Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 431)

A–B
31 Chapter
31–1
Understanding I/O Interrupts – SLC 5/02
Processor Only
This chapter applies to the SLC 5/02 processor only. It covers the following
topics:
•
I/O interrupt operation
•
I/O interrupt parameters
•
IID and IIE instructions
•
RPI instruction
•
INT instruction
The I/O event-driven interrupt function can be used with the SLC 5/02
processor only. This function allows a specialty I/O module to interrupt the
normal processor operating cycle in order to scan a specified subroutine file.
Interrupt operation for a specific module is described in the user’s manual for
the module.
I/O event-driven interrupts cannot be accomplished using standard discrete
I/O modules.
Basic Programming Procedure for the I/O Interrupt Function
•
Specialty I/O modules which create interrupts should be configured in the
lowest numbered I/O slots. When you are configuring the specialty I/O
module slot with the HHT, select the ADV_SET and INT_SBR function
keys and program the “ISR” (interrupt subroutine) program file number
(range 3–255) that you want the I/O module to execute.
Configuring I/O is discussed in chapter 6.
•
Create the subroutine file that you have specified in the I/O module slot
configuration.
Creating a subroutine file is discussed in chapter 4.
I/O Overview