Post by gordonkeller360 on Escape character behavior for hex values in string -- what gives? ^{CODESYS Forge talk (Post)}
I have a program which sequentially places byte representations of characters from a string into an array. FUNCTION_BLOCK MoveBytesFromString VAR_IN_OUT abRxBuf: ARRAY [0..79] OF BYTE; END_VAR VAR testString : STRING := '$0A$R$L$TTesting,123...$94$86$0A'; iCount: DINT; END_VAR ---------------------------------------------------------------------------------------- // clear the buffer MEM.MemFill(ADR(abRxBuf), 80, 0); FOR iCount := 0 TO LEN(testString) - 1 DO // account for undesired null terminator of string abRxBuf[iCount] := testString[iCount]; END_FOR Escaped characters, like $T, $N, etc. work just fine, and so do their hex representation counterparts ($09, $0A, etc). However, when I put something like $94, I get a set of nonsense values... see image attached after one spin of the program. Could someone explain to me what is happening here? I'll continue to investigate...
Last updated: 2026-03-09

Post by otbeka on CAA File Handling: "Read only" error ^{CODESYS Forge talk (Post)}
Hi, On CODESYS V3.5.19.50 I am using the latest 3S File Access library (CAA File & CAA Types) to save and retrieve configuration data from the User Data section of an SD card, via file called config.txt. The application reads the file to memory once upon initialisation, and then the only other operation is overwriting the file with the updated configuration whenever the user changes the settings. An issue is ocurring, seemingly randomly, where the config.txt file, and all surrounding directories, cannot be written to by the unit, returning a READ_ONLY_CAA error upon file open. This sometimes does not clear even after power-cycling the PLC several times, yet checking the file permissions with ls -l shows normal read, write, and execute access. I am wondering if this is caused by the PLC itself or by an issue in my application. I have included my CAA File handler function block (SD_Card_Bin(FB).txt) and any associated types/calls below: TYPE ConfigData : STRUCT Config : ARRAY[0..256] OF STRING(64); NumberOfStrings : UDINT; END_STRUCT END_TYPE TYPE Buffer : STRUCT Data : ARRAY[0..SIZEOF(ConfigData)] OF BYTE; DataLength : UDINT; END_STRUCT END_TYPE A case within my MAIN PRG: mode.WriteConfigDataToFile: VisuElems.CURRENTVISU := 'Screen_Write'; IF xModeHasChanged THEN iErrorCount := 0; iRoute := 0; END_IF CASE iRoute OF 0: inBuffer := ConfigData_To_Buffer(GVL.UnitData); xConfigError := FALSE; xDataConfigured := FALSE; iRoute := 1; 1 : //Read Data from Card SD_Card_Bin.strFileName :=FileName; SD_Card_Bin.iFileOperation := 2; SD_Card_Bin(xExecute :=TRUE, WriteBuffer := inBuffer, xDone =>xDataConfigured, xError=>xConfigError, strErrorCodes=>strError); IF xDataConfigured THEN SD_Card_Bin(xExecute :=FALSE); IF xConfigError THEN iRoute := 32767; ELSE iRoute :=100; END_IF END_IF 100: // The end bCurMode := mode.DisplayProcessVariables; 32767: // Config error iErrorCount := iErrorCount + 1; IF iErrorCount > 2 THEN // Repeats 3 times, if no progress abandons and returns error bCurMode := mode.WriteError; ELSE iRoute := 0; // Try again END_IF END_CASE I'd like to rule out my application as the cause of this bug - help via comments or criticism would be greatly appreciated.
Last updated: 2025-03-19

Post by mondinmr on Jitter problems on imx8 ^{CODESYS Forge talk (Post)}
SOLVED!!! In this imx8 max_cstate=1 in kernel boot parameters is not working! We found a workaround: #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <stdint.h> int main(void) { int fd; uint32_t value = 0; fd = open("/dev/cpu_dma_latency", O_WRONLY); if (fd < 0) { perror("Error opening /dev/cpu_dma_latency"); return 1; } if (write(fd, &value, sizeof(value)) != sizeof(value)) { perror("Error writing to /dev/cpu_dma_latency"); close(fd); return 1; } while (1) { pause(); } } This simple code launched before CODESYS do the same work! Now jitter is identical as measured by cyclictest!
Last updated: 2023-10-19

