Fail-Safe signal module (SM) applications
3.2 Digital output applications
S7-1200 Functional Safety Manual
76 Manual, 02/2015, A5E03470344-AA
Application 2: Wiring external contactors: Separate P and M controlled
contactors
A short-circuit between the P and the M output can immediately lead to dangerous failure.
You must prevent this failure mode by proper separation and protection of conductors.
Application 3: Wiring external contactors: Parallel connected between P and M
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