Applications of the F-I/O module
5.2 Digital output applications
Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
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Equipment Manual, V1.0, 05/2021, A5E51082342-AA
Figure 5-14 F-DQ application mode 2
5.2.3
Application 3: Wiring external contactors: Parallel-connected contactors
between P and M
The module supports application mode 3, where the module controls the load using the
series-connected, normally-open contacts of two relays. You connect the coils of both relays,
in parallel, across the outputs of one channel.
Note
This configuration achieves SIL 3/Cat. 4/PL e if the CPU checks the relay status (feedback)
using a separate digital input and if neither channel is configured to disable the dark test.
Application mode 3 is the preferred way of controlling an actuator using relays in a safety-
related application. Application mode 3 avoids the problems mentioned for Application mode
2, regarding short-circuits of the P and M outputs.
Figure 5-15 F-DQ application mode 3
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