Post by kleeswi on Visualization scaling problem with B&R T30 panel ^{CODESYS Forge talk (Post)}
I have found a work around. I have written a python scripts that runs on user login (entry in .bashrc) which overwrites the webvisu.htm and webvisu.cfg.json file with the configuration for the B&R T30 panel (resolution and disable scaling). First I tried to add this setting to the the CODESYSControl.cfg, but that does not work following the big CODESYS Control V3 Manual. [CmpTargetVisu] Application.WindowPositionX=0 Application.WindowPositionY=0 Application.WindowSizeWidth=800 Application.WindowSizeHeight=480
Last updated: 2024-07-30

Post by micik on ERR_OK not recognized ^{CODESYS Forge talk (Post)}
Hello, if I try to use ERR_Ok in my code to check whether the file is open correctly or not, I get an error "Identifier ERR_OK not recognized", I can use plain 0 (zero) instead. But in general, is this a proper way to check for success of file operation since the 4th parameter is a poinmter to RTS_IEC_RESULT, and normally I would expect this to be used somehow. _hFile := SysFileOpen(_sFileName, am:=SysFile.ACCESS_MODE.AM_WRITE, ADR(_result)); IF _result <> 0 THEN udDiag := 100; RETURN;
Last updated: 2024-08-17

Post by gatto on Read codesys version in the codesys application ^{CODESYS Forge talk (Post)}
hi, i used another way declaration: pApp : POINTER TO APPLICATION; pAppInfo : POINTER TO APPLICATION_INFO; ProjectName : STRING (24) ; CodesysVersion : STRING (15) ; code: //library : // CmpApp // IoDrvEthernet // // Get Pointer to current application pApp := CmpApp.AppGetCurrent( pResult:= 0 ); // Get Pointer to Application information pAppInfo := CmpApp.AppGetApplicationInfo(pApp:= pApp, pResult:= 0 ); ProjectName := pAppInfo^.pstProjectName^ ; //convert codesys version to string CodesysVersion := IoDrvEthernet.UDINT_TO_IPSTRING ( udiIPAddress := pApp^.udiPSVersion ) ; so i think you need to convert your dwVersion in a UDINT and after convert UDINT_TO_IPSTRING
Last updated: 2025-01-17

Post by phryniszak on RPI CANFD ^{CODESYS Forge talk (Post)}
Hi, I have rpi with CANFD MCP2518FD. Classic can communication is working OK but when I try open in CANFD hDriver := CL2.FdDriverOpenH(usiNetId := 0, uiNominalBaudrate := 500, uiDataBaudrate := 0, xSupport29Bits := FALSE, ctMessages := 100, peError := ADR(eError) error is returned with value 10226 which is not documented (https://content.helpme-codesys.com/en/libs/CAA%20Can%20Low%20Level%20Extern/Current/CAN-Low-Level/Enums/ERROR.html#error) CAA CanL2 is 3.5.21 version. Question is: 1. Is anyone get CANFD working? 2. What is meaning of this value (10226)? Regards, Pawel
Last updated: 2025-08-09

Post by phryniszak on RPI CANFD ^{CODESYS Forge talk (Post)}
Hi, I have rpi with CANFD MCP2518FD. Classic can communication is working OK but when I try open in CANFD hDriver := CL2.FdDriverOpenH(usiNetId := 0, uiNominalBaudrate := 500, uiDataBaudrate := 0, xSupport29Bits := FALSE, ctMessages := 100, peError := ADR(eError) error is returned with value 10226 which is not documented (https://content.helpme-codesys.com/en/libs/CAA%20Can%20Low%20Level%20Extern/Current/CAN-Low-Level/Enums/ERROR.html#error) CAA CanL2 is 3.5.21 version. Question is: 1. Is anyone get CANFD working? 2. What is meaning of this value (10226)? Regards, Pawel
Last updated: 2025-08-09

Post by kurtk on Screenshot with "Sys Process Execute Command" ^{CODESYS Forge talk (Post)}
I am working on this same thing... I wonder if when you execute it in a "terminal" it is a graphical terminal window running under X whereas when it is run from a SysProcess, it is "headless" and hence X-less Does DISPLAY=:0 magically attach to the X session Wouldn't it make sense that scrot or imagemagick would automatically by default reference DISPLAY=:0 I'm just trying to figure out how this works or is supposed to work
Last updated: 2025-09-12

