Post by pietrobalint on Persistent variables are not read after initialization ^{CODESYS Forge talk (Post)}
What do you mean it is part of the licensefree part? I attached my error message.
Last updated: 2024-10-20

Post by bjarne-pagaard on OPC UA Server Status on Win RTE ^{CODESYS Forge talk (Post)}
The Control RTE is 3.5.18.20, using the symbol configuration for exposure of variables.
Last updated: 2024-10-22

Post by timvh on Is there a pragma for init/instantiation of local variables in FB (like in Methods) ^{CODESYS Forge talk (Post)}
Do you mean VAR_TEMP? https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_vartypes_var_temp.html
Last updated: 2024-11-05

Post by timvh on Using a raspberry pi and NVLs to log variables outside of Codesys ^{CODESYS Forge talk (Post)}
Yes, this will work.
Last updated: 2025-11-21

Post by jbcregen on Accessing parameters from a structure or function block with the web interface ^{CODESYS Forge talk (Post)}
I have a project with hundreds of OPC-UA variables available on the network. A lot of these variables are used actively in various scripts that run in background in the OS (Linux). I'm experimenting with Automation Server and I have a hard time understanding how the web interface populates its parameters list for a given PLC (<plc details="" parameters="" for="" plc="" 'xyz'="">).</plc> In this page, it looks like the only variables available are the ones that are of a "base" type : bool, TIME, String, INT, etc. All the variables that are nested into function blocks or structures are not available in the web interface, even if they are available to any OPC-UA client. Is this a limitation of the Automation Server or is there something that can be done in Codesys?
Last updated: 2025-12-01

Post by gatto on variables between two applications ^{CODESYS Forge talk (Post)}
No. As you can see in the uploaded image, in my test project, I have a variable list GVL_1 which is located in appication_1. But if I write in POU_2, which is instead found in application 2, I cannot find the variables of GVL_1. it seems that the GVLs are children of each app
Last updated: 2024-06-24

Post by jasperclauwaert on Persistent Retain Variables Not Visible in Online View (WAGO PFC100 + CODESYS) ^{CODESYS Forge talk (Post)}
Hi everyone, I’m working on a WAGO PFC100 with CODESYS. During development everything worked fine, but in the final stage I set several variables to PERSISTENT RETAIN. When I go online, most of these persistent variables cannot be monitored. Instead, I see: <Value of the expression cannot be retrieved> Interestingly, a few variables do show their values correctly, but the majority do not. The variables are not used as pointers or in any unusual way. The application compiles and runs without errors. Has anyone experienced this before? Is this a known issue with PFC100 or CODESYS? Any ideas on what could cause this behavior? Thanks in advance! Jasper
Last updated: 2025-10-23

Post by jasperclauwaert on Persistent Retain Variables Not Visible in Online View (WAGO PFC100 + CODESYS) ^{CODESYS Forge talk (Post)}
Hi everyone, I’m working on a WAGO PFC100 with CODESYS. During development everything worked fine, but in the final stage I set several variables to PERSISTENT RETAIN. When I go online, most of these persistent variables cannot be monitored. Instead, I see: <Value of the expression cannot be retrieved> Interestingly, a few variables do show their values correctly, but the majority do not. The variables are not used as pointers or in any unusual way. The application compiles and runs without errors. Has anyone experienced this before? Is this a known issue with PFC100 or CODESYS? Any ideas on what could cause this behavior? Thanks in advance! Jasper
Last updated: 2025-10-23

Post by vsgn on Passing properties as VAR_IN_OUT variables. ^{CODESYS Forge talk (Post)}
Hi, in my experience, the best options for such a case could be: 1. Pass a FunctionBlock via VAR_IN_OUT, containing all variables, mehods and properties needed for the logic of this graphic element (be aware of implementing correcly both get and set accessor for properties) 2. Pass an Interface via VAR_INPUT, of which you can use obviously only Properties and Methods. This is much more elegant for me. Here, you can just pass directly the instance of a FunctionBlock implementing such Interface as input. Hope you'll find this suggestions useful.
Last updated: 2025-05-13

Post by fless on FB having single input but initialized with Array ^{CODESYS Forge talk (Post)}
Why will it retain the sum value from the last call? This is how PLC work. Usually variables only get initialized after a download or a reset (i.e. power loss). RETAIN variables are saved in a special kind of RAM and keep their value after a power loss. To initialize variables on every call of your FB use the VAR TEMP block. VAR_TEMP sum : INT; END_VAR
Last updated: 2024-05-07

Post by ameba on PersistentVars and Webvisu Element ^{CODESYS Forge talk (Post)}
hello everyone I would like to try to better understand how persistent variables work. I created some boolean variables in the PersistentVars section initialized to the value TRUE. I have tied these boolean variables to toggle switches placed inside the HMI interface pages. Once the PLC program is started, the lever selectors, if operated, change their state, at least at a graphical level, but the persistent variables do not undergo any variation. Initially the above variables were declared as simple global variables, in this case the operation with the levers was correct; I then tried to transform them into persistent ones with the aim of using them as "settings saver" Thank you for support Bye
Last updated: 2025-04-03

Post by ihatemaryfisher on Sorting array of any-sized structure ^{CODESYS Forge talk (Post)}
With that I could make an array of varying size, but would still have to define the array type in the function's declaration VAR_IN_OUT stArray: array [*..*] of <pre-defined data type> END_VAR I wanted a function that could take an array of any type (e.g., a structured VAR) as an input. That way I could call it in multiple POUs to handle different arrays structures.
Last updated: 2023-08-18

Post by gseidel on MC_Phasing state explenation ^{CODESYS Forge talk (Post)}
Hi kenth1973, no, we do not have this kind of information on internal variables. iPhasingState has been removed and is no longer present in current versions of SoftMotion. Best regards, Georg
Last updated: 5 days ago

Post by timvh on Management of a PLC network from a remote station ^{CODESYS Forge talk (Post)}
Maybe the CODESYS HMI is a good solution. https://store.codesys.com/en/codesys-hmi-sl-bundle.html Run this on the remote main control station. In the HMI application you can add the data source manager and to this manager you can add Data sources. A data source has a reference to the PLC you want to connect to and can get access to the variables of the PLC application. You can then use these variables in the visualization of the HMI application.
Last updated: 2023-12-04

Bug in LD/FBD editor - ModbusFB.ClientRequest does not show ETrigTo-inherited variables ^{CODESYS Forge talk (Thread)}
Bug in LD/FBD editor - ModbusFB.ClientRequest does not show ETrigTo-inherited variables
Last updated: 2022-12-04

How to intercept a variation in the RetainPerstist variables (for saving to file) ^{CODESYS Forge talk (Thread)}
How to intercept a variation in the RetainPerstist variables (for saving to file)
Last updated: 2018-08-03

Unable to get retain variables to work in a specific Raspberry Pi project ^{CODESYS Forge talk (Thread)}
Unable to get retain variables to work in a specific Raspberry Pi project
Last updated: 2019-12-03

codesys gloal variables to .csv file generaion by using CAA file library. ^{CODESYS Forge talk (Thread)}
codesys gloal variables to .csv file generaion by using CAA file library.
Last updated: 2019-04-08

How to mapping TTTech hy-94 PLC IO to global variables in codesys 2.3 ^{CODESYS Forge talk (Thread)}
How to mapping TTTech hy-94 PLC IO to global variables in codesys 2.3
Last updated: 2022-09-15

Can't link process data variables to IO from a positionsensor while using a demo soft PLC ^{CODESYS Forge talk (Thread)}
Can't link process data variables to IO from a positionsensor while using a demo soft PLC
Last updated: 2022-03-04

Variables retain, graceful shutdown, csv configuration file and visu, logfile and web log connection ^{CODESYS Forge talk (Thread)}
Variables retain, graceful shutdown, csv configuration file and visu, logfile and web log connection
Last updated: 2018-03-26

Update variables when OPC UA Client updates. Error ID: 268468277 BadAttributeIdInvalid ^{CODESYS Forge talk (Thread)}
Update variables when OPC UA Client updates. Error ID: 268468277 BadAttributeIdInvalid
Last updated: 2024-01-08

Persistence Variables missing and DO NOT retain from Persistence Channel when using Boot Application ^{CODESYS Forge talk (Thread)}
Persistence Variables missing and DO NOT retain from Persistence Channel when using Boot Application
Last updated: 2024-05-15

Post by nano on variables between two applications ^{CODESYS Forge talk (Post)}
use an gvl for interact variables beetween apps and threads. this should work
Last updated: 2024-06-23

Persistent Retain Variables Not Visible in Online View (WAGO PFC100 + CODESYS) ^{CODESYS Forge talk (Thread)}
Persistent Retain Variables Not Visible in Online View (WAGO PFC100 + CODESYS)
Last updated: 2025-10-23

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