Post by mrkm-dic on UC20-M4000 Redundancy – Application is not automatically synchronized and redundancy breaks after online change ^{CODESYS Forge talk (Post)}
Hello, I am currently testing redundancy using two UC20-M4000 controllers with CODESYS Control SL. The basic redundancy functionality (Active/Passive switching and failover) works, but I am experiencing problems when updating the application. Environment Controller: Weidmüller UC20-M4000 OS: u-OS Runtime: CODESYS Control SL 4.12.1.0-1 Redundancy link: dedicated Ethernet connection between the two controllers Time synchronization: NTP configured, time difference between controllers is about 1–2 seconds Current behavior Application synchronization When I download a modified application to PLC1 (Active controller), the application is not automatically copied to PLC2 (Passive controller). However, when I perform a path swap, the application download to PLC2 starts automatically. My expectation was that the Passive controller would automatically receive the updated application after downloading to the Active controller. Online change When performing an online change, redundancy is lost and the controllers switch to Standalone mode. Typical log messages include: RedundancySynchronize called Redundancy failover itself works correctly. The application boot project exists on both controllers (Application.app and Application.crc). Network interfaces are up and correctly configured. Question Is this behavior expected when updating the application in a redundant UC20-M4000 setup? Should the Passive PLC automatically receive the updated application, or is manual synchronization required? Any advice or recommended configuration for stable redundancy during online change and application download would be greatly appreciated. Thank you.
Last updated: 2026-03-16

Post by nickpoon on SysProcessCreate stopped working after SP21? ^{CODESYS Forge talk (Post)}
I'm going through the process of updating the CODESYS Project a machine to 3.5 SP21 (old version was 3.5 SP20). One function that stopped working when upgrading was SysProcessCreate. I need to run a .exe file that is located in C:\Program Files\MQTTStream. Some initial searching suggested that there are new security rules that prevent the SoftPLC from reading/writing files to outside of its Device folder (located here - C:\Windows\System32\config\systemprofile\AppData\Roaming\CODESYS\CODESYSControlWinV3x64\24FD6770) Relocating files helped fix my JSON file reader/writer functions (which were failing previously), but not the case for SysProcessCreate. I've even attempted to just run window's cmd.exe and with: pszCommandLine = 'cd /d C:\Windows\System32\config\systemprofile\AppData\Roaming\CODESYS\CODESYSControlWinV3x64\24FD6770\PlcLogic\MQTTStream & sift-proxy.exe --grpc_uri="https://grpc-api.siftstack.com" --api_key="xxxxxxxxxxxxxxxxxxx" mqtt-client --broker_ip=10.0.10.101 --broker_port=1883 --config_file="mqtt_telemetry_config.json" --username Plantd --password 1234 --stream_metrics --storage_path="sift-proxy-logs"' I have not been able to find a lot of documentation on this, and I suspect the new update may have created a bug for SysProcessCreate. Any help would be greatly appreciated
Last updated: 2026-02-02

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Last updated: 2024-10-26

Edgelogix-rpi-1000-cm4102032 SPI port connection to PiFace I/O Driver in CodeSys. ^{CODESYS Forge talk (Thread)}
Edgelogix-rpi-1000-cm4102032 SPI port connection to PiFace I/O Driver in CodeSys.
Last updated: 2023-08-21

Post by lepewe4ka on Sysmac Studio to Codesys ^{CODESYS Forge talk (Post)}
Could you send me an example? I would like to generate a data structure using XML files.
Last updated: 2023-09-20

Post by lepewe4ka on Sysmac Studio to Codesys ^{CODESYS Forge talk (Post)}
Could you send me an example? I would like to generate a data structure using XML files.
Last updated: 2023-09-20

Is it possible to replace a table row header for a text in a text list? ^{CODESYS Forge talk (Thread)}
Is it possible to replace a table row header for a text in a text list?
Last updated: 2021-10-21

Mapping PLC world(code) to Hardware world(remote IO) with some OOP style ^{CODESYS Forge talk (Thread)}
Mapping PLC world(code) to Hardware world(remote IO) with some OOP style
Last updated: 2017-01-19

2D array , data move from a column to another column ^{CODESYS Forge talk (Thread)}
2D array , data move from a column to another column
Last updated: 2011-03-23

PLC (Lenze with CoDeSysy) as MODBUS TCP Slave to connect a 3th party touchscreen ^{CODESYS Forge talk (Thread)}
PLC (Lenze with CoDeSysy) as MODBUS TCP Slave to connect a 3th party touchscreen
Last updated: 2017-01-02

