Applications of the F-I/O module
5.3 Examples of application modes for the F-DI 4/F-DQ 2 Fail-Safe module
Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
Equipment Manual, V1.0, 05/2021, A5E51082342-AA
55
5.2.4
Application 4: Wiring external contactors: Separate output channels for
each contactor
The module supports application mode 4, where the module controls the load using the
series-connected, normally-open contacts of two relays. Connect the coils of both relays
across the outputs of two channels. In the safety program, write the same process value (ON
or OFF) to both output channels.
Note
This configuration achieves SIL 3/Cat. 4/PL e if the CPU checks the relay status (feedback)
using a separate digital input and neither channel is configured to disable the dark test.
Figure 5-16 F-DQ application mode 4
5.3
Examples of application modes for the F-DI 4/F-DQ 2 Fail-Safe
module
You can connect field devices to the F-DI 4/F-DQ 2 Fail-Safe module as shown below.
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