Siemens SIMATIC ET 200AL System Manual page 962

Applications of the F-I/O module
5.3 Examples of application modes for the F-DI 4/F-DQ 2 Fail-Safe module
Laser scanner (1oo2 evaluation)
For the output signal switching device (OSSD) sensors of a Laser Scanner, use F-DI application
mode 4 to connect the Laser Scanner output signal switching device with 1oo2 evaluation to
the F-DI 4/F-DQ 2 Fail-Safe module:
Alternatively, use F-DI application mode 3 and disable the parameter "Short-circuit test" for
both sensor supplies.
ESTOP (Emergency Stop) (1oo2 evaluation)
For the ESTOP, use F-DI application mode 3 to connect an ESTOP device with 1oo2 evaluation
to the F-DI 4/F-DQ 2 Fail-Safe module:
Alternatively, use F-DI application modes 5 or 7 if nonequivalent evaluation is required for
your ESTOP device.
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Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
Equipment Manual, V1.0, 05/2021, A5E51082342-AA