Setting The Filter For Safety Inputs - Siemens SINAMICS G120 Function Manual

Commissioning
5.6 Setting basic functions
5.6.3

Setting the filter for safety inputs

You must set the input filter and the simultaneity monitoring of the safety input for all
SINAMICS inverters where the safety F-DI input evaluates two redundant signals.
For SIMATIC ET 200pro FC, the input signal for STO is received from the F0 rail of the
backplane bus of the ET-200pro system. As a consequence, the simultaneity monitoring is
not applicable for this converter.
Procedure
To set the input filter and simultaneity monitoring of the safety-related input, proceed as
follows:
1. Select the advanced settings for STO.
2. Set the debounce time for the F-DI input filter.
3. Set the discrepancy for the simultaneity monitoring.
4. Close the screen form.
You have set the input filter and the simultaneity monitoring of the safety-related input.
Description of the signal filter
The following are available for the signal processing of the safety-related inputs:
● A tolerance for the simultaneous monitoring.
● A filter to suppress short signals, e.g. test pulses.
A tolerance for the simultaneous monitoring
The inverter checks whether the signals at both inputs always have the same signal status
(high or low).
With electromechanical sensors (e.g. emergency stop buttons or door switches), the two
sensor contacts never switch at exactly the same time and are therefore temporarily
inconsistent (discrepancy). A long-term discrepancy indicates a fault in the wiring of a safety-
related input, e.g. a wire break.
When appropriately set, the inverter tolerates brief discrepancies.
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Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA