Siemens SIMATIC S7 Functional Safety Manual page 39

6. In this example, a two-channel emergency stop switch (emergency stop) is connected to
channels 0 and 8.
In our example, these channels are wired to Process value bits I8.0 and I9.0. The first of
the two inputs, I8.0, conveys the signal in this 1oo2 configuration. Expand "DI
parameters" and "Channel parameters" and select "Channel 0, 8".
Enter the settings as shown in the following figure:
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
Getting started
2.2 Configuring
39