252 Rockwell Automation Publication 2080-UM002L-EN-E - November 2021
Appendix D User Interrupts
User Fault Routine
The user fault routine gives you the option of doing the cleanup before a
controller shutdown, when a specific user fault occurs. The fault routine is
executed when any user fault occurs. The fault routine is not executed for non-
user faults.
The controller goes to Fault mode after a User Fault Routine is executed, and
the User Program execution stops.
Creating a User Fault Subroutine
To use the user fault subroutine:
1. Create a POU.
2. In the User Interrupt Configuration window, configure this POU as a
User Fault routine.
User Interrupt Instructions
Instruction Used To: Page
STIS – Selectable Timed
Start
Use the STIS (Selectable Timed Interrupt Start) instruction to the
start the STI timer from the control program, rather than
starting automatically.
253
UID – User Interrupt
Disable
Use the User Interrupt Disable (UID) and the User Interrupt
Enable (UIE) instructions to create zones in which user
interrupts cannot occur.
253
UIE – User Interrupt
Enable
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UIF – User Interrupt
Flush
Use the UIF instruction to remove selected pending interrupts
from the system.
255
UIC – User Interrupt
Clear
Use this function to clear Interrupt Lost bit for the selected User
Interrupt(s).
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