Post by george32 on Learning ST in an object-oriented way. ^{CODESYS Forge talk (Post)}
Dear all, I am currently creating a program in the ST language. Because the program is starting to grow nicely I would like to switch to a more object-oriented way of programming. (Like for example in Python). By surfing the internet I found out that Function Blocks is the best method for this. Now I would like to delve further into this, with all the possibilities that Function Blocks have only I cannot find a clear course, explanation of what everything is around the function block thing and how to approach everything. I find the standard documentation around Function Blocks rather abstract and the examples are minimal. Therefore I am looking for a page/course/document explaining object oriented programming in Codesys (or other PLC programming environment). Do you have any recommendations on this?
Last updated: 2025-06-10

Post by user3000 on Can't find an Extended Pulse Timer (TP and LTP) ^{CODESYS Forge talk (Post)}
I came up with an FBD that seems to be working, although it may not be a true Retriggerable Pulse timer. There may be some delay associated with the two MOVE functions and ADD function I incorporated. I'd be interested if anyone is able to come up with something cleaner. I am surprised that this is not a built-in function block of the CodeSYS library. This is a common feature of multi-function timer relays. I also attached a page from the cut sheet of a Schneider relay that shows 10 timing functions. Looks like the CodeSYS library has built-in function blocks for only 3 of the 10.
Last updated: 2023-12-21

Post by totorovic on How to display the application name on a visualization (V3.5.16) ^{CODESYS Forge talk (Post)}
You could use the function AppGetApplicationInfo from CmpApp library. https://content.helpme-codesys.com/en/libs/CmpApp/Current/AppGetApplicationInfo.html
Last updated: 2024-05-14

Post by timvh on Display minutes as hours & minutes ^{CODESYS Forge talk (Post)}
You could use the Modulo function to get the minute part from the total minutes: Minutes := TotalMinutes MOD 60;
Last updated: 2024-05-27

Post by timvh on Sensor not set ^{CODESYS Forge talk (Post)}
Your function block instance is not called, so the code is not executed to set the light on when the button is pressed.
Last updated: 2024-05-27

Post by ph0010421 on OSCAT Scale_r function not working in LD 4.60 works in LAD2 on 3.5.21sp3 ^{CODESYS Forge talk (Post)}
Is that rung definitely being executed? Is the POU called?
Last updated: 2025-10-23

Post by shaunvdm on OSCAT Scale_r function not working in LD 4.60 works in LAD2 on 3.5.21sp3 ^{CODESYS Forge talk (Post)}
Yes it is called
Last updated: 2025-10-24

Post by wchin on Passing EtheNetIP adapter device into a Function Block to access it's IO ^{CODESYS Forge talk (Post)}
We are creating helper function blocks for our VFD(EtherNetIP). How should I set it up so that I can pass the device into and out of the Function Block so that ideally I can access the IO of the device by devicename.channelname. So something like for example we have a VFD with a start bit that is in the ControlWord channel and a SetVelocity that is a channel. And we want to create a Function Block called StartVFD. So I declare something like: FUNCTION_BLOCK StartVFD VAR_IN_OUT device: ioDrvEthernetIP.RemoteAdapter; END_VAR VAR_INPUT velocity : REAL; So in the code it would look something like device.SetVelocity := velocity; device.ControlWord.6 := True; We have a pretty basic eds file for our VFD and can update it if necessary. Thanks in advance.
Last updated: 2025-10-28

Post by wchin on Passing EtheNetIP adapter device into a Function Block to access it's IO ^{CODESYS Forge talk (Post)}
We are creating helper function blocks for our VFD(EtherNetIP). How should I set it up so that I can pass the device into and out of the Function Block so that ideally I can access the IO of the device by devicename.channelname. So something like for example we have a VFD with a start bit that is in the ControlWord channel and a SetVelocity that is a channel. And we want to create a Function Block called StartVFD. So I declare something like: FUNCTION_BLOCK StartVFD VAR_IN_OUT device: ioDrvEthernetIP.RemoteAdapter; END_VAR VAR_INPUT velocity : REAL; So in the code it would look something like device.SetVelocity := velocity; device.ControlWord.6 := True; We have a pretty basic eds file for our VFD and can update it if necessary. Thanks in advance.
Last updated: 2025-10-28

Post by wchin on Passing EtheNetIP adapter device into a Function Block to access it's IO ^{CODESYS Forge talk (Post)}
We are creating helper function blocks for our VFD(EtherNetIP). How should I set it up so that I can pass the device into and out of the Function Block so that ideally I can access the IO of the device by devicename.channelname. So something like for example we have a VFD with a start bit that is in the ControlWord channel and a SetVelocity that is a channel. And we want to create a Function Block called StartVFD. So I declare something like: FUNCTION_BLOCK StartVFD VAR_IN_OUT device: ioDrvEthernetIP.RemoteAdapter; END_VAR VAR_INPUT velocity : REAL; So in the code it would look something like device.SetVelocity := velocity; device.ControlWord.6 := True; We have a pretty basic eds file for our VFD and can update it if necessary. Thanks in advance.
Last updated: 2025-10-28

Post by razebones on sdo read write codesys 3.5 ^{CODESYS Forge talk (Post)}
ENG For some reason, I can't bind a variable to the data parameter. Also, why does only the sdo_read4 function work for me? I also can't write through sdo_write4. I can only view the received values via sdo_read4. Please help me with this task. Moreover, I tried to write the values through sdo write 4 and for a while the data stopped being written and I overwritten it manually and sdo read4 started working again and at the same time they do not want to work in the main task. RU Я не могу почему то привязать переменную к параметру data. Так же у меня почему работает только функция sdo_read4 так же не могу записать через sdo_write4. Могу только просматривать полученные значения через sdo_read4. Помогите пожалуйста с этой задачей. Причём я попытался записать значения через sdo write 4 и у меня на какое то время перестали записываться данные и перезаписал вручную и sdo read4 начал работать снова и одновременно они не хотят работать в main task.
Last updated: 2025-04-01

Post by serwis on Dynamic target position tracking ^{CODESYS Forge talk (Post)}
Hello, I am trying to control a servo drive and dynamically set its position. I control the drive via EtherCAT with a cycle time of 500us. I use the MC_MoveAbsolute block for this. The problem is that when using a PID controller, I generate the positions I want the drive to move to on an ongoing basis, and I would like the position to be set immediately. The MC_MoveAbsolute block must receive a rising edge to execute, and I would like the movement to be performed without waiting for this edge. I have created a function that generates a rising edge every 1 ms, but I am unable to change this time to 500 µs because the TON function does not support times shorter than 1 ms. Below is the code to call the rising edge: IF Exe = TRUE THEN delay1(IN:=TRUE, PT:=T#1MS); IF delay1.Q = TRUE THEN Exe := FALSE; delay1(IN:=FALSE); END_IF END_IF IF Exe = FALSE THEN delay(IN:=TRUE, PT:=T#1MS); IF delay.Q = TRUE THEN Exe := TRUE; delay(IN:=FALSE); END_IF END_IF END_IF Here is the code for calling the MC_MoveAbsolute function: MoveDegree( Axis:= Tilt, Execute:= Exe, Position:= position_target - (base_angle_real * feedforward_turn), Velocity:= vel, Acceleration:= acc, Deceleration:= dec, Jerk:= jerk, Direction:= MC_DIRECTION.shortest, BufferMode:= MC_BUFFER_MODE.Aborting, Done=> , Busy=> , Active=> , CommandAborted=> , Error=> , ErrorID=> ); I realize that there are probably better methods for performing this type of task. How can I implement motion with a dynamically changing setpoint? THANKS
Last updated: 2025-09-05

Post by jarnok on How to know if output if function block is used ^{CODESYS Forge talk (Post)}
Hi, Is it possible to know of an output of a function block is used? I've found there is a way to find unused inputs of a fb, through the attribute: is_connected. But I'm wondering if the same can be done for an output. Thanks in advance!
Last updated: 2024-10-15

Post by pascaljt on Warning code C0373 ^{CODESYS Forge talk (Post)}
Hello, I wrote a function block for a controller but I have a warning code C0373 "expression or part of it has no effect" and the sub routine which contain my function block is underlined in blue. Despite, the FB works perfectly. Do you know why I have this warning ? Thanks. Pascal.
Last updated: 2024-10-30

Post by jbu0105 on Setpoints Delta robot ^{CODESYS Forge talk (Post)}
Hello, I am working on a delta robot. Now was i wondering if anyone knows whats the best way to program the different setpoints for the delta Robot. I would like to use the functions MC_MoveLinearAbsolute and the function MC_MoveCircularAbsolute with the transition on this function. Can anyone help me with al small setup?
Last updated: 2025-04-16

Post by jbu0105 on Setpoints Delta robot ^{CODESYS Forge talk (Post)}
Hello, I am working on a delta robot. Now was i wondering if anyone knows whats the best way to program the different setpoints for the delta Robot. I would like to use the functions MC_MoveLinearAbsolute and the function MC_MoveCircularAbsolute with the transition on this function. Can anyone help me with al small setup?
Last updated: 2025-04-16

Post by andrej on Creating, using an external Function. ^{CODESYS Forge talk (Post)}
Hello, many thanks for your reply. I checked the logs. It seems that dll is not loaded. However other dll such as the Webserver are loaded. Could you tell me what I need to do such that my dll is loaded. (Furthermore I changed the C-Function a bit. I used the M4.exe from the SDK.) Many thanks.
Last updated: 2025-04-23

Post by tvm on Cannot pass array of constant size to a function as a reference ^{CODESYS Forge talk (Post)}
maybe this would be a better approach, then you don't have to pass the constant at all. FUNCTION fun : INT VAR_IN_OUT arr: ARRAY[*] OF INT; END_VAR VAR lower: DINT; upper: DINT; END_VAR lower:= LOWER_BOUND(arr, 1); upper:= UPPER_BOUND(arr, 1); see here as well https://help.codesys.com/api-content/2/codesys/3.5.12.0/en/_cds_datatype_array/
Last updated: 2024-01-08

Post by tvm on Cannot pass array of constant size to a function as a reference ^{CODESYS Forge talk (Post)}
It will be a reference, because it's a VAR_IN_OUT. it's a little weird debugging the array online. It just shows as a POINTER TO INT, and you can't actually see the array from the function side. But you can still work with it as a normal array, not a pointer.
Last updated: 2024-01-09

Post by timvh on Limiting Memory Access of an Array to Within its Bounds ^{CODESYS Forge talk (Post)}
Add the object "POU for Implicit Checks" to your application, then select "Bounds check". This will create a function which is automatically called each time an array is write accessed. In the function you can handle "out of bounds" situations. By default it will be limited to its lower or upper bound.
Last updated: 2024-03-06

Post by siscu on Raspberry Pi: List of available example applications ^{CODESYS Forge talk (Post)}
Could this be turned into a library? I'd love for a way to have the main program call a function block method using the program's I2C_master device. I assume I should be passing the master as a variable for the function block, but I don't see how that could be achieved
Last updated: 2024-05-15

Post by kumareasu on Persistent variable storage ^{CODESYS Forge talk (Post)}
Is there any function function block which can store the persistent variable in HDD/SSD immediatley. My observation is that the persistent variable is getting stored when we shut down or restart the system (Windows+ CoDeSys RTE SL ). the persistent variables are not stored in HDD/SSD, if I power off the system without proper shutdown. Seeking your feedback.
Last updated: 2024-06-12

Post by nguyenbao on file library ifm CR2033 .lib in the CODESYS v2.3 ^{CODESYS Forge talk (Post)}
Hello everyone, I have a program file that uses the CR2033 module of iFM. I noticed that the program uses the CR2033 function, but in the CodeSystem software I installed from the file downloaded from iFM, I couldn't find the library containing this function. Where can I find the CR2033_XX.lib library?
Last updated: 2026-04-22

Post by macros8 on Alarm Management - latched variable represented as Text list ^{CODESYS Forge talk (Post)}
Hi, I haven´t noticed you put the comment here. I thing it´s a bit different. What I want is to have detail errors of technology in data type e.g. INT. This variable I would latch to the corresponding error msg but I would like to get it convert to text from the text list and not keep it in INT form. Example. Main error Valve Error: SubErrors 1 - Both sensors 2 - Not retracted in time 3 - Not pulled out in time In HMI Main error + latch SubErrors => "Valve Error: Both sensors" The benefit is that text lists are part of translation and can be easily manipulated. I know I can create whole string msg in PLC but then, it lose advantage of Alarm management. Thanks. M.
Last updated: 2023-11-07

Post by jzhvymetal77 on VarAccGetAddress does not return the correct address for TYPE_ARRAY or TYPE_USERDEF. ^{CODESYS Forge talk (Post)}
VarAccGetAddress does not return the correct address for TYPE_ARRAY or TYPE_USERDEF. When you use VarAccGetNode, it returns a proper IBaseTreeNode if you provide the full path of an array element or structure element, and it even provides the correct data type. The problem is that with TYPE_ARRAY, it returns the start address of the array rather than the indexed element. With TYPE_USERDEF, it only returns the offset of the element instead of the actual address. This causes many issues with nested structures or arrays of structures, since it requires manually calculating the address based on the parent IBaseTreeNode. See attached image and example.
Last updated: 2025-08-28

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