an error regarding the following: VAR strByte1: STRING(10):= '192'; strByte2: STRING(10):= '168'; strByte3: STRING(10):= '1'; strByte4: STRING(10):= '0'; strIPAddress: STRING:= '192.168.1.1'; END_VAR //Updating Variables strByte1:= BYTE_TO_STRING(GVL.abyPSsIpAddress[0]); strByte2:= BYTE_TO_STRING(GVL.abyPSsIpAddress[1]); strByte3:= BYTE_TO_STRING(GVL.abyPSsIpAddress[2]); strByte4:= BYTE_TO_STRING(GVL.abyPSsIpAddress[3]); strIPAddress:= CONCAT(strByte1, CONCAT('.', CONCAT(strByte2, CONCAT('.', CONCAT(strByte3, CONCAT('.', strByte4)))))); Any help would be much appreciated.
Last updated: 2026-07-27

Post by dmb-fan on Attemp Convert old V2.3 projects : Error HRESULT: 0x80010105 (RPC_E_SERVERFAULT)) ^{CODESYS Forge talk (Post)}
I had runnig this already. Then I updated to SP22 patch3. After that I got always this error: ===== Project importieren: XXXXnameYYYYYY ===== *[FATALER FEHLER] Fehler beim Import des Projekts: Ausnahmefehler des Servers. * [FATAL ERROR] Error importing the project: Server exception. (Exception to HRESULT: 0x80010105 (RPC_E_SERVERFAULT)) I delete the version and installed again. Same. I uninstalled all CoDeSys on the PC and installed the old SP22 patch2 new. Same error by opening old projects. Immediatly, not by converting. Convert V3.5.17 was always installed. What is happening or what can I do?
Last updated: 2026-08-11

Post by nixola on Exception handler return value purpose in _CODESYS 3.5 ^{CODESYS Forge talk (Post)}
Hi, I was trying to figure out how to correctly handle system exceptions in a CODESYS project, but either the documentation falls short, or I'm unable to find the proper docs. I know I can register a function as an exception handler via Task Configuration > System Events > Add Event Handler, which will create a function with the correct interface; I am, however, unable to figure out what the returned DWORD is supposed to be, if anything. Is the interface for the exception handler documented and, if so, where can I find it?
Last updated: 2026-08-31

Post by tarek on How to add/Scan devicenet Master/Slave ^{CODESYS Forge talk (Post)}
Hello, i have a similar problem with this. Im using an EL6752 from Beckhoff DeviceNet Master and i dont have an EDS for the comms with the slave (EVO GT II Valve). In CODESYS they dont let me put a digital slave. My question, how can i add a slave in the EL6752 the Process data mapping to see values. I cant add a DeviceNet slave in the tree, thanks
Last updated: 2026-09-14

