Fail-Safe signal module (SM) applications
3.2 Digital output applications
S7-1200 Functional Safety Manual
78 Manual, 02/2015, A5E03470344-AA
Application 6: Wiring a directly-connected SIL-rated actuator
A short-circuit from 1L to A or equivalent fault can lead immediately to a dangerous failure.
You must prevent this failure mode by proper separationand protection of conductors.
Application 7: Wiring a directly-connected SIL-rated actuator, switching both
load conductors
By switching both conductors to the load, this arrangement provides extra protection for
faults to power or ground in the external wiring that might energize the load device.
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