"Invalid Value" for Variables at Runtime ^{CODESYS Forge talk (Thread)}
"Invalid Value" for Variables at Runtime
Last updated: 2026-03-09

Post by jeffyech on <Dereference of invalid pointer> ^{CODESYS Forge talk (Post)}
I have a program which calls a structure. while online with the PLC, I get: <dereference of="" invalid="" pointer=""> in the declaration values area. What are the causes of this? Can it be solved?</dereference> Version 3.5 of codesys.
Last updated: 2026-06-25

Post by kislov on Table How to set row number from 1 ( not from 0) ^{CODESYS Forge talk (Post)}
Use declaration with ARRRAY [1..x] instead of ARRAY [0..x]
Last updated: 2024-05-27

Post by tvm on Generic Variables and FDB ^{CODESYS Forge talk (Post)}
I also ran into this, try using Coil<1> as the type in the FBD box. From what I understand, with VAR_GENERIC CONSTANT, the compiler creates separate data types for each different function block declaration.
Last updated: 2026-07-22

Post by eschwellinger on Persistent variables are not read after initialization ^{CODESYS Forge talk (Post)}
which version of the runtime do you use?
Last updated: 2024-09-02

Post by mariacugnier on Modbus TCP/IP having problems with global variables ^{CODESYS Forge talk (Post)}
Are these variables already declared in the IO list? It looks like it's trying to create new variables instead of mapping them to the existing ones.
Last updated: 2025-05-22

Post by tk096 on Axis_Ref_SM3.perfTimers ^{CODESYS Forge talk (Post)}
Hi, these variables are internal members of the axis. They measure the duration of some internal function calls.
Last updated: 2023-11-23

Post by damian177 on Persistence variables PFC200 ^{CODESYS Forge talk (Post)}
Hi, I using persistence variables like below: VAR_GLOBAL PERSISTENT RETAIN id_worker1: ARRAY [0..3] OF INT := [231,234,176,222]; id_worker2: ARRAY [0..3] OF INT := [211,129,125,221]; Initial values can cause some problems?
Last updated: 2023-12-08

Variables $placeholders$ in visualisations, like in v.2.x ? ^{CODESYS Forge talk (Thread)}
Variables $placeholders$ in visualisations, like in v.2.x ?
Last updated: 2021-05-06

how to make var constant variables globally available ^{CODESYS Forge talk (Thread)}
how to make var constant variables globally available
Last updated: 2019-12-10

Modbus Communication with Wago PLC's about persistent variables ^{CODESYS Forge talk (Thread)}
Modbus Communication with Wago PLC's about persistent variables
Last updated: 2023-07-29

Defining local variables that can be independent with several users. ^{CODESYS Forge talk (Thread)}
Defining local variables that can be independent with several users.
Last updated: 2023-10-21

Persistent variables not working for Control Win ^{CODESYS Forge talk (Thread)}
Persistent variables not working for Control Win
Last updated: 2024-09-10

Persistent variables are not read after initialization ^{CODESYS Forge talk (Thread)}
Persistent variables are not read after initialization
Last updated: 2024-10-20

Multiple applications on one device sharing variables. ^{CODESYS Forge talk (Thread)}
Multiple applications on one device sharing variables.
Last updated: 2025-03-06

Retain / Persistent Variables in Codesys for Raspberry Pi ^{CODESYS Forge talk (Thread)}
Retain / Persistent Variables in Codesys for Raspberry Pi
Last updated: 2025-05-19

Modbus TCP/IP having problems with global variables ^{CODESYS Forge talk (Thread)}
Modbus TCP/IP having problems with global variables
Last updated: 2025-05-21

Modbus TCP/IP having problems with global variables ^{CODESYS Forge talk (Thread)}
Modbus TCP/IP having problems with global variables
Last updated: 2025-05-22

Latch alarm variables from the PLC runtime ^{CODESYS Forge talk (Thread)}
Latch alarm variables from the PLC runtime
Last updated: 2025-09-23

Persistent variables from old Codesys V2 project.. ^{CODESYS Forge talk (Thread)}
Persistent variables from old Codesys V2 project..
Last updated: 2019-03-21

Acessing SoftPLC variables in user space by internal program ^{CODESYS Forge talk (Thread)}
Acessing SoftPLC variables in user space by internal program
Last updated: 2019-02-28

read datafile and update variables with the data values ^{CODESYS Forge talk (Thread)}
read datafile and update variables with the data values
Last updated: 2017-07-07

Using the same variables for recipes and communication ^{CODESYS Forge talk (Thread)}
Using the same variables for recipes and communication
Last updated: 2015-08-25

Using ENUM type variables in a recipe ^{CODESYS Forge talk (Thread)}
Using ENUM type variables in a recipe
Last updated: 2015-09-16

Export Network variables as ITF file ^{CODESYS Forge talk (Thread)}
Export Network variables as ITF file
Last updated: 2013-01-07

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