Post by brouwyka on JSONByteArrayWriter string result incorrect order ^{CODESYS Forge talk (Post)}
Hello everybody! We are currently working on implementing a call to an API that tracks data sent to it through a JSON body. Versions: CODESYS V3.5 SP19 Patch 7 using IIOT Libraries SL license, specifically JSON Utilities SL version 1.13.0.0. For simplicity, let's say we want to construct the following JSON body for our request (simplified to just 1 key-value pair in each of the array objects to keep things shorter, but we'd have multiple fields in each in reality): { "id": "machine_1", "readings": [ { "temp_mid": 153.8 }, { "temp_mid": 98.3 } ], "status": "RUNNING" } However, our "readings" data is added over time, not in creation, so calls to the builder would be somewhat out of order. In a simplified manner, our calls would look like this: jsonBuilder(pJsonData := JsonData, diRootObj => rootJsonIndex); // rootJsonIndex = 0. // Set "id" at root JSON object. wsValue := "machine_1"; jsonBuilder.SetKeyWithValue("id", wsValue, diParentIndex := rootJsonIndex); // JSONData KEY: diParentIndex = 0 & diIndex = 1, VALUE: diParentIndex = 1 & diIndex = 2. // ... Time passes, we get our first reading to add ... // The "readings" array does not exist yet, so we make it first at root JSON object before adding our first reading. readingsJsonArrayIndex := jsonBuilder.SetKeyWithArray("readings", diParentIndex := rootJsonIndex); // JSONData KEY: diParentIndex = 0 & diIndex = 3, VALUE: diParentIndex = 3 & diIndex = 4. // Then add the first reading, for which we first have to make an object. readingsJsonArrayObjectIndex := jsonBuilder.SetObject(diParentIndex := readingsJsonArrayIndex); // JSONData OBJECT: diParentIndex = 4 & diIndex = 5. // And then we add the field(s) in the object for the first reading. // NOTE the use of `readingsJsonArrayObjectIndex` so we set the field(s) in the first object in the array. rValue := 153.8; jsonBuilder.SetKeyWithValue("temp_mid", wsValue, diParentIndex := readingsJsonArrayObjectIndex); // JSONData KEY: diParentIndex = 5 & diIndex = 6, VALUE: diParentIndex = 6 & diIndex = 7. // ... Time passes, we want to add another root-JSON-level field ... // Set "status" at root JSON object. wsValue := "RUNNING"; jsonBuilder.SetKeyWithValue("status", wsValue, diParentIndex := rootJsonIndex); // JSONData KEY: diParentIndex = 0 & diIndex = 8, VALUE: diParentIndex = 8 & diIndex = 9. // ... Time passes, we want to add a second reading ... // "readings" array exists, so add the second reading, but first we have to make another object. // NOTE the re-use of the earlier stored `readingsJsonArrayIndex`, so we add the new object to that previously created array. readingsJsonArrayObjectIndex := jsonBuilder.SetObject(diParentIndex := readingsJsonArrayIndex); // JSONData OBJECT: diParentIndex = 4 & diIndex = 10. // And then we add the field(s) in the object for the first reading. // NOTE the use of `readingsJsonArrayObjectIndex` so we set the field(s) in the SECOND(, new) object in the array. rValue := 98.3; jsonBuilder.SetKeyWithValue("temp_mid", wsValue, diParentIndex := rootJsonIndex); // JSONData KEY: diParentIndex = 10 & diIndex = 11, VALUE: diParentIndex = 11 & diIndex = 12. // ... Finally, we want to send to the API, so we must convert the builder to data the client accepts as a body ... xTestWriteToJsonArray := TRUE; jsonArrayWriter( xExecute := xTestWriteToJsonArray, pwData := ADR(jsonDataString), udiSize := SIZEOF(jsonDataString), jsonData := JsonData^ ); IF jsonArrayWriter.xDone THEN // The writer was successful, the `jsonDataString` VAR should now contain a WString copy of the JSON object from the builder. xTestWriteToJsonArray := FALSE; END_IF We see that the JsonData STRUCT is correctly organised (in terms of the diParentIndex & diIndex set by it for each JsonElement) as we expect, as outlined in my comments in the simplified code above. However, as soon as we pass it to the jsonArrayWriter (which is a JSON.JSONByteArrayWriter), the resulting jsonDataString does not match our expectations, instead coming out like this: { "id": "machine_1", "readings": [ { "temp_mid": 153.8 } ] } { "temp_mid": 98.3 } "status": "RUNNING" The behaviour of the JSONByteArrayWriter thus seems to be the problem here. It does not seem to correctly process the children of JsonElements that are ARRAYs when additions to them are done broken up by additions to the lower level JSON OBJECT they are a part of. We have confirmed this by changing the order of the calls in our example to add both readings before adding the "status", in which case we get our expected outcome. However, in reality this is not possible for us - additions to any of the JSON's objects, arrays or array objects may happen at any time after other fields elsewhere in the JSON have been added. Does anyone know a way around this, a fix, or knows a solution we simply have not found? This same phenomenon was also noted on this forum by user @ryusoup at the end of 2023 (https://forge.codesys.com/forge/talk/Engineering/thread/c45929e2f1/#e27f) and user @mtho in early 2024 (https://forge.codesys.com/forge/talk/Engineering/thread/cd1bb450db/#1292) but both topics received no activity beyond both users' opening posts. Looking through the release notes of all the versions of the JSON Utilities SL library, I also did not see any remarks on resolutions of bugs in this vain. Thanks in advance for the assistance!
Last updated: 2026-06-10

