Siemens PM-E F pm DC24V PROFIsafe Installation And Operating Manual page 116

Et 200s distributed i/o system - fail-safe modules
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Fail-Safe