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7.5.7
Application 2: Safety mode SIL3/Category 3/PLe
Assigning Inputs to Each Other
The EM 4/8 F-DI DC24V PROFIsafe has 8 fail-safe inputs, DI 0 through DI 7 (SIL2). A pair of
these inputs can each be used as one input (SIL3). The following assignment applies:
● DI 0 with DI 4
● DI 1 with DI 5
● DI 2 with DI 6
● DI 3 with DI 7
Sensor supply
The EM 4/8 F-DI DC24V PROFIsafe provides sensor supply Vs1 for Inputs 0 to 3 and sensor
supply Vs2 for Inputs 4 to 7. The sensors can be powered internally or externally.
Wiring Diagram for Application 2.1 - Connecting one channel of one sensor to two inputs
Single-channel connection of a sensor to two inputs of the F-module for each process signal
(1oo2 evaluation).
Note
If you power the sensors from the F-DI module, you must use the internal sensor supply Vs1.
Connection to Vs2 is not possible.
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
7.5 4/8 F-DI DC24V PROFIsafe Digital Electronic Module
Fail-Safe Modules
117
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