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
148
Installation and Operating Manual, 08/2008, A5E00103686-07
Fault detection if ...
Short-circuit DI0 with DI5
No
No
No
P short-circuit DI0
Yes
No
No
M short-circuit DI0
Yes*
Yes*
No
Discrepancy error
Yes
Yes
Yes
P-short circuit in sensor
supply
Yes
No
No
M-short-circuit in sensor
supply or defective
Yes
Yes
Yes
Short-circuit SS with DI0
No
No
No
Supply voltage fault
Yes
Yes
Yes
*: Fault is detected only in case of signal corruption. In other words, the signal read differs from the
sensor signal (discrepancy error). If there is no signal corruption with respect to the sensor signal,
fault detection is not possible and is not required from a safety standpoint.
WARNING
If the short-circuit test is disabled or cannot be enabled, the wiring between the sensor and
input channel must be short circuit-proof.
