Siemens SIMATIC S7 System Manual page 332

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Program instructions

7.10 Interrupt

Example 1: Input signal edge detector interrupt

On the first scan:

1. Define interrupt routine

INT_0 to be a falling-edge

interrupt for I0.0.

2. Globally enable interrupts.

If an I/O error is detected, disa-

ble the falling-edge interrupt for

(This network is optional.)

When M5.0 is on, disable all

interrupts. When disabled,

attached interrupt events will be

queued, but the corresponding

interrupt routines will not be

executed until interrupts are re-

enabled with the ENI instruc-

I0.0 falling-edge interrupt rou-

tine: Conditional return based

on an I/O error.

System Manual, V2.3, 07/2017, A5E03822230-AF

ATCH INT_0, 1

S7-200 SMART

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Simatic s7-200 smart