8.16.4.5 Signal lter for STO selection
Overview
Two lters are available for a failsafe digital input:
• When the discrepancy time is active, the converter tolerates input signals that briey dier.
• When the debounce time is active, the converter suppresses brief signal changes.
Function description
Discrepancy time
The converter checks that the two input signals of the failsafe digital input always have the
same signal state (high or low).
With electromechanical sensors (e.g. emergency stop buttons or door switches), the two
sensor contacts switch, but never at exactly the same time, and are therefore temporarily
inconsistent (discrepancy).
Only a permanent discrepancy signies a fault in the failsafe digital input circuit, e.g. wire
breakage.
You must set the discrepancy time to ignore signals that are briey inconsistent.
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Figure8-28 Discrepancy time
The discrepancy time does not extend the converter response time. The converter activates
the safety functions as soon as one of the two F-DI signals changes its state from high to low.
Advanced commissioning
8.16Safe Torque O (STO) safety function
SINAMICS G120C Converters
262 Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
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