→Constant
according to →IEC-standard: language element which declares a data element with a fixed value
In the ST-editor, constant →variables
are declared
by using
the keyword
CONSTANT
. This keyword is only allowed for the sections VAR, VAR_GLOBAL and VAR_EXTERNAL.
In the FBD-editor, constant variables are declared by using the prefix
C
(in particular when creating a value field with a new variable).
This prefix is only allowed for
internal variables, →global variables and →external variables.