Siemens SIMATIC PCS 7 Operating Manual page 60

Configuring S7F/FH hardware
6.4 Setting system parameters for F-signal modules
Sensor evaluation (analog inputs)
● 1oo2 evaluation
1 sensor connected to the module via a single-channel redundant connection (voting on
module). The module has 6 redundant SIL 3-compatible channels.
Safety class SIL3 can be achieved here:
Type of sensor interconnection (analog inputs)
When safety mode is activated 1 or 2 sensors can be configured per input channel.
Discrepancy handling can be set accordingly.
Interference frequency suppression
Setting interference frequency suppression for the line frequency The corresponding
integration time of the analog digital converter is displayed.
If you change this setting, the increment for the F monitoring time and for the discrepancy
times will also change automatically. The values set there will be adjusted to the next lowest
value.
F wire-break detection
You can set whether a wire-break check is to be performed for each individual channel
(< 3.6 mA; otherwise, detected at 1.18 mA underflow).
If wire break is detected, a diagnostics interrupt will be triggered in the CPU and a
corresponding process control message will be sent on the OS.
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Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB