Siemens SIMATIC S7 - Applications 5 and 6: 1 Oo2 Evaluation of Independent Equivalent Sensors

Fail-Safe signal module (SM) applications
3.1 Digital input applications
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
71
3.1.4
Applications 5 and 6: 1oo2 evaluation of independent equivalent sensors
S0 and S8 can be dual contacts of a single sensor.
Figure 3-5 F-DI Application mode 5: Internal sensor supply
Figure 3-6 F-DI Application mode 6: External sensor supply