Post by koppit on SysComRead Timeout Parameter ^{CODESYS Forge talk (Post)}
Im using SysCom ver. 3.5.17.0 and seem to have the same issue on a Raspberry Pi. It's not waiting for the requested number of bytes, no matter if "ulTimeout := SYS_INFINITE" or any other value. The only solution I have found is to stall the program to allow the serial port to recieve the data.
Last updated: 2024-06-26

Post by vtec35 on search runtime 4.9.0.0 for pi 3 ^{CODESYS Forge talk (Post)}
Hello everyone, following corrupted data on the SD card of our Pi3B+ provided with a machine, we reinstalled a CODESYS image for Raspberry Pi, but we cannot find the 4.9.0.0 runtime that is compatible with the project. Currently, the machine is on 4.1.0.0, and we tried a more recent version 4.13.0.0, but there are error messages. Thanks in advance.
Last updated: 2025-10-24

Post by kporter on SoftMotion, accessing PDO input data via object ref/pointer ^{CODESYS Forge talk (Post)}
Now that SP21 is out, what's the answer? I want to get a pointer to the TxPDO and RxPDO structs. I can generate a STRUCT declaration from the ESI file with a bit of Python. I just need to get the pointer from the ETC_Slave.
Last updated: 2025-10-29

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 rita56re on Temu Coupon Code $100 off➧ [act892435] for First-time Users ^{CODESYS Forge talk (Post)}
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Last updated: 2024-10-26

Post by clarenced on Multiple applications on one device sharing variables. ^{CODESYS Forge talk (Post)}
I am looking for an example of how to run 2 applications on 1 device that would have global variables shared between the two apps. In this case what I am trying to do is to have the main program logic run as one application and then have the visualization run as a second application. I find this https://us.store.codesys.com/media/n98_media_assets/files/000013-F/0/Multiple%20Applications_en.pdf, that talks about exactly what I want to do, but I can't find the download. The main reason I want to do this is for download speed. Right now it takes at least a minute to download our application to the PLC. A simple program downloads to the PLC in a very short time, but add visualization and the download time gets much longer. If I could download the program separately from the visualization I think that a simple program change would take very little time to download. I have tried create a GVL in the POUs view. This partly works in that both applications can see the GVL, but they each create their own instance of it and the variables are not shared between the two apps. There are ideas of using OPCUA but this raises problems with licensing and having to move any variable that needs to be shared into the Symbol Configuration. This adds a lot of management to keep this up to date. Any ideas would be appreciated thanks.
Last updated: 2025-02-20

Post by brouwyka on JSONByteArrayWriter string result incorrect order ^{CODESYS Forge talk (Post)}
Additional note: When doing all additions to a JSON array one after another without additions outside the array inbetween (and no more additions to the array after an item outside the array has been added) - which is not a viable solution for us as we might add items to any of the arrays at any time, but we tested regardless to be thorough - we get the following result: { "id": "machine_1", "readings": [ { "temp_mid": 153.8 }, { "temp_mid": 98.3 } ], "status": "RUNNING" } This mostly matches our expected outcome, aside from the JSONByteArrayWriter not adding indenting before closing square brackets ("]") at all. That doesn't matter for JSON of course, as it's not sensitive to indenting, but it's still a bug regardless. Also, it adds an unnecessary newline between items in the array (at least when having an array of objects, we haven't tested with arrays of primitives). I also want to reiterate that this is not a viable workaround for the issue for us - we have to be able to add to any array at any time, which should be possible according to the docs, and we are 100% sure indexes are correctly being managed and built up by the JSONBuilder and our wrapper (to track the index of each array & the latest item added to each exactly to make use of the documented possibility to add anything anywhere in the JSON at any time as long as you keep track of the returned indexes) around it.
Last updated: 2026-06-10

Comments in arrays and assigning RST coil's to 600 outputs ^{CODESYS Forge talk (Thread)}
Comments in arrays and assigning RST coil's to 600 outputs
Last updated: 2023-08-31

How to use MC_Home and Configure Task ^{CODESYS Forge talk (Thread)}
How to use MC_Home and Configure Task
Last updated: 2018-04-20

PFC 200 memory gets full and hangs ^{CODESYS Forge talk (Thread)}
PFC 200 memory gets full and hangs
Last updated: 2020-04-05

General question about Codesys and control RTE ^{CODESYS Forge talk (Thread)}
General question about Codesys and control RTE
Last updated: 2020-01-27

A few quick Ethernet/IP and ModBus questions ^{CODESYS Forge talk (Thread)}
A few quick Ethernet/IP and ModBus questions
Last updated: 2021-02-22

raspberry pi B+ GPIO 5 and 6 always TRUE ^{CODESYS Forge talk (Thread)}
raspberry pi B+ GPIO 5 and 6 always TRUE
Last updated: 2016-10-07

Scaling Problems mit Visualization and iPAD Pro Safari ^{CODESYS Forge talk (Thread)}
Scaling Problems mit Visualization and iPAD Pro Safari
Last updated: 2022-06-01

Encryption of application and communication not working ^{CODESYS Forge talk (Thread)}
Encryption of application and communication not working
Last updated: 2021-11-04

Running and A-axis smoothly at constant velocity ^{CODESYS Forge talk (Thread)}
Running and A-axis smoothly at constant velocity
Last updated: 2016-01-22

Using it with beckhoff CX9020 and getting PLC disconnections ^{CODESYS Forge talk (Thread)}
Using it with beckhoff CX9020 and getting PLC disconnections
Last updated: 2013-09-09

Low latency communication between raspberry pi and arduino ^{CODESYS Forge talk (Thread)}
Low latency communication between raspberry pi and arduino
Last updated: 2019-06-09

Did a library update and now can't open project ^{CODESYS Forge talk (Thread)}
Did a library update and now can't open project
Last updated: 2023-09-25

Initialization of visualization variables and cyclic code execution ^{CODESYS Forge talk (Thread)}
Initialization of visualization variables and cyclic code execution
Last updated: 2023-10-01

Threads and TID created by CODESYSControl Win V3 ^{CODESYS Forge talk (Thread)}
Threads and TID created by CODESYSControl Win V3
Last updated: 2023-10-02

How to switch between dynamic IP address and dynamic? ^{CODESYS Forge talk (Thread)}
How to switch between dynamic IP address and dynamic?
Last updated: 2023-11-08

Codesys Raspberry Runtime 4.10.0.0 and RSM Utility 3.5.19.0 ^{CODESYS Forge talk (Thread)}
Codesys Raspberry Runtime 4.10.0.0 and RSM Utility 3.5.19.0
Last updated: 2023-11-21

About byte swap and convert into 16 bits ^{CODESYS Forge talk (Thread)}
About byte swap and convert into 16 bits
Last updated: 2023-12-04

Alarm Management - Import and Export of AlarmGroup ^{CODESYS Forge talk (Thread)}
Alarm Management - Import and Export of AlarmGroup
Last updated: 2023-12-06

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