Post by wiresplus on INT_TO_WORD function not working ^{CODESYS Forge talk (Post)}
Hello, I need to take an INT input, and convert it to a WORD value. VAR DRV2Speed : WORD; //IO card takes a WORD where 16000 = full 10V output (equivalent to 50Hz) PumpFillSpeed : INT; //Users enter a value between 0 and 50 END_VAR IF <conditions> THEN DRV2Speed :=INT_TO_WORD((PumpFillSpeed/50)*16000); END_IF </conditions> According to me this should work - but it stays at 0, no matter what. What am I doing wrong?
Last updated: 2024-01-26

Post by rossanoparis on RevPi CONNECT+, CODESYS, EtherCAT master "Filedbus lost synchronicity" ^{CODESYS Forge talk (Post)}
Hello @rmaas I assume, you've already verified and tuned everything regarding the EtherCAT network. In my case the problem was due to a wrong core assignement. I suggest to not use the core #0 for your EtherCAT task. The OS realtime patch, which is present on RevPi OS, uses the core #0 for its porpouses and it mustn't be used by any other task which requires realtime and deterministic features. regards Rossano
Last updated: 2024-04-11

Post by gseidel on CNC - system goes to X=0 Y=0 before CNC file execution starts, how to avoid that? ^{CODESYS Forge talk (Post)}
Hi peterned, the start position given in the CNC properties is only used if you use the compile mode OutQueue. With compile mode SMC_CNC_REF, you need to provide the start position in the IEC application. The function block SMC_NCInterpreter has an input piStartPosition. You can initialize it with the output of the forward kinematic transormation FB for your machine. In your case probably SMC_TRAFOF_Gantry2. Best regards, Georg
Last updated: 2024-04-30

Post by ryusoup on 'keep last value' option in CODESYS EtherCAT ^{CODESYS Forge talk (Post)}
Hello, I’m using CODESYS EtherCAT Master on a Raspberry Pi controller with several remote I/O modules. I’m facing an issue where the input values from the remote I/Os drop to 0 when a connection error occurs. Is there a way to configure a “keep last value” behavior (i.e., hold the last valid input) instead of defaulting to 0 on communication loss? Best regards,
Last updated: 2025-11-18

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 darko7417 on When running as a service, CodesysControl doesn't write log files to the disk (and other CmpLog related issuess) ^{CODESYS Forge talk (Post)}
I run CODESYS runtime as a service and use CmpLog (the LogAdd2 function) to log different events to a file. I have done this many times before on various projects and hardware, and it works fine. On this particular system, I have CODESYS 3.5.20.40 running on a Windows 11 PC. The CODESYSControlService autostarts (with Local System credentials, the default), and the application runs fine. However, the configuration file is not read (or at least not the one that should be, or not the CmpLog section), and log files are not written to the disk. I would be thankful if anyone knew why this is happening and how to fix it. A note to CODESYS people: you must provide more information on the codesys configuration file, CODESYSControlService.exe and other major components and system behaviour. You created the service and various features (i.e. logging), but haven't explained how they work, which, in my opinion, is below standard for industrial automation software. These are my observations: - When running as a service, the config file is not read (none of them), or at least the CmpLog section is not read. I checked the log using Codesys IDE, and the CmpLog parameters are not the ones I have set in any of the config files. Which CmpLog config values does the service use, and where does it read them from? I have no idea, but it's not the config files. Here are the codesys config files I located on the PC's disk: o C:\Program Files (x86)\CODESYS 3.5.20.40\GatewayPLC\CODESYSControl.cfg (only 2 lines in this config) o C:\Program Files (x86)\CODESYS 3.5.20.40\GatewayPLC\AppDataFiles\CODESYSControlWinV3\CODESYSControl.cfg o C:\Users\SRV\AppData\Roaming\CODESYS\CODESYSControlWinV3\C4DBB537\CODESYSControl.cfg o C:\Program Files (x86)\CODESYS 3.5.20.40\GatewayPLC\tempCFG\CODESYSControl.cfg - When I run codesys as an app (e.g. by clicking the icon), this config file is read C:\Users\SRV\AppData\Roaming\CODESYS\CODESYSControlWinV3\C4DBB537\CODESYSControl.cfg and log files are written ok. The icon target is "C:\Program Files (x86)\CODESYS 3.5.20.40\GatewayPLC\CODESYSControlService.exe" -d o the -d option, I think, starts a cmd-like window showing service debug output (the output shown in log in the IDE) o the -i option, again I think, means install the service - I tried adding -d to service start parameters in the registry, but it started only once and after that it refused to start. Knowing what -d does and which other options are available would be great (e.g. can I make the service read a different config file). - Syslog UDP logging works fine in any case. - These are my CmpLog parameters ~~~ [CmpLog] Logger.0.Name=PlcLog3 Logger.0.Filter=0xFFFFFFFF Logger.0.Enable=1 Logger.0.MaxEntries=10003 Logger.0.MaxFileSize=50003 Logger.0.MaxFiles=33 Logger.0.Backend.0.ClassId=0x0000010B ;sends logger messages to SysOut Logger.0.Backend.1.ClassId=0x00000104 ;writes logger messages in a file Logger.0.Backend.2.ClassId=0x00000135 ;sends logger messages as UDP syslog Logger.0.Type=0x314 ;Set the timestamp to RTC ~~~
Last updated: 2025-02-27

Post by sedoerr on Check For Open Dialogs On Client ^{CODESYS Forge talk (Post)}
FUNCTION CheckDialogOpen : BOOL VAR_INPUT sDialogName : STRING; END_VAR VAR pstClientData : POINTER TO VisuElems.VisuStructClientData; itfDialogManager : VisuElems.IDialogManager; itfMyDialog : VisuElems.IVisualisationDialog; END_VAR VisuElems.g_ClientManager.BeginIteration(); WHILE (pstClientData := VisuElems.VisuElemBase.g_ClientManager.GetNextClient()) <> 0 DO itfDialogManager := VisuElems.g_VisuManager.GetDialogManager(); itfMyDialog := itfDialogManager.GetDialog(sDialogName); CheckDialogOpen := VisuDialogs.VisuDlgUtil_IsDialogOpen(itfMyDialog,pstClientData,itfDialogManager); IF CheckDialogOpen THEN EXIT; END_IF END_WHILE
Last updated: 2023-09-26

Post by derpaul on Official MQTT-Client: MAX_RECEIVE_BUFFER_SIZE_EXCEEDED ^{CODESYS Forge talk (Post)}
That doesn't help at all: ---- plcload PLC load average: 20% CoreID: 0 --------------------------- PLC Core load: 20% And in taskconfiguration it says that the cycle time is about 5000us with MQTT enabled FBs and about 2800us whitout
Last updated: 2023-09-27

Post by riccardo on VisuElems.CurrentUserGroupId is not stable ^{CODESYS Forge talk (Post)}
GoodMorning everyone. I have a system that, in case of alarm, have to block. When the operator logs in must have to acknoledge the alarm and should operate in the system freely. To perform this I detect the logged User by (VisuElems.CurrentUserGroupID <> 0) with a similar code to the the following: PROGRAM AlarmMngt VAR alarm : BOOL:= FALSE; Ack : BOOL:= TRUE; PushBottonOpening : BOOL:= FALSE; Valve : BOOL := FALSE; Flag: BOOL := FALSE; END_VAR IF alarm AND Ack AND (NOT Flag) THEN valve := FALSE; PushBottonOpening := FALSE; Ack := FALSE flag := TRUE; ELSIF (NOT alarm) AND Ack THEN flag := FALSE; END_IF (* if the system is in alarm but there is a logged operator that acknowledge the alarm the system allows the valve opening.*) IF (VisuElems.CurrentUserGroupID <> 0) AND Ack AND Alarm AND PushBottonOpening THEN Valve := TRUE; ELSIF (VisuElems.CurrentUserGroupID = 0) AND Alarm THEN valve := FALSE; END_IF The problem I have is in the last 5 lines of the code: Even if there is a logged in user, the GroupID variable is subjected to a refresh that cyclically set for an instant it to 0 and this close the valve making difficult to the user to work Now I solved it creating a time hysteresys cycle but it is not a good solution. Someone is able to explane me why the GroupID variable is sobjected to this refresh and how to stabilize to avoiding it? Thank you in advance, Riccardo
Last updated: 2023-11-10

Post by e71828 on how to calculate the D-term in PID? ^{CODESYS Forge talk (Post)}
D.OUT: 5000 -> 2214 ->662 -> -888; X = ACTUAL= -100; SET_POINT = 0; Error = 100; D.OUT = 5000 = 100 / 0.02; Y = 0.1*(100 + 0.04 * 5000) = 30; X = ACTUAL= -70; Error = 70; D.OUT = (30-70)/0.02 <=> -1500;???? How to explain this?
Last updated: 2024-06-27

