Wiring the Inputs and Outputs
7-14 Operating Manual: PSS 3075-3 Series
Alarm inputs (DIF)
Features:
• Alarm inputs for max. 6 process interrupts
• Alarm processing is triggered by a pulse edge change at an input.
• The inputs that trigger an alarm and the pulse edge that causes the
alarm to be triggered are defined via the configurator in the programming
device (see Programming Manual).
• Only those alarms triggered by a signal change from “1” to “0” are safety-
related.
• The input signals may require screened cables, depending on the signal
frequency and the ambient conditions.
• Alarms which are safety-related must undergo a functionality test. The
inputs may be tested using test pulses or via the feasibility check (see
example, “Alarm test”).
• If cable runs exceed 50 m, a resistance of 1 kOhm must be connected in
parallel with the input. Maximum cable runs will then be 400 m.
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