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)
46
Equipment Manual, V1.0, 05/2021, A5E51082342-AA
Figure 5-6
F-DI application mode 4: External sensor supply (1oo2 evaluation of two-channel sensor shown)
Parameter assignment
Parameter name
Parameter value
Sensor evaluation
1oo2 evaluation, 2 channel equivalent
Sensor supply
External
5.1.3
Applications 5 and 6: 1oo2 evaluation of a 3-wire, nonequivalent sensor
circuit
F-DI application mode 5
This application mode uses a two-channel sensor or two single-channel sensors with two
nonequivalent outputs 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 5 into a SIL 3-rated application, ensure the sensors are
appropriately qualified devices.
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