Post by kevintumibay on Struggling to connect to EK1100 to Raspberry Pi ^{CODESYS Forge talk (Post)}
SUMMARIZED VERSION OF QUESTION: I'm trying to connect a Raspberry Pi running "Codesys Control for Raspberry Pi" to a Beckhoff EK1100, unfortunately, when I try to connect I get the following messages SEE FIRST PICTURE DETAILED VERSION OF QUESTION: Hi everyone, I'm a college student that is super interested in learning about PLCs. I wanted to dive into the subject and decided to follow this great Instructables article: https://www.instructables.com/Programming-Raspberry-Pi-With-CODESYS/ Thank you in advance for your help! My current setup is as follows: 1. I have Codesys Control for Raspberry Pi, version 4.14.0.0, (https://store.codesys.com/en/codesys-control-for-raspberry-pi-sl.html) installed on a Raspberry Pi 3B. 2. I am using my smartphone hotspot to create a network. 3. I have CODESYS 3.5 SP21 (64 bit) installed on my Windows 11 laptop. 4. Both the Raspberry Pi and my laptop are connected to the smartphone hotspot network (I am wirelessly connecting to the Raspberry Pi). Connecting to the Raspberry Pi from CODESYS on my laptop: 1. I launch Codesys Installer -> I install Codesys Control for Raspberry Pi (link to the software). 2. I launch Codesys 3.5 SP21 (64 bit) on my laptop. 3. I go to file --> new project --> standard project --> in the pop-up I select "Codesys Control for Raspberry Pi" and "Structured Text" 4. I click on tools -> Deploy Control SL (on older versions of Codesys you would click on "update Raspberry Pi", I got that information from this video: link) 5. Inside Deploy Control SL --> I go to the "communication" menu and I input the IP address of my Pi, the password, and click on connect. 6. Inside Deploy Control SL --> I go to the "deployment" menu and I install Codesys Control for Raspberry Pi SL and Codesys Edge Gateway for Linux 7. Now I double click on "device" in the left hand tree and put in the IP address of my Raspberry Pi and click on connect --> success! I am able to connect! SEE SECOND PICTURE Powering the EK1100 and connecting it to the Raspberry Pi: 1. I am supplying the EK1100 with 24 V across the + and - pins. 2. I have jumper wires going from the + pin to the 24V pin and from the - pin to the 0V pin. SEE THIRD PICTURE 4. I am pretty confident that the EK1100 is receiving power because the "LED Us 24 V" and "LED Up 24 V" are lighting up. 5. I then run an ethernet cable from the EK1100 to the Raspberry Pi port (the Raspberry Pi is connected to my laptop wirelessly over WiFi). I think this connection should also be good since the LINK/ACT LED lights up. Trying to connect to the EK1100: 1. Back in Codesys I right-click on "Device" in the left tree and then in the pop up I click on "add device". 2. I then click on EtherCAT Master. 3. Next in a terminal window I SSH into the raspberry Pi and run the "ifconfig" command. 4. From there I get the MAC address for eth0 --> in my case: b8:27:eb:29:a9:25 5. Then, back in Codesys I double click on "EtherCAT Master" in the left hand tree. I then paste the MAC address into the "Source Address (MAC)" field. 6. I go to the Beckhoff official website and download the XML files for EtherCAT: https://www.beckhoff.com/en-en/products/i-o/ethercat-terminals/ek1xxx-bk1xx0-ethercat-coupler/ek1100.html? 7. I unzip those files in my computer into some folder that I can remember. 8. Back in Codesys I click on "Tools" --> "Device Repository" --> "Install" --> and then on the "Beckhoff EK11xx.XML" file. 9. In theory the necessary XML file is now installed. 10. THIS IS WHERE I RUN INTO THE PROBLEM: I then click on login --> I right click on EtherCAT_Master and then scan for devices --> and nothing. 11. It just doesn't detect it. On top of this whenever I login I get those orange triangles on the left on my tree. When I check the Log I get the messages at the very first screenshot of this post. SEE FOURTH PICTURE Solutions that I have tried to resolve this problem: 1. I thought it was maybe the .XML file so I installed all the .XML files from the EtherCAT folder that I downloaded. That didn't fix it. 2. I went on the Wayback Machine and got the .XML files from 2018 as I thought maybe an older version would work. This file of EtherCAT folders had a .XML file named "Beckhoff EKxxxx.XML" I thought this would work because that's the name of the file the guy in the Instructables used (https://www.instructables.com/Programming-Raspberry-Pi-With-CODESYS/). That didn't do anything. 3. I ran the PLC on my computer instead of the Raspberry Pi and tried to connect to the EK1100, in case the issue was with the Raspberry Pi, but I still ran into the same error from the picture above: "Attention! The device was not found in the repository. Vendorcode: 0x0. Productcode: 0x0. Revision: 0x0". SEE FIFTH PICTURE 4. I reinstalled Codesys, I was originally on version 3.5 SP20 when I did this, I upgraded to 3.5 SP21 with no success. 5. I then thought the solution might be to first add the EK1100 hardware before connecting so I did the following: 6. Right click on "EtherCAT Master" on the left hand tree --> then click on "add device" --> then I added the "EK1100 EtherCAT Coupler (2A E-Bus)" MY THEORY OF WHAT IS CAUSING THE PROBLEM: I asked ChatGPT for help and it said that it might have something to do with the revision number. On the physical EK1100 it says "Rev. Nr.: 0018". I believe that this means that I need to a revision 0018 XML file but if you look in Codesys it says the version is 16 (picture above). This is confusing because I got my .XML file from the official Codesys website so it should be the most up to date version possible. I searched and I searched and I couldn't find a version 18 .XML file, I don't even now if this exists. Any help you can provide is greatly appreciated, I don't know what to do anymore and I really really want to get this working. Thank you!
Last updated: 2025-03-30

