Siemens SIMATIC S7 - Selecting the Digital Output Application; Application 1: Wiring a Directly-Connected SIL-Rated Actuator

Fail-Safe signal module (SM) applications
3.2 Digital output applications
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
75
3.2.1
Selecting the digital output application
Application
Module
Description
1
DC
Directly-connected SIL-rated actuator
2 DC External contactors: Separate P and M controlled contactors
3
DC
External contactors: Parallel connected between P and M
4 DC External contactors: Separate output channels for each contac-
tor
5
Relay
External contactors: Separate circuits of one output channel
6
Relay
Directly-connected SIL-rated actuator
7 Relay Directly-connected SIL-rated actuator, switching both load con-
ductors
3.2.2
Application 1: Wiring a directly-connected SIL-rated actuator