Allen-Bradley LOGIX 5000 Reference Manual page 459

Equipment Phase Instructions
Major/Minor Faults
A major fault occurs if:
Instruction is called from outside an Equipment Phase
program.
If an Add-On Instruction uses a PPD instruction, and a non-equipment phase
program calls the Add-On Instruction, Logix Designer gives a warning. Check the
Add-On Instruction for this instruction to disallow it. See Index Through Arrays
for operand-related faults.
Execution
Condition/State
Prescan
Postscan
EnableIn is false
EnableIn is true
Example
Ladder Diagram
See also
Equipment Phase Instructions
Index Through Arrays
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Fault type
4
Action Taken
No action taken.
No action taken.
No action taken.
The instruction executes.
on page 415
on page 551
Chapter 7
Fault code
91
459