Chapter 1 Program a Function Block Diagram
14 Rockwell Automation Publication 1756-PM009J-EN-P - March 2022
during execution of the routine, the stored value of tagA in the IREF does not
change until the next execution of the routine.
This example is the same as the previous example. The value of tagA is stored
only once at the beginning of the execution of the routine. The routine uses
this stored value throughout the routine.
With version 11 and later of the application, use the same tag in multiple
IREFs and an OREF in the same routine. Because the values of tags in IREFs
are latched every scan through the routine, all IREFs use the same value, even
if an OREF obtains a different tag value during execution of the routine. In
this example, if tagA has a value of 25.4 when the routine starts executing this
scan, and Block_01 changes the value of tagA to 50.9, the second IREF wired
into Block_02 still uses a value of 25.4 when Block_02 executes this scan.
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