Specify a non-retentive assignment

Specify a non-retentive assignment

The non-retentive assignment is different from the regular assignment described above in that the tag in a non-retentive assignment is reset to zero each time the controller:
  • Enters the Run mode
  • Leaves the step of an SFC if you configure the SFC for Automatic reset. This applies only if you embed the assignment in the action of the step or use the action to call a structured text routine by using a JSR instruction.
A non-retentive assignment has this syntax:
tag [:=] expression ;
where:
Component
Description
tag
Represents the tag that is getting the new value; the tag must be a BOOL, SINT, INT, DINT, STRING, or REAL.
Tip:
 The STRING tag is applicable to
CompactLogix
 5380,
CompactLogix
 5480,
ControlLogix
 5580,
Compact GuardLogix
 5380, and
GuardLogix
 5580 controllers
only.
[:=]
Is the non-retentive assignment symbol.
expression
Represents the new value to assign to the tag.
If tag is this data type
Use this type of expression
BOOL
BOOL
SINT
Numeric
INT
DINT
REAL
STRING
(
CompactLogix
 5380,
CompactLogix
 5480,
ControlLogix
 5580,
Compact GuardLogix
 5380, and
GuardLogix
 5580 controllers
only).
String type, including string tag and string literal
CompactLogix
 5380,
CompactLogix
 5480,
ControlLogix
 5580,
Compact GuardLogix
 5380, and
GuardLogix
 5580 controllers
( only)
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