Applications of the F-I/O module
5.1 Digital input applications
Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
Equipment Manual, V1.0, 05/2021, A5E51082342-AA
49
5.1.4
Applications 7 and 8: 1oo2 evaluation of a 4-wire, nonequivalent sensor
circuit
F-DI application mode 7
This application mode uses a two-channel sensor or two single-channel sensors in
nonequivalent configuration (4-wire connection) in a 1oo2 voting with discrepancy
evaluation. When you use an internal sensor supply, you can successfully perform short-
circuit detection. 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 7 into a SIL 3-rated application, ensure the sensors are
appropriately qualified devices.
Figure 5-10 F-DI application mode 7: Internal sensor supply (1oo2 evaluation of two-channel sensor with nonequivalent
outputs shown)
Use Y cable (6ES7194-6KB00-0XA0) for application mode 7 as follows:
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