Find Function: Object reference not set to an instance of an object. ^{CODESYS Forge talk (Thread)}
Find Function: Object reference not set to an instance of an object.
Last updated: 2023-10-30

Post by mabac on Unable to load boot application on ARMv7 device restart ^{CODESYS Forge talk (Post)}
You may just need to create a boot application: https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_creating_a_boot_application.html
Last updated: 2023-11-30

Post by jegerjon on Testing of Codesys program ^{CODESYS Forge talk (Post)}
I have a simulation function that toggle xSimActive. I map all IO variables to "IO GVLs" when xSimActive=0. I map IO corresponding SimIO GVL to "IO GVLs" when xSimActive=1. Then I write code for the simulation program that runs when xSimActive=1. Typically increase flow corresponding to pump speed, simulate tankfilling corresponding to flow and so on. I made a FC that require a correct code to activate simulation to avoid unintended activation by service dept. When comissioned remove any possibility to activate simulation. Super when officetesting and supporting service dept. + cheap as it requires no additional equipment, and it is easier to support customer later on in the life cycle as you can test proposed changes without setting up a testlab.
Last updated: 2023-12-07

Post by jegerjon on Testing of Codesys program ^{CODESYS Forge talk (Post)}
I have a simulation function that toggle xSimActive. I map all IO variables to "IO GVLs" when xSimActive=0. I map IO corresponding SimIO GVL to "IO GVLs" when xSimActive=1. Then I write code for the simulation program that runs when xSimActive=1. Typically increase flow corresponding to pump speed, simulate tankfilling corresponding to flow and so on. I made a FC that require a correct code to activate simulation to avoid unintended activation by service dept. When comissioned remove any possibility to activate simulation. Super when officetesting and supporting service dept. + cheap as it requires no additional equipment, and it is easier to support customer later on in the life cycle as you can test proposed changes without setting up a testlab.
Last updated: 2023-12-07

What the right way to update TCP/COM slave device holding registers ^{CODESYS Forge talk (Thread)}
What the right way to update TCP/COM slave device holding registers
Last updated: 2024-07-01

Data Sources Manager causing exception due to float or double type in OPC server ^{CODESYS Forge talk (Thread)}
Data Sources Manager causing exception due to float or double type in OPC server
Last updated: 2024-07-01

Post by ron-rp on Errors with VisuUserManagement library ^{CODESYS Forge talk (Post)}
I dont even need to clean, just compile again and the error disappears hopefullt someone knows what to do with it..
Last updated: 2024-07-14

C0244: No VAR_PERSISTENT list is part of the application to enter instance path for variable ^{CODESYS Forge talk (Thread)}
C0244: No VAR_PERSISTENT list is part of the application to enter instance path for variable
Last updated: 2024-07-17

Global variable access by Programms and Modbus Devices (attach device to bus) ^{CODESYS Forge talk (Thread)}
Global variable access by Programms and Modbus Devices (attach device to bus)
Last updated: 2024-07-18

Post by vladimirsmall on Send data to USB ^{CODESYS Forge talk (Post)}
Hello/ Need send some file ( for example Array of string) to USB. Which library need used for this. Thank you
Last updated: 2024-07-20

RAMP_REAL FB is retaining my output value when i try to re use the FB ^{CODESYS Forge talk (Thread)}
RAMP_REAL FB is retaining my output value when i try to re use the FB
Last updated: 2024-07-29

MultiTouch : Two fingers pinch to Z00M in/out and rotation gesture. ^{CODESYS Forge talk (Thread)}
MultiTouch : Two fingers pinch to Z00M in/out and rotation gesture.
Last updated: 2024-08-02

Connecting to SoftPLC Only Works By Turning Off Modbus Ethernet Port ^{CODESYS Forge talk (Thread)}
Connecting to SoftPLC Only Works By Turning Off Modbus Ethernet Port
Last updated: 2024-08-08

No connection to target: An existing connection was forcibly closed by the remote host ^{CODESYS Forge talk (Thread)}
No connection to target: An existing connection was forcibly closed by the remote host
Last updated: 2024-08-11

Post by bamir on Calculate Time Between Two Events Using RTC ^{CODESYS Forge talk (Post)}
Hi Just wanted to know which library is used to get sys_time
Last updated: 2024-08-14

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