Siemens 340 - Page 154

Typical circuits
A.2 Typical circuits for 3RM1 Failsafe
SIRIUS 3RM1 motor starter
154 Manual, 11/2013, A5E0345285095020A/RS-AB/002
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If there is a common reference potential for the two inputs, it suffices to establish a ground
connection.
If there are separate potentials or controls, both connections must be assigned.
Figure A-7 3SK1 safety relay with 3RM13 reversing starter via device connector