Post by jegerjon on Find index based on values ^{CODESYS Forge talk (Post)}
Hi, I need to figure out witch indexes of an Array containing the highest and lowest values. Typically search for the 5 lowest values and result the indexnumbers containing the 5 lovest values. is there a library for this, or codeexample?
Last updated: 2023-08-20

Post by jegerjon on Find index based on values ^{CODESYS Forge talk (Post)}
Hi, I need to figure out witch indexes of an Array containing the highest and lowest values. Typically search for the 5 lowest values and result the indexnumbers containing the 5 lovest values. is there a library for this, or codeexample?
Last updated: 2023-08-20

Post by sven01 on Documentation / Usage Help For Scripting Engine Libraries ^{CODESYS Forge talk (Post)}
Hi, I am still not able to figure out how to use the the classes and their functions. 😔 Let's say I would like to use the function "importfile()" from the class "ScriptTextListObject.ScriptTextListMarker". I would be grateful for an additional example. Thanks! 😊
Last updated: 2023-08-21

Post by kunz on Profinet Device keeps abort connection with AR alarm.ind(err) ^{CODESYS Forge talk (Post)}
Can somebody explain what the error Connection aborted: AR alarm.ind(err) exactly mean? I have the same Problem and dont know how to solve the issue
Last updated: 2023-08-21

Post by janderson on OPC UA Server limitations, large array crashes runtime ^{CODESYS Forge talk (Post)}
when using an array of structs, the runtime crashes. but when using an array of LREALS, it'll do 100k at least
Last updated: 2023-08-23

Post by eschwellinger on Connection to device closed ^{CODESYS Forge talk (Post)}
is there a way to check the plclog on Opus A3 by using cmd line under Linux? This log is what you need to check for the disconnection problem
Last updated: 2023-08-24

Post by reinier-geers on Ping By Name ^{CODESYS Forge talk (Post)}
How can i ping my computer by name ? My controler uses SysSockPing , But seems only by IP adres, not by name. IP adres changes. So how can i ping by name or know that im connected
Last updated: 2023-08-24

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