Siemens SIMATIC ET 200AL System Manual page 956

Applications of the F-I/O module
5.1 Digital input applications
Figure 5-11 F-DI application mode 7: Internal sensor supply (1oo2 evaluation of two single-channel sensors with
nonequivalent outputs shown)
Parameter assignment
Parameter name
Sensor evaluation
Sensor supply
Short-circuit test
F-DI application mode 8
This application mode uses two single-channel sensors or a two-channel sensor with two
nonequivalent outputs in a 1oo2 voting with discrepancy evaluation. When you use an
external sensor supply, the module does not evaluate that channel for short-circuit testing.
The application mode uses the following pins:
• Pin 2 (channels 2 and 3) is the inverted input of the nonequivalent configuration
• Pin 4 (channels 0 and 1) is the non-inverted input of the nonequivalent configuration
Note
To incorporate F-DI application mode 8 into a SIL 3-rated application, ensure the sensors are
appropriately qualified devices.
50
1oo2 evaluation, 2 channel - 4 wire nonequivalent
Internal
Enable
Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
Equipment Manual, V1.0, 05/2021, A5E51082342-AA
Parameter value