Iec 61131-3 Second edition 2003-01 Programmable controllers – Part 3: Programming languages

implementation-dependent.
The VAR_CONFIG...END_VAR construction provides a means to assign instance specific locations to
symbolically represented variables, which are nominated for the respective purpose by using the
asterisk notation described in 2.4.1.1 and 2.4.3.1, respectively, or to assign instance specific initial
values to symbolically represented variables, or both.
The assignment shall be accomplished by qualifying the name of the object to be located or initialized
with the complete hierarchical concatenation of instance names, beginning with the name of the
resource (if any), followed by the name of the program instance, followed by the name(s) of the
function block instance(s) (if any). The name of the object to be located or initialized is concatenated
at the end of the chain. All names in the concatenation shall be separated by dots. The location
assignment or the initial value assignment follows the syntax and the semantics described in 2.4.3.1
and 2.4.3.2 respectively.
Instance specific initial values provided by the VAR_CONFIG...END_VAR construction always
override type specific initial values. It shall not be possible to define instance specific initializations to
variables which are declared in VAR_TEMP, VAR_EXTERNAL, VAR CONSTANT or VAR_IN_OUT
declarations.
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61131-3 
 IEC:2003(E)
Table 49 - Configuration and resource declaration features
No.
Description
1
CONFIGURATION...END_CONFIGURATION construction
2
VAR_GLOBAL...END_VAR construction within CONFIGURATION
3
RESOURCE...ON...END_RESOURCE construction