Siemens SIMATIC Operating Instructions Manual page 124

Fail-Safe Electronic Modules
8.3 F -Switch PROFIsafe Digital Electronic Module
Special Features for Fault Detection in Use Case 2.3
The following table presents fault detection according to the sensor supply and the
parameter assignment for the short-circuit test:
Table 8-25
Short circuit of DI 0 with DI 1
Short circuit of DI 0 with DI 2
Short circuit of DI 0 with DI 3
P-short circuit of DI 0
M-short circuit of DI 0
Discrepancy error
P-short circuit of sensor
supply
M-short circuit of sensor
supply or sensor supply
defective
Short-circuit in sensor supply
at DI 0
Supply voltage fault
*: Fault is detected only in case of signal corruption. That is, the signal read differs from the sensor
signal (discrepancy error). If there is no signal corruption relative to the sensor signal, fault detection
is not possible and is not required from a safety standpoint.
124
F-Switch PROFIsafe Electronic Module: Fault Detection (Use Case 2.3)
Example of Fault Fault detection in case of ...
Internal sensor supply Internal sensor supply
and short-circuit test and short-circuit test
enabled
Yes*
Yes
Yes*
Yes*
Yes*
Yes
Yes
Yes
Yes*
Yes
ET 200pro Distributed I/O System - Fail-Safe Modules
disabled
Yes*
Yes
Yes*
Yes*
Yes*
Yes
No
Yes
Yes*
Yes
Operating Instructions, 05/2007, A5E00394073-02
External sensor
supply
Yes*
Yes
Yes*
Yes*
Yes*
Yes
No
Yes
Yes*
Yes