Editing remanent global variables lists

If they are supported by the runtime system, remanent variables may be processed. There are two types of remanent global variables:

Retain variables remain unchanged after an uncontrolled shutdown of the runtime system (off/on) or an 'Online' 'Reset'⮫ “'Online' 'Reset'”.
Persistent variables remain only unchanged after a program download⮫ “'Online' 'Download'”.

Persistent variables are not automatically also Retain variables !

Remanent variables are additionally assigned the keyword RETAIN and/or PERSISTENT.

Syntax:

VAR_GLOBAL RETAIN
 (* Variables declarations *)
END_VAR
VAR_GLOBAL PERSISTENT 
 (* Variables declarations *)
END_VAR

For the combination of retain and persistent properties both keywords are used:

 VAR_GLOBAL RETAIN PERSISTENT

 VAR_GLOBAL PERSISTENT RETAIN