Siemens 340 Manual page 154

Typical circuits
A.2 Typical circuits for 3RM1 Failsafe
* 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
154
3SK1 safety relay with 3RM13 reversing starter via device connector
SIRIUS 3RM1 motor starter
Manual, 11/2013, A5E0345285095020A/RS-AB/002