Post by matthew on High resolution displays with 150% scaling causes CodeSys IDE to be blurry ^{CODESYS Forge talk (Post)}
I have just upgraded my laptop which has a high res display 2560x1600 and I have to have scaling switch on at 150% but everything looks blurry and not crisp, It seems CodeSys IDE is the only software on my system to look this bad, if I switch to 100% it's crisp but way to small. From a bit of research this could be due to the use of old windows forms or something? I have found a temp workaround that sort of works but not great. You have to run CodeSys in compatibility mode and adjust the DPI settings, this works ok and the editor is clear and crisp again but the actual tool bars are small like running at 100% Anyone got any tips for running CodeSys on high res displays with scaling?
Last updated: 2025-03-03

Post by struccc on Problem Reading Registers via Modbus from non Codesys device ^{CODESYS Forge talk (Post)}
Hi, Might be a good idea first to try out the connection and the device with some handy software, like Modbus Poll. There you can see better, what's really going on... - Is it really connected? - What error code does it return? - Can it read from the register address? - Maybe try Input registers and Holding Registers - can make a difference - Sometimes register addresses are messed up: shifted +-1 (mixing of 2 standards) - Sometimes register addresses start with offset 30000, 40000 ... - Are you using the right protocol? - Is it RTU or TCP? Maybe ASCII? - Can even have a look at the data packets, etc... All this is easier to figure out first with some modbus utility... and then to set it up in CODESYS should not be an issue. P.
Last updated: 2025-03-09

Post by hemuv on Dialog Open ^{CODESYS Forge talk (Post)}
I'm programming an HMI for a machine. I want to log all the parameter's changes (used text field for displaying and changing) for particular User levels. Created a Numpad and want to log oldvalue and Newvalue on 'ok' Button press. To retrieve the oldvalue, i check if the dialogue opened is my Numpad, Then I retrieve the dialogue interface via GetDialogInterface(ADR(myNumpad)) --> numpadData.stVariableValue which contain my oldvalue and save it locally. Problem is sometimes i retrieve the data and sometimes not. Also observed when Numpad Dialogue is Opened, VisuDlgUtil_IsDialogOpen returns False in some cycles.Attached you will find my Project. please let me know what went wrong or if there is a better approach to collect old and New Value of a textfield. Thank you.
Last updated: 2025-03-26

Post by sean-barton on Function block method default arguments ^{CODESYS Forge talk (Post)}
I have default arguments specified for function block methods but when calling a method, an error is produced requiring me to supply all the arguments despite there being default values. According to the online documentation, under section "Calling a Method" and subsection "argument passing" of the following link: https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_obj_method.html "Passing an argument for an input ... can be omitted ... for which a default or initial value was specified in the declaration..." I have found this to be the case for all Codesys IDEs I've used, 3.5.11, 3.5.16, 3.5.17, 3.5.19. Am I missing something?
Last updated: 2023-12-21

Post by rh-pk on v3.5 SP19 - Modbus TCP Devices - Channel Limit? ^{CODESYS Forge talk (Post)}
Hi, i found a solution for me. I had installed a 'old' version of CoDeSys (3.5.18 P5). I tried to add channels there, which works fine. I created a new project, added an Ethernet-Port, added a Modbus-Master and then I copied the ModBus-Slave from my working project to the new project. Now I could add more channels. I add the channels 10 and 11. Then I deleted (please make a backup before :-) the original ModBus-Slave in my working project and copied the extended Slave back to my working project. Surprisingly it is now possible to add new channels. Maybe this will help you.
Last updated: 2024-02-14

Post by wmoon on Licensing info not available. ^{CODESYS Forge talk (Post)}
Hello, I bought some licenses from CODESYS store. I am trying to install licenses into my device(CODESYS Control for Linux ARM64 SL). But I have a trouble with it. I did it in the following order. Tool -> License Manager Selected Device and Next... Selected Soft container and Next... Select the device and Ok.. And then I always show a message "Licensing info not available. There is no dongle attached to the device." And I tried to click "Install Licenses" button. I saw the message "The value cannot be NULL. Parameter name : continerToLicenses" Could you let me know what I've missed or what I've got wrong?
Last updated: 2024-03-19

