Siemens SIMATIC ET 200SP Manuel - Page 23

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Siemens SIMATIC ET 200SP Manuel
Interrupts/diagnostics alarms

5.2 Interrupts

5.2
Interrupts
Digital input module DI 8×NAMUR HF supports the following diagnostics and hardware
interrupts.
Diagnostics interrupt
The module generates a diagnostics interrupt at the following events:
● Short-circuit to ground
● Wire break
● Supply voltage missing
● Changeover error
● Chatter error
Evaluating hardware interrupts with IO controller
The module generates a hardware interrupt at the following events:
● Upon a rising edge (signal change from 0 to 1)
● Upon a falling edge (signal change from 1 to 0)
In the event of an interrupt, interrupt OBs run automatically in the CPU of the IO controller.
You will find detailed information on the event in the hardware interrupt organization block
with the "RALRM" instruction (read additional interrupt info) and in the STEP 7 online help.
The module channel that triggered the hardware interrupt is entered in the start information
of the organization block. The following figure shows the assignment to the bits of double
word 8 in local data.
Figure 5-2
22
Organization block start information
DI 8xNAMUR HF digital input module (6ES7131-6TF00-0CA0)
Manual, 02/2014, A5E03894478-01