Interrupts - Siemens SIMATIC ET 200SP Manual

Interrupts/diagnostics alarms

5.2 Interrupts

5.2 Interrupts
The digital input module DI 8×24VDC HF supports hardware and diagnostics alarms.
Diagnostics interrupts
The module generates a diagnostic interrupt at the following events:
● Short-circuit
● Wire break
● Parameter assignment error
● Supply voltage missing
● Hardware interrupt lost
● Channel temporarily unavailable
Evaluating hardware interrupts with IO controller
The module generates a hardware interrupt at the following events:
● At positive edge (signal change from 0 to 1)
● At negative edge (signal change from 1 to 0)
In the event of an interrupt, interrupt OBs are automatically executed in the CPU of the
IO controller.
You can obtain detailed information on the event in the hardware interrupt organization block
with the "RALARM" (read additional interrupt information) instruction and in the STEP 7
online help.
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Digital input module DI 8x24VDC HF (6ES7131-6BF00-0CA0)
Manual, 12/2017, A5E03576305-AE