Siemens PM-E F pm DC24V PROFIsafe Installation And Operating Manual page 119

To achieve SIL3/Category 3/PLe using this wiring, you must use a suitably qualified sensor.
Assignable Parameters for Application 2.1
Set the "1oo2 evaluation" at the corresponding input, and "Single-channel" at the "Type of
sensor interconnection" parameter. The default discrepancy time of 10 ms cannot be
modified.
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.
Specific Features of Fault Detection (Application 2.1)
The following table presents fault detection according to the sensor supply and the
parameter assignment for the short-circuit test:
Table 7- 20
Short circuit in DI 0 with DI 1
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.
If the short-circuit test is disabled or cannot be enabled, the wiring between the sensor and
input channel must be short circuit-proof.
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
WARNING
EM 4/8 F-DI DC24V PROFIsafe: Fault detection (application 2.1)
Example of fault
WARNING
7.5 4/8 F-DI DC24V PROFIsafe Digital Electronic Module
Internal sensor supply Internal sensor supply
and short-circuit test and short-circuit test
are activated
no
no
Yes
Yes*
Yes
Yes
Yes
Yes
Yes
Yes
Fault detection if ...
are deactivated
no
no
no
Yes*
Yes
no
Yes
no
Yes
Yes
Fail-Safe Modules
External sensor
supply
no
no
no
no
Yes
no
Yes
no
Yes
Yes
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