Fail-Safe Modules
7.6 EM 4 F-DI/3 F-DO DC24V PROFIsafe digital electronic module
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
153
Wiring Diagram for Nonequivalent Connection of Two Single-Channel Sensors to Two Channels
Two single-channel sensors are connected via two channels to two inputs of the F-module
for each process signal (1oo2 evaluation).
The left-hand channels on the F-module (DI0 through DI3) supply the wanted signals. If no
faults are detected, these signals will be available in the I/O area for inputs on the F-CPU.
The sensors can also be connected to an external sensor supply.
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Figure 7-44 Wiring diagram EM 4 F-DI/3 F-DO DC24V - two 1-channel sensors connected via two
channels, internal sensor supply
WARNING
To achieve SIL3/Category 3/PLd using this wiring, you must use a suitably qualified sensor.
Assignable Parameters for Application 1.3
You can activate or deactivate the "short-circuit test" parameter. For digital inputs connected
to an external supply, set the "Sensor supply" parameter for the corresponding digital input
to "external". The program will otherwise report a "short circuit" diagnostics event if the
"short-circuit test" is activated.
