→Internal variable
An internal variable is a →variable which cannot be used outside of the POU by default.
Related to the ST-syntax, the variables of the section VAR ... END_VAR are usually identified as internal variables. In FBD/LD, these variables are rather identified as
→local variables
.
In fact, internal variables are:
Variables from the section |
Information on the ST-syntax provided under |
VAR ... END_VAR |
|
VAR_TEMP ... END_VAR |
However due to the rule Assignments from/to local variables of a function block are not allowed outside of function blocks, the variables from section VAR ... END_VAR can be used outside, if these variables have been declared within a →function block .