Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 439)

5/02 Processor Only
Chapter 31
Understanding I/O Interrupts –
31–9
The RPI instruction is used to purge unwanted I/O interrupt requests. This
instruction is not required to configure a basic I/O interrupt application.
RPI Reset Pending Interrupt – 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).
Parameter: Enter a 0 (reset) in a slot position to indicate that the pending
status of an I/O interrupt is reset (aborted).
Reset Pending Interrupt RPI Output Instruction
(RPI) HHT Ladder Display:
HHT Zoom Display:
F1 F2 F3 F4 F5
ZOOM on RPI –(RPI)– 2.0.0.0.1
NAME: RESET PENDING INTERRUPT
1 2 3
0 0 0 0
0000 0000 0000 0000 0000 0000 0000 0001
EDT_DAT
RPI
RESET PENDING INTERRUPT
Slots:
1–30
Ladder Diagrams and APS Displays:
] [
RUN
MODE FORCE EDT DAT SEARCH
F1 F2 F3 F4 F5
RPI:0000 0000... 2.0.0.0.2
(RPI)
( )
When the cursor is on the RPI instruction, the
slots having reset Pending I/O Interrupt bits are
indicated here by 0s.
HHT Ladder Display:
(online monitor mode)
RPI Instruction