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
147
30(
)',)'2
/ 0
/ 0
96
',
6
6
6
6
',
',
',
',
',
',
',
Figure 7-38 Wiring diagram EM 4 F-DI/3 F-DO DC24V - one sensor connected via one channel to
two inputs, external sensor supply
WARNING
To achieve SIL2/Category 3/PLd using this wiring, you must use a suitably qualified sensor.
Assignable Parameters for Application 1.1
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.
Special Features of Fault Detection in Application 1.1
The following table presents fault detection according to the sensor supply and the
parameter assignment for the short-circuit test:
Table 7- 29 EM 4 F-DI/3 F-DO DC24V PROFIsafe: Fault detection
Fault detection if ...
Example of fault
internal sensor supply
and short-circuit test
activated
internal sensor power
supply and short-
circuit test are
deactivated
external sensor
supply
Short-circuit DI0 with DI1
No
No
No
