Siemens SIMATIC S7-1200 - 3.2 Create tags for the I;O of the CPU

Getting started
2.2 Configuring
S7-1200 Functional Safety Manual
40 Manual, 02/2015, A5E03470344-AA
7. In this example, the laser scanner for monitoring the accessible entry area is connected
to channels 1 and 9.
Make the settings as shown in the following figure: