Installation manual

Publication 1747-RM001G-EN-P - November 2008
11-34 Understanding Interrupt Routines
Reset Pending Interrupt
(RPI)
This instruction resets the pending status of the specified slots and informs the
corresponding I/O modules that you have aborted their interrupt requests.
This instruction is not required to configure a basic I/O interrupt application.
When true, this instruction clears the I/O pending bits (S:25/1 through
S:26/14) corresponding to the slots parameter of the instruction. In addition,
the processor notifies the specialty I/O modules in those slots that their
interrupt request was aborted. Following this notice, the slot may once again
request interrupt service. This instruction does not affect the I/O slot interrupt
enable bits (S:27/1 through S:28/14).
Entering Parameters
Enter the I/O slot numbers (1 to 30) involved.
Interrupt Subroutine (INT)
Use the INT instruction in I/O event-driven interrupt subroutines (ISRs) and
STIs for identification purposes. Use of this instruction is optional.
This instruction has no control bits and is always evaluated as true. When used,
the INT should be programmed as the first instruction of the first rung of the
ISR.
RPI
Reset Pending Interrupt
Slots 0
RPI
Fixed SLC
5/01
SLC
5/02
SLC
5/03
SLC
5/04
SLC
5/05
••••
Table 11.5 I/O Slot Numbers
Slot # Slot Indicated
6 indicates slot 6
6,8 indicates slots 6 and 8
6 to 8 indicates slots 6, 7, and 8
1 to 30 indicates all slots
Fixed SLC
5/01
SLC
5/02
SLC
5/03
SLC
5/04
SLC
5/05
••••