Siemens SINAMICS G120X - Terminals and Switches for the STO Function

Procedure for converters in frame sizes FSA ... FSC
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Both switches = ON: STO is enabled
Both switches = OFF: STO is locked
Two switches different: not permissible
Figure 4-23 Terminals and switches for the "STO" function, frame sizes FSA ... FSC
1. Connect the cables for selecting STO to terminals STO_A and STO_B.
2. Connect the cables for STO feedback to 2 digital outputs of terminal block X134.
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3. Attach the shield to the shield plate of the converter through the largest possible surface
area.
You have connected all cables for the STO safety function.
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Wiring
4.2 Control interfaces
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC 129