Siemens PM-E F pm DC24V PROFIsafe Installation And Operating Manual page 129

Special Features of Fault Detection (Application 3.1 and 3.2)
The following table presents fault detection according to the sensor supply and the
parameter assignment for the short-circuit test:
Table 7- 23
Short circuit in DI 0 with DI 1
Short circuit in DI 0 with DI 4
Short circuit in DI 0 with DI 5
P-short circuit in DI 0
M-short circuit in DI 0
Discrepancy error
P-short circuit in sensor supply 1
M-short circuit in sensor supply 1, or
sensor supply 2 defective
Short circuit in sensor supply 1 with
sensor supply 2
Fault in read/test circuit
Supply voltage fault
*: 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.
Requirements for Machine Protection Applications with Category 4
The following requirements apply for applications in machine protection with category 4:
● The wiring between sensors and automation system and between automation system
● All short circuits listed in the above table are covered. It is sufficient to locate a short
Procedures for locating all short circuits are also permissible if single short circuits are not
located,
● provided these do not cause corruption of read signals compared to the sensor signals or
● provided they cause corruption of read signals compared to sensor signals in the
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
EM 4/8 F-DI DC24V PROFIsafe: Fault Detection (Application 3.1 and 3.2)
Example of fault
and actuators must be designed to state-of-the-art engineering and standards to prevent
short circuits
circuit, because two faults are required for it to occur (both signal lines in short circuit
have an insulation fault). A multiple short circuit analysis is not required.
direction that ensures safety.
7.5 4/8 F-DI DC24V PROFIsafe Digital Electronic Module
Fault detection with internal sensor power supply and
activated short-circuit test for...
Sensor 2-channel equivalent
Yes*
Yes*
Yes*
Yes
Yes*
Yes
Yes
Yes
Yes
Yes
Yes
Fail-Safe Modules
Sensor 2-channel non-
equivalent
Yes*
Yes
Yes*
Yes
Yes*
Yes
Yes
Yes
Yes
Yes
Yes
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