User guide

Interrupts – 5/02 Processor Only
Chapter 30
Understanding Selectable Timed
30–9
The Interrupt Subroutine (INT) instruction is used in selectable timed
interrupt subroutines and I/O event–driven interrupt subroutines to
distinguish the subroutine as an interrupt subroutine versus a regular
subroutine. Use of the instruction is optional.
Interrupt Subroutine INT
INT
F1 F2 F3 F4 F5
ZOOM on INT –|INT|– 2.3.0.0.1
NAME: I/O INTERRUPT
EDT_DAT
HHT Ladder Display:
HHT Zoom Display:
Ladder Diagrams and APS Displays:
(online monitor mode)
INT
INTERRUPT SUBROUTINE
Interrupt Subroutine – 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 interrupt subroutine.
INT Instruction