Post by kdasystems on WebVisu on mobile devices ^{CODESYS Forge talk (Post)}
Hello I have a problem with web visu. When I open it to normal screen it is with good quality, but when I use it on mobile phone or tab then it is really bad quality, almost not possible to read the information. Can somebody help me what are the exact settings in the visu manager for this
Last updated: 2023-09-13

Post by trusty-squire on CNC - How to manipulate SMC_GeoInfo objects ^{CODESYS Forge talk (Post)}
Sometimes you just need to pose a question on a forum and re-read it to get clarity. pGeoInfo := SMC_GetObj(poq:=ADR(fbCncInterpreter.poqDataOut), n:=1); This won't work, I'm providing a pointer to a pointer, as poqDataOut is already a pointer! I just need to remove the ADR() and it works. pGeoInfo := SMC_GetObj(poq:=fbCncInterpreter.poqDataOut, n:=1);
Last updated: 2024-07-26

Post by lukebouchard on IFM-Sensor ADC READ ^{CODESYS Forge talk (Post)}
Get a different sensor that is 0-10V and 0-350 Bar. There is nothing you can reasonably do to boost the range of the sensor, and the PLC will only ever be 0-10V. Take away is to always be careful to match the sensor and PLC input ranges in the future.
Last updated: 2024-08-24

Post by timvh on Configuring a 2's compliment ^{CODESYS Forge talk (Post)}
You could create a DUT of the Type Union and add an array of 2 bytes + an Int. Then write the byte values in the array of the Union and read the Int. Or VAR iInt : INT; byHigh : BYTE := 2#1111_1111; byLow : BYTE := 2#1111_1111; END_VAR iInt := TO_INT(byHigh*16#100 + byLow);
Last updated: 2024-09-28

Post by tehthoams on Time will not read 12 ^{CODESYS Forge talk (Post)}
I know this post is a bit old, but i'm having this same issue: At noon, %t[hh:mm:ss tt] is displaying 00:00:00 PM There is no text variable, just using the default functionality of the visualization for the time display. This is running on an IFM CR1102 display. has anyone solved this?
Last updated: 2024-10-10

Post by pietrobalint on Persistent variables are not read after initialization ^{CODESYS Forge talk (Post)}
Hi, I realized that if I replug the power supply the persistent variables lost their value with the new software too. Cold reset do not affect the variables value but hardware reboot still reset the values. Application Composer can't be activated. What is the solution?
Last updated: 2024-10-11

Post by andrax on CodeSys Raspberry pi I2C driver not found ^{CODESYS Forge talk (Post)}
Sorry, wrong expression. You have a 64bit system, so do I. You can also use the 64bit runtime, but most bib and commands are 32bit and are not properly supported. I had read somewhere that there are problems with I2C. That's why I recommend switching to PI_SL and using the correct gpio.
Last updated: 2024-11-09

Post by helcioburd on How long can a WSTRING be in CodeSys V3? ^{CODESYS Forge talk (Post)}
Thank you, very useful information. I did a library for serial communication and could not understand the reason only 256 chars could be read (after sending more than 256). Following your suggestion, I can now send any number of chars and everything will be received.
Last updated: 2025-03-02

Post by wayne-riesterer on Assignment Efficiency - Repetitive Assignment vs IF statement ^{CODESYS Forge talk (Post)}
Thanks for your responses. I like to write the leanest possible code that I can because it makes it much easier to read/maintain/debug. OR_ELSE is what I was looking for. I wasn't sure if CodeSys short-circuited evaluation and I didn't realize this operator existed. Thanks!
Last updated: 2025-03-08

Post by hassaank on CODESYS V3+ WAGO PFC200+ MODBUS RTU ^{CODESYS Forge talk (Post)}
Hi everyone, I’m new to CODESYS and Wago devices, and I’m trying to set up Modbus RTU communication. I have a Wago PFC200 (8110) and a 750-653 RS485 module, and I want to read data from an energy meter using Modbus RTU. Thanks in advance for your help!
Last updated: 2025-03-17

Post by snguyen on Atomic and Shared memory? ^{CODESYS Forge talk (Post)}
Hi, I've read that you can perform Atomic instructions like AtomicReadLInt on variables. However, I'd like to know if this uses stdatomic internally. My main question is : Is it possible to share atomic types in shared memory with CodeSys. If so, what types should they be declared as? If not, are the atomic functions lock-free or does it use a mutex?
Last updated: 2025-04-15

Post by rmaas on Direct Pointers in IOMapping for EtherCAT with IoDrvEthercatLib.ETCSlave_Dia ^{CODESYS Forge talk (Post)}
Hi, Im not sure if this is what you mean, but i do succesfully use the IoDrvEthercatLib.ETCSlave.InputData and IoDrvEthercatLib.ETCSlave.OutputData to read from and write to beckhoff DI and DO cards. Very convenient as you can make an FB with an VAR_IN_OUT of type IoDrvEthercatLib.ETCSlave and only have to pass the slave reference... So i am not using .ETCSlave_Diag but .ETCSlave...
Last updated: 2024-02-13

Post by k2saki on How to define CONDITIONAL PRAGMA that effects all ST-POU in project. ^{CODESYS Forge talk (Post)}
I'd like to use same code/project in different devices. (RPi, PLC) I change some lines in some POU before compiling. (array size, file path, etc ) My question is How to define pragma that effects all ST-POU in project. Is it possible ? I've read this. https://help.codesys.com/api-content/2/codesys/3.5.12.0/en/_cds_pragma_conditional/
Last updated: 2024-05-12

Post by mgengler on Recipe Manager - Not Creating Recipe Files ^{CODESYS Forge talk (Post)}
Thanks for info... However, I changed the directory to: C:\ProgramData\CODESYS\CODESYSControlWinV3x64\58719825\PlcLogic\Recipes It still displays the content of this folder OK, however still will not write or read files. Is this the PLCLogic area you speak of? I also tried adding this path the the CodesysControl.cfg file. But still can't get it to work. Any additional direction would be appreciated!
Last updated: 2024-05-20

Post by eschwellinger on RecipeManCommands.ReloadRecipes ^{CODESYS Forge talk (Post)}
does this recipe example help you here? https://forge.codesys.com/prj/codesys-example/home/Home/ https://forge.codesys.com/prj/codesys-example/recipe-manageme/home/Home/ and additional keep in mind that all files which are generated / or read should be exist in the iecfilepath this means: for Windows (Control Win as example) c:\ProgramData\CODESYS\CODESYSControlWinV3x64\268E8ADF\PlcLogic for Linux /var/opt/codesys/PlcLogic
Last updated: 2024-05-24

Post by talhaali on Can't read Alarm Class from Alarm Storage ^{CODESYS Forge talk (Post)}
Hi, I am trying to access active alarms in code(As alarm count variable updates only when we go to to alarm table frame in visualization). I wrote following code but it is not working: VAR iCountActiveAlarms : INT; parritfActiveAlarms : POINTER TO ARRAY[0..0] OF IAlarm; itfAlarmManagerClientAll : IAlarmManagerClient; END_VAR AlarmManager.g_AlarmHandler.GetActiveAlarms( itfAlarmManagerClient :=itfAlarmManagerClientAll, iCountActiveAlarms => iCountActiveAlarms, parritfActiveAlarms => parritfActiveAlarms); The Value is always 0. Please help.
Last updated: 2024-06-06

Post by talhaali on Can't read Alarm Class from Alarm Storage ^{CODESYS Forge talk (Post)}
Hi, I am trying to access active alarms in code(As alarm count variable updates only when we go to to alarm table frame in visualization). I wrote following code but it is not working: VAR iCountActiveAlarms : INT; parritfActiveAlarms : POINTER TO ARRAY[0..0] OF IAlarm; itfAlarmManagerClientAll : IAlarmManagerClient; END_VAR AlarmManager.g_AlarmHandler.GetActiveAlarms( itfAlarmManagerClient :=itfAlarmManagerClientAll, iCountActiveAlarms => iCountActiveAlarms, parritfActiveAlarms => parritfActiveAlarms); The Value is always 0. Please help.
Last updated: 2024-06-06

Post by talhaali on Can't read Alarm Class from Alarm Storage ^{CODESYS Forge talk (Post)}
Hi, I am trying to access active alarms in code(As alarm count variable updates only when we go to to alarm table frame in visualization). I wrote following code but it is not working: VAR iCountActiveAlarms : INT; parritfActiveAlarms : POINTER TO ARRAY[0..0] OF IAlarm; itfAlarmManagerClientAll : IAlarmManagerClient; END_VAR AlarmManager.g_AlarmHandler.GetActiveAlarms( itfAlarmManagerClient :=itfAlarmManagerClientAll, iCountActiveAlarms => iCountActiveAlarms, parritfActiveAlarms => parritfActiveAlarms); The Value is always 0. Please help.
Last updated: 2024-06-06