Post by timvh on displaying all incoming CAN bus messages ^{CODESYS Forge talk (Post)}
Create a (global) array of Messages: aMessage : ARRAY[0..NR_OF_MESSAGES-1] OF CAN.RxMESSAGE; Then add each received message to the array. IF UserVarGlobal.g_countMsg_RPMset < NR_OF_MESSAGES THEN aMessage[UserVarGlobal.g_countMsg_RPMset] := Message; UserVarGlobal.g_countMsg_RPMset := UserVarGlobal.g_countMsg_RPMset + 1; END_IF
Last updated: 2024-07-22

Post by timvh on How to implement an interface (IElement)? ^{CODESYS Forge talk (Post)}
See: https://forge.codesys.com/prj/codesys-example/element-collect/home/Home/ This contains an application "OnlineChangeSafeLinkedListExample". What you should do is create a new interface which has your "Priority" property. Then your FB should extend the base element function block and implement your own interface: E.g. FUNCTION_BLOCK MyElement EXTENDS COL.LinkedListElementBase IMPLEMENTS I_MyInterface Then the __QUERYINTERFACE does the magic to check if your "element" also implements your interface. Something like this: // Compares this element with itfElement. // Returns 0 if the elements are equal, < 0 if the element is less than itfElement, // > 0 if the element is greater than itfElement. // This method will be called from sorted collections (e.g. |COL.SortedList|) to sort the elements. // IMPORTANT: The underlying value to be compared with MUST NOT be changed during the lifecycle of the object. METHOD ElementCompareTo : INT VAR_INPUT (* The element to compare*) itfElement : COL.IElement; END_VAR VAR itfIntElement : I_MyInterface; xResult : BOOL; END_VAR // We use integer iInt1 for sorting. xResult := __QUERYINTERFACE(itfElement, itfIntElement); IF xResult THEN IF iInt1 < itfIntElement.Priority THEN ElementCompareTo := -1; ELSIF iInt1 > itfIntElement.Priority THEN ElementCompareTo := 1; ELSE ElementCompareTo := 0; END_IF ELSE ElementCompareTo := -1; END_IF
Last updated: 2024-07-22

Post by bruceae on Ethernet/IP Scan ^{CODESYS Forge talk (Post)}
Hello, I have a robot configured as a Generic Ethernet Module under Ethernet/IP Scanner. I can not see the change of state of the outputs coming from the robot on the codesys side in real-time. (The robot has it's own internal program that would changes the values of remote outputs 0-3 off and on). Also when I send data down to the inputs of the robot it doesn't transfer over as expected. As an example I'll send to the robot's input bit 0 a value of 1. It doesn't see that value change. However, when I write that input bit 0 back to a value of 0, the robot changes state and shows a value of 1. And if I change the state of a different bit, the other bits update properly, except for the bit that I changed. Any advice would be greatly appreciated, and if anything else is needed let me know.
Last updated: 2024-09-10

Post by ph0010421 on How to manage variable types larger than 64 bits - Ethernet/IP ^{CODESYS Forge talk (Post)}
So it's currently mapped to an array of BYTES? Can you create a UNION? TYPE sBytesString : UNION AsBytes: ARRAY[0..127] OF BYTE; AsString: STRING(128); END_UNION END_TYPE Map it to the bytes, read it in the STRING!
Last updated: 2024-09-23

Post by timvh on Readable IO names ^{CODESYS Forge talk (Post)}
IF you create an ENUM {attribute 'qualified_only'} {attribute 'strict'} TYPE E_IO : ( FIRST := 0, SECOND := 1 ); END_TYPE You should be able to access the array items like: IOCard_OUTPUT[E_IO.FIRST]
Last updated: 2024-09-28

Post by francois68 on CLEARING STORED ALARMS FROM ALARM MANAGER ^{CODESYS Forge talk (Post)}
Solution: VAR itfAlarmConfig: AlarmManager.IAlarmConfiguration; itfAlarmConfig7: AlarmManager.IAlarmConfiguration7; SCRIPT itfAlarmConfig := AlarmGlobals.g_AlarmHandler.GetAlarmConfiguration(0); IF __QUERYINTERFACE(itfAlarmConfig, itfAlarmConfig7) THEN itfAlarmConfig7.ClearHistory(FALSE); END_IF Works perfectly for me.
Last updated: 2025-02-21

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