Program a Function Block Diagram
14 Rockwell Automation Publication 1756-PM009G-EN-P - February 2018
changes 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.
To Next Page
Loading...
Need help?
General