Post by thieulam on Codesys access to DICTIONARY OBJECTS of ethercat (CoE ) Servo Drive ^{CODESYS Forge talk (Post)}
Hello to all! How can I read or write, via my main code (ST), to the registers present in the DO of my ethercat CoE servo drive? These objects appear in the list of the INITIALIZATION page, and from here I can only access them at startup. How do I access it in run time from my main PLC_PROGRAM?
Last updated: 2024-06-19

Post by osande on Trend/trace data ^{CODESYS Forge talk (Post)}
Ok, the problem is that the trend/trace system can't read function block instance data. The variables has to be stored directly under the program calling the FBs. Thus, FB variables to be trended/traced must be connected to variables declared in the program. Seems like a bug to me!
Last updated: 2026-03-13

Post by dclements on Feature Request: Read-Only References / Pointer-to-Const Support ^{CODESYS Forge talk (Post)}
I would like to suggest adding support for persistent read-only references or pointers in CODESYS, similar to a C++ pointer-to-const (const T*). For example, something conceptually similar to: POINTER TO CONSTANT ST_MyData or REFERENCE TO CONSTANT ST_MyData The important distinction is that the reference itself may still be passed around or reassigned, but the referenced object cannot be modified through that reference. CODESYS currently supports VAR_IN_OUT CONSTANT, which provides read-only reference semantics for parameters, but there does not appear to be an equivalent type that can be stored in a variable or returned from a method. A practical use case is a registry that owns long-lived definitions. The registry needs to retain ownership of the data while downstream systems maintain persistent references to it. Currently, the main options are: Return the struct by value, which loses reference semantics and requires a copy. Return POINTER TO ST_Definition, which allows consumers to modify registry-owned data. Convert the structure into a Function Block and expose a getter-only interface, which provides the desired encapsulation but introduces more complexity and memory overhead. A read-only reference/pointer type would allow libraries to expose persistent, zero-copy access to internally owned data while preserving encapsulation. This would be particularly useful for library APIs and object-oriented CODESYS architectures where ownership of data should remain with one component while other components are allowed to observe it. Similar requests for constant references/pointers have been discussed on CODESYS Forge previously, so this appears to be a recurring use case rather than something specific to one application.
Last updated: 2026-09-01

Post by smeitink on Timeout Error in Modbus Communication with WAGO PFC200 and iEM2050 Meter using 750-652 Module ^{CODESYS Forge talk (Post)}
Hi all, I'm looking for help with an issue I've come across while trying to facilitate Modbus communication between a WAGO PFC200 PLC using a 750-652 communication module and an iEM2050 Series Single Phase Energy Meter. I believe to have everything wired and setup correcty, but I keep running into a "Error time out" message, and by now I don't really know what else to try. My setup is as follows: A PFC200 Wago PLC, which has 2 750-652 Serial Interfaces extension modules connected to its field bus. I'm using one of these to talk to a Schneider iEM2050 - kWh-meter over modbus. I have connected terminal 23 (A) of the iEM2050 to connector 6 (A) on the 750-652. I have connected terminal 24 (B) of the iEM2050 to connector 2 (B) of the 750-652. I'm using 200mm of twisted together wires to connected them both, and I have placed a 120 ohm resistor between A and B at both ends. I've attached relevant pinout images to this post. I then wrote a simple program that configures the Mobus port, as per the datasheet of the iEM2050. You can find an image of the relavent page attached to this post too. This is my program: PROGRAM PLC_PRG VAR Master: FbMbMasterSerial; xIsConnected: BOOL; xError: BOOL; iIndex: INT := 1; xTrigger: BOOL; utQuery : typMbQuery := ( bUnitId := 1, // The Modbus unit or slave address bFunctionCode := 4, // Function code for reading input registers uiReadAddress := 1829, // adress for the Power on off counter uiReadQuantity := 1 // Quantity of registers to read ); iStep: INT; oStatusModbus: WagoSysErrorBase.FbResult; utResponseModbus: typMbResponse; xConnect: BOOL := FALSE; delayTimer: TON; END_VAR Master( xConnect:= xConnect, I_Port:= _750_652_24_1, udiBaudrate:= 9600, usiDataBits:= 8, eParity:= WagoTypesCom.eTTYParity.Even, eStopBits:= WagoTypesCom.eTTYStopBits.One, eHandshake:= WagoTypesCom.eTTYHandshake.None, ePhysical:= WagoTypesCom.eTTYPhysicalLayer.RS485_HalfDuplex, xIsConnected=> xIsConnected, xError=> xError, oStatus=> oStatusModbus, eFrameType:= WagoAppPlcModbus.eMbFrameType.RTU, tTimeOut:= T#5S, utQuery:= utQuery, xTrigger:= xTrigger, utResponse:= utResponseModbus); delayTimer(IN := TRUE, PT := T#3S); // Use the Q output of the timer to set xConnect after the delay IF delayTimer.Q THEN xConnect := TRUE; END_IF CASE iStep OF 0: //Wacht totdat de master de poort geopend heeft IF xIsConnected THEN iStep := 1; END_IF 1: //Stuur request naar de slave xTrigger := TRUE; iStep := 2; 2: //Wacht totdat de master klaar is met het afhandelen van de request IF NOT xTrigger THEN iStep := 3; END_IF END_CASE The TON delay before opening the port is due to a an error I encountered when opening it straight away. This seems to be a bug, as described here. However, the TON solved that particular issue. I tried reading multiple registers, but like I said, I still always end up with the "Error time out". What else can I test or try at this point?
Last updated: 2024-02-24

Post by hyys12 on Help understanding analog in-/outputs ^{CODESYS Forge talk (Post)}
Hello. I am currently working on a WAGO PLC, where I am trying to wrap my head around how the analog inputs and outputs work in codesys. I have looked far and wide on the internet, for a general introduction to the whole concept, but I have not had any luck with finding anything that helped me understand it better. The whole goal is for me to be able to read an analog input from a temperature sensor, as well as using an analog output, to control a frequency inverter. I know these have nothing to do with each other, but that is all I have on hand right now. I am trying to program this using Ladder Diagram. The only thing is, that every video/guide I have seen/read using LD, just adds a whole lot of function blocks, to do all kinds of stuff they don't explain. My general question is, how would one go ahead and read the analog input, as well as transmit an analog output? Is there some kind of specific function block I would have to use for this, or some great video I can watch, to understand the inner workings. Is it somehow possible to see the values the PLC recieved/sends? Regards.
Last updated: 2024-12-11

Post by dogulas on OPC UA C# client connecting to OPC UA CODESYS server ^{CODESYS Forge talk (Post)}
Ok, I have a simple test environment. From C#, using OPC UA, I can read DINTs, write DINTs, read Structs, but when I try to write a struct I get BadNotWritable. I am using Communication Manager, OPC UA Server, and IEC Symbol Publishing. I have a struct defined with one single DINT in it. The instance of the struct is in GVL. The struct is marked read/write in IEC Symbol Publishing. Any ideas? Pointers are welcome. public static async Task WriteStructA(byte[] structAData) { if (_session == null) throw new Exception("session is null"); // create a RequestHeader RequestHeader requestHeader = new RequestHeader { Timestamp = DateTime.UtcNow, TimeoutHint = 30000 // timeout in milliseconds }; // create an ExtensionObject to wrap the value to be written ExtensionObject extensionObject = new ExtensionObject( new ExpandedNodeId("GVL_StructA", 5), structAData ); // create a WriteValue object to hold the value to be written WriteValue writeValue = new WriteValue { NodeId = _structANodeId, AttributeId = Attributes.Value, Value = new DataValue(extensionObject) }; // put the WriteValue object into a WriteValueCollection object WriteValueCollection writeValueCollection = new WriteValueCollection() { writeValue }; // perform the write operation asynchronously WriteResponse writeResponse = await _session.WriteAsync( requestHeader, writeValueCollection, CancellationToken.None ); // check the result of the write operation if (writeResponse.Results[0] != StatusCodes.Good) throw new Exception("Write failed: " + writeResponse.Results[0]); }
Last updated: 2024-12-17

Post by pernockham on AC Persistence - values are not read from file during start? ^{CODESYS Forge talk (Post)}
Im struggling with the AC Persistence. AC persistence seems to work for any variable that is changed online and values are kept during reboot. However, if I try to edit the persistence files offline or replace the persistence files with a previously downloaded older persistence file (with modified values), the online value will not follow, as if the system did not at all read the file at boot? My testing sequence. - Edit a the value of a persistenced variable (with xSaveOnChange = True) - Save/download the associated persistence file, (and confirm the value has changed). - Edit the value online for a second time . - Stop runtime - Replace (upload) the persistence file with my previously downloaded file . - Coldstart/Warmstart/Start runtime - Whatever Im trying the value of my persistence variable will always be equal to that of my second edit as if the file is not read/considered during boot. What am I doing wrong?
Last updated: 2025-09-02

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