Post by m83coding on Raspberry Pi Codesys SPI Master ^{CODESYS Forge talk (Post)}
Hello, I am trying to control shift registers 74HC596 and 74HC165 via Raspberry PI with SPI interface. So far I did it with a Microcontroller and now I wanna upgrade my Projekt with Raspberry Pi and Codesys Software to be more flexible. I tried to adapt PiFace Function Block to just send or recive a 8 bit via SPI interface of the my Raspberry Pi. With following code (see attached screenshots) * PLC_PRG * PiFaceDigital * PiFaceDigital.write8 * PiFaceDigital.read8 I have a signal at SCK and MOSI pin of the PI, so far so good. But I really struggle with the unterstanding of the code. Is there some detailed description of each line of code? Or is there somebody in the community who can explain each line of code? Or is there a more simple way to send / recive 8 bit via SPI? Manuel
Last updated: 2024-04-23

Post by jaspergain on Non-existing identifiers ^{CODESYS Forge talk (Post)}
Hello, I got a bit of a weird issue going on which is kind of annoying. So recently we switched a lot of Modbus IO to EtherCAT, as we were having issues with stability. All works fine, which is great. But sometimes when I change the program I get errors claiming that identifiers are not defined. Meaning I can't go online. See the picture below. I believe this is because some of these identifiers were used with Modbus, and they weren't properly removed/deleted? A clean all temporary fixes the issue, but it comes back again after a while of changing the code, and building. Any way to fix these non-existing required identifiers, or even find out where they are required? Thanks for the help in advance. Jasper.
Last updated: 2024-05-29

Post by kuegerls on SysProcessExecuteCommand2 and CANopen Device ^{CODESYS Forge talk (Post)}
Hello, CODESYS Control is running on my RevPi, and my system communicates over a CANbus with a master using the ConnectCan module (Slave - CANopen Device). The communication works perfectly fine so far. However, as soon as I call a Python script with "SysProcessExecuteCommand2" that creates a CSV file and executes without errors, the master does not adopt any changes to the Transmission Process Data Objects (TPDOs). I don't quite understand what one has to do with the other, and perhaps someone can help me with this. Here is my script call: SysProcess.SysProcessExecuteCommand2(pszCommand:='python /home/pi/test.py', pszStdOut:=sCMDOutput, udiStdOutLen:= SIZEOF(sCMDOutput), pResult := ADR(eResult)); Thank you in advance! Best regards, Stefan
Last updated: 2024-06-20

Post by rohan on Child Application Alarm ^{CODESYS Forge talk (Post)}
Hi All, I'm trying to develop a multi-application project that allows me to switch between applications. I currently have a parent application and several child applications, as this is the only way for them to share CAN/Ethernet communication. I've noticed that I am only able to create an Alarm Configuration for the parent application. But the children application do not seem to be displaying alarms on the Alarm Table in the visualisation for when an alarm is raised. Does anyone know of a fix, solution or a way around this? I am utilising Codesys v3.5 SP16 Patch 5 64Bit
Last updated: 2024-06-21

Post by timvh on CPU + EtherCAT redundancy ^{CODESYS Forge talk (Post)}
It works well with two Wago 750-8210's. I helped a few customers setting this up. But it should work with any device which can control EtherCAT I/O, is real-time and has sufficient network interfaces. Two network adapters can be used to create a redundant EtherCAT network (you need 2 additional switches for this). The other network adapters can be used to interconnect the 2 PLC's (synchronization). We noticed that if you exchange variable lists that there could be some issues if you have long lists. So what we did is use a SoftPLC on a server that contains all the settings which continuously sends network packages (GVL sender) and which is received by both PLC's (network receiver). Switching over is done in milliseconds. The bus doesn't notice the change-over. EtherCAT communication works flawlessly.
Last updated: 2026-01-30

Post by alex2 on Error Highlighting Not Working in CODESYS v3.5 SP10 on Windows 11 ^{CODESYS Forge talk (Post)}
Hello everyone, I'm currently using CODESYS v3.5 SP10 on Windows 11, and I've noticed that syntax errors are not automatically underlined in red as they normally should be. Is there a specific setting that needs to be enabled for this feature to work? If so, could you please let me know where to find it? I’ve already tried uninstalling and reinstalling CODESYS, but that didn’t resolve the issue. Also, i have a teammate who have exactly the same computer as me and he didnt encounter any issue. Thank you in advance for your help!
Last updated: 2025-05-13

Post by mawaloc on KeyPad Function in Visualization to fill a table ^{CODESYS Forge talk (Post)}
Hello Everybody, Hope you're all doing good for this new year. Since a time, I'm looking on how to use the KeyPad in vizualization to fill a textlist or something similar. my application is : In one window, I would need to be able to writte a string linked to an Numeric Values. => I can't use a std text list inside my software, as per this would be custom by customer. then from another windows I would need a "text box" to be able to select any of this String. I hope it's clear enought. thankyou for the help
Last updated: 2026-01-07

Post by wbj0t on mobus tcp slave device. read/write holdings with 2 variables. ^{CODESYS Forge talk (Post)}
Hi there. I have an issue to read and set time for the controller. In the issue many registers described as writable by 6/16 functions, and, in this time, also(!) readable! For example: I have time registers: min, hour, day, mon, year. By specifications it is possible check time (so I need always update these varibles in loop) and set time by writing these same registers, BUT how to set, if they will immediatle updated by current time after writing? So, I need to separate one address at two variables. I have seen option mark: Overlay of the process image by the holding and input register. I understand this so: When I READ by function 3, I will get variable that connected with the same INPUT address and when I WRITE by 6/16 this will change second variable that connected with HOLDING address. BUT, this mark doesnt work, when I write 6/16 and try to get by function 3, I will get written value instead INPUT variable. So, what to do?
Last updated: 2024-03-20

Post by anonymous on Hi, I try to send and receive data using a UDP connection via SysSocket 3.5.17.0. While sending data works fine, I have problems with the receiving part. I am able to capture the received data of client side in wireshark But unable to capture it on the codesys ^{CODESYS Forge talk (Post)}
Hi, I try to send and receive data using a UDP connection via SysSocket 3.5.17.0. While sending data works fine, I have problems with the receiving part.I am able to capture the data of client side in wireshark but i am unable to capture it in the codesys. Heres the below part of code of client side. PROGRAM POU_udpclient_program VAR istep : INT := 1;//step variable for state machine xStart: BOOL;// Flag to start the UDP protocol iecSocketId: syssocket_interfaces.RTS_IEC_HANDLE;//socket handle for receiving iecCreateResult: syssocket_interfaces.RTS_IEC_RESULT; ipAddr: syssocket.SOCKADDRESS;//Socket address structure for receiving sIpAddress : STRING := '192.168.0.2'; wPort: WORD:= 12346; iecConnectResult : syssocket_interfaces.RTS_IEC_RESULT;//connect paramters sDataRec : STRING[255];//Buffer for received data xiRecBytes : __XINT;//number of bytes received iecRecResult : syssocket_interfaces.RTS_IEC_RESULT;//receive data parameters iecCloseResult : syssocket_interfaces.RTS_IEC_RESULT; END_VAR syssocket.SysSockInetAddr(sIpAddress,ADR(ipAddr.sin_addr)); ipAddr.sin_family := syssocket.SOCKET_AF_INET; ipAddr.sin_port := syssocket.SysSockHtons(wPort); CASE istep OF 1: //create socket IF xStart THEN iecSocketId:= syssocket.SysSockCreate(syssocket.SOCKET_AF_INET,syssocket.SOCKET_DGRAM,syssocket.SOCKET_IPPROTO_IP,ADR(iecCreateResult)); IF iecSocketId = syssocket_interfaces.RTS_INVALID_HANDLE THEN xStart := FALSE; istep := 1; ELSE istep := 2; END_IF END_IF 2: //connect to socket server using setoption iecConnectResult := syssocket.SysSockSetOption(iecSocketId,syssocket.SOCKET_SOL,syssocket.SOCKET_SO_REUSEADDR,ADR(ipAddr),SIZEOF(ipAddr)); istep := 3; 3: //receive data xiRecBytes := syssocket.SysSockRecvFrom(iecSocketId,ADR(sDataRec),SIZEOF(sDataRec),0,ADR(ipAddr),SIZEOF(ipAddr),ADR(iecRecResult)); istep := 4; 4: //close socket iecCloseResult:= syssocket.SysSockClose(iecSocketId); xStart := FALSE; istep := 1; END_CASE
Last updated: 2024-06-03

Post by shabroz-gill on Exception when OPCUA datasource disconnects from Server ^{CODESYS Forge talk (Post)}
If i loose the network and the opcua data source suddenly looses connection with the server, i get an exception and my application stops working. I am using the latest version of the communication add v4.5.2.0 Is this a known issue? This makes the datasource unusable because it is inevitable that we will loose connectivity at some point, and the datasource crashing everything due to that seems to be a deal breaker. I can provide more details is someone from codesys is reading this. You can recreate is by just shutting off the Opc server after the codesys data source is connected and reading data from it. The codesys app does not crash everytime and sometimes it is able to reconnect without crashing, so you may have to try this a few times to see the exception. Best regards
Last updated: 2024-09-16

Post by ivanj on Codesys V3 + Rpi + PCA9685 + two robot arms ^{CODESYS Forge talk (Post)}
greetings to everyone I have a system consisting of rpi3 computer with codesys v3 installed connected to one pca9685 through which the servo motors of the two robotic arms are connected (each robot arm has 6 motors) I managed to get that the pca9685 can only drive 4 servos on the first arm the other 2 on the same robot arm do not respond, nor do the remaining 6 they do not react on the other robotic arm. Power is connected to the pca9685 for motors of sufficient power or amperage. I tried to put another pca9685 but the same thing happens again. What is the possible problem?
Last updated: 2024-10-02

Post by trusty-squire on Read "Homed" status from EtherCAT drive ^{CODESYS Forge talk (Post)}
Hi, Is there a way to read the homed status from the EtherCAT drive directly? I am currently flagging the homed status on the succesful completion of the MC_Home function block, but I have had false triggers where the drive didn't actually execute the homing procedure but the MC_Home FB is marked as complete without error. I looked at other MC/SMC function blocks but the closest I can find is the "Homing" bit from MC_ReadStatus FB, but this doesn't show if the drive is succesfully homed, only that it's homing. Any guidance is welcome. Thanks!
Last updated: 2025-01-07

Post by sawicpx on CANbus Remapping PDOs During Runtime ^{CODESYS Forge talk (Post)}
Hello, I am working on an application where I need to remap PDOs to a different CANopen object during runtime depending on what value is at a specific register. I have gotten to the point where I put the device into Preoperational State using the CIA405.NMT function. I then reconfigure the PDO 180x and 1a0x obejcts usings SDOs to point to a new canopen object on the device however when I go to restart the Device from PREOP to OP using the CIA405.NMT function the device is reset back to the original configuration as per the initial setup. I am wondering is there any way to change the PDOs at runtime is there some more functionaility I can access to do this. Any direction is appreciated!
Last updated: 2023-12-22

Post by mp9876 on Device User Logon ^{CODESYS Forge talk (Post)}
Following up on the invalid user authentication on the target Not 100% sure what the problem was but following my post I managed to create an administrator level user. Then my next issue was that I could not connect to the device. I might have flipped the device from a 64 bit version to a 32 bit version so I did UPDATE DEVICE back to the 64 bit version; still could not connect somehow. Then I did two things at the same time that fixed my problem: Wiped the Codesys Control Win 64 bit version and installed the 32 bit version Installed latest Codesys Control Win V3.5 SP20 (released today) I wish I knew which one of these actions fixed the problem but at least the problem is solved. Hoping this post may help someone one day
Last updated: 2024-03-19

Post by fontrap on cmDongle Raspberry Pi issue ^{CODESYS Forge talk (Post)}
Good morning @eschwellinger, After some research I found out that the problem is the preinstalled CodeMeter on Raspberry Pi. As I mentioned the CodeMeter was installed on the Raspberry because I use a license from other vendor that needs the CodeMeter to be installed. The problem is that when I uninstall the CodeMeter from Raspberry I am able to detect the dongle from CODESYS and everything works as it should be but now the other product can not detect its own license. When I reinstall the CodeMeter I am back to the initial problem. Is there a way to overcome this conflict through CODESYS?
Last updated: 2024-04-24

Post by alimans on Unrecoverable SoftMotion state after switch to PreOp ^{CODESYS Forge talk (Post)}
For anyone still experiencing this issue, here’s how I managed to solve it: Symptoms: 1. Sometimes, on the first start of CODESYS Runtime, the modules fail to run. 2. After disconnecting and reconnecting the communication cable, the drive does not start again. 3. MC_Reset cannot clear the fault. Solution (what worked for me): 1. Check the axis communication using the SMC_CheckAxisCommunication function block (FB). 2. If CheckAxisCommunication.eComState of the axis is equal to or higher than SMC_CommunicationState.SMC_COMSTATE_BASE_COM_INITIALIZATION, then 3. Use the SMC3_ReinitDrive function block to reset the drive — and it works. For more information, refer to the official CODESYS documentation: 👉 https://content.helpme-codesys.com/en/libs/SM3_Basic/Current/SM3_Basic/DriveInterface/AXIS_REF/SMC3_ReinitDrive.html
Last updated: 2025-10-23

Post by jzhvymetal77 on IecVarAccessLibrary.IBaseTreeNode methon ^{CODESYS Forge talk (Post)}
I had this code working in a previous version of CoDeSys to read variables from a GVL that were added to the Symbol configuration. The problem now is that when I get the _IBaseTreeNode_Parent, it returns a valid interface, but none of the methods or properties work. If you monitor the _IBaseTreeNode in the watch window, it does show the correct child count. However, it fails at step 30, where the child count incorrectly returns zero. In the image, you can see that the watch window displays the correct value that the property should return. Attached is the full project code. FUNCTION_BLOCK Symbols_TO_STR VAR_INPUT i_sPath : STRING(255); i_diIndexChild : DINT; i_diIndexComponent : DINT; END_VAR VAR_OUTPUT q_diChildCount : DINT; q_diComponentCount : DINT; q_sName : STRING(255); q_sValue : STRING(255); q_sType : STRING(80); q_sErrorResult : STRING(80); END_VAR VAR uiStepCopy : UINT; uiStep : UINT; uiStepProcessCopy : UINT; uiStepProcess : UINT; _IBase : IecVarAccessLibrary.IBase; _pIIecVarAccess5 : POINTER TO IecVarAccessLibrary.IIecVarAccess5; _IIecVarAccess5 : IecVarAccessLibrary.IIecVarAccess5; _RTS_IEC_RESULT : IecVarAccessLibrary.RTS_IEC_RESULT; _udiResult : UDINT; _VariableInformationStruct : IecVarAccessLibrary.VariableInformationStruct; _IBaseTreeNode_Parent : IecVarAccessLibrary.IBaseTreeNode; _IBaseTreeNode_Child : IecVarAccessLibrary.IBaseTreeNode; _ITypeDesc_Child : IecVarAccessLibrary.ITypeDesc; _TypeDescAsUnion_Child : IecVarAccessLibrary.TypeDescAsUnion; _arIBaseTreeNode_Child : ARRAY[0..20] OF IecVarAccessLibrary.IBaseTreeNode; _TypeClass_Child : IecVarAccessLibrary.IBaseLibrary.TypeClass; _psSymbolName_Child : POINTER TO STRING; _sSymbolName_Child : STRING(255); _IBaseTreeNode_Component : REFERENCE TO IecVarAccessLibrary.IBaseTreeNode; _TypeClass_Component : IecVarAccessLibrary.IBaseLibrary.TypeClass; _ByteAddress_Component : __XWORD; _ByteOffset_Component : __XWORD; _sArrayIndexName_Component : STRING(20); _diArrayIndexCalc_Component : DINT; _diArrayIndexValue_Component: DINT; _psSymbolName_Component : POINTER TO STRING; _sSymbolName_Component : STRING(255); END_VAR uiStepCopy:=uiStep; uiStepProcessCopy:=uiStepProcess; CASE uiStep OF 10: // GET IBASE FROM CURRENT APP _IBase:= IecVarAccessLibrary.IecVarAccGetFirstInterface2(0); IF _IBase<>0 THEN uiStep:=20; ELSE q_sErrorResult:=CONCAT(UINT_TO_STRING(uiStep), ': IecVarAccGetFirstInterface2'); uiStep:=9000; END_IF 20: //QueryInterface IIecVarAccess5 from IBASE _pIIecVarAccess5 := _IBase.QueryInterface(IecVarAccessLibrary.ITFID_IIecVarAccess5, ADR(_RTS_IEC_RESULT)); IF _pIIecVarAccess5<>0 AND _RTS_IEC_RESULT=0 THEN _IIecVarAccess5 := _pIIecVarAccess5^; uiStep:=30; ELSE q_sErrorResult:=CONCAT(UINT_TO_STRING(uiStep), ': QueryInterface_IIecVarAccess5'); uiStep:=9000; END_IF 30: // Get IBaseTreeNode_Parent _IBaseTreeNode_Parent := _IIecVarAccess5.VarAccGetNode3(ADR(i_sPath), ADR(_VariableInformationStruct), ADR(_RTS_IEC_RESULT)); IF _IBaseTreeNode_Parent<>0 AND _RTS_IEC_RESULT=0 THEN q_diChildCount:=_IBaseTreeNode_Parent.ChildCount; uiStep:=40; ELSE q_sErrorResult:=CONCAT(UINT_TO_STRING(uiStep), ': IBaseTreeNode_Parent'); uiStep:=9000; END_IF 40: // Get IBaseTreeNod_Child IF(q_diChildCount-1>=i_diIndexChild AND i_diIndexChild >=0) THEN _IBaseTreeNode_Child := _IBaseTreeNode_Parent.GetChild(i_diIndexChild); IF _IBaseTreeNode_Child<>0 THEN uiStep:=50; ELSE q_sErrorResult:=CONCAT(UINT_TO_STRING(uiStep), ': IBaseTreeNode_Parent'); uiStep:=9000; END_IF ELSE q_sErrorResult:=CONCAT(UINT_TO_STRING(uiStep), ': i_diIndexChild OutBounds'); uiStep:=9000; END_IF
Last updated: 2025-08-20

Post by yannickasselin on codesys VLAN tagging ^{CODESYS Forge talk (Post)}
Hi, I am looking for exactly the same thing. I would think that using a layer 2/3 managed switch should work but I am not convinced. I would like to test it in order to see if it would be possible to run many Codesys Docker instances on a server and run only 1 ethernet cable from the server to a managed switch closer to the machines beeing controlled instead of having to run multiple long ethernet cables. I was going to buy a managed switch in order to test it but I want to first make sure it is possible and I want to figure out exactly what kind of switch I would need. Is this even possible? I think this is a feature that would be very useful paired with "Codesys Virtual Control SL". Thank you
Last updated: 2024-09-07

Post by wbj0t on Raspberry Pi CM4. CoDeSyS files corrupted after hard reset. ^{CODESYS Forge talk (Post)}
Hello everyone. Raspberry Pi CM4 after some 1 week of work was hard reset mannualy several times and after these hard resets User Management file was missed (when click login button, enter login/password, error: User Management File missed). Also programm can not open file via SysFile library, but this file exists and size of him is 0 bytes, but must be more any way (I keep some kind of archive via this lib). What happens, how files corrupted? Where do I need try to find this error of the codesys or system whole? In the log files of codesys nothing interesting about this happens. Thanks for reading Is this enough hold PlcLogic and SysFileMap.cfg as reserve copy in another place for restoring the programm? And how automate restoring actions if programm files corrupted?
Last updated: 2024-09-16

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