Allen-Bradley LOGIX 5000 Reference Manual page 431

Controllers advanced process control and drives and equipment phase and sequence instructions
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Equipment Phase Instructions
Number
Example 1
Ladder Diagram
Description
If ProcedureB_Stepindex = 20 (the routine is at step 20)
And this is the transition to step 20 (the ONS instruction signals that the EQU instruction went from false to true.)
Then
Change the state of the Add_Water equipment phase to running via the start command.
If ProcedureB_Stepindex = 20 (the routine is at step 20)
And the Add_Water equipment phase is complete (Add_Water.Complete = 1)
Then
Change the state of the Add_Water equipment phase to resetting via the reset command. Advance to step 30.
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Chapter 7
431

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