Siemens SIMATIC S7 Functional Safety Manual page 50

Getting started
2.3 Programming
Specifying inputs and outputs for the safety program
After configuring the hardware as described in Steps 1 to 4, the following fail-safe CPU and
SM DBs are available for programming the example:
Configured hardware
Fail-safe CPU standard digital inputs CPU
1214FC
Fail-safe digital input module SM 1226 F-DI
16 x 24 VDC
Fail-safe digital output module SM 1226 F-
DQ 4 x 24 VDC
Assign the following symbolic names for the fail-safe inputs and outputs:
50
Start input Symbolic name
address
IB0 PLC_1 [CPU 1214FC DC/DC/DC]
IB8 F00008_SM 1226 F-DI 16 x 24 VDC
IB16 F00016_SM 1226 F-DQ 4 x 24 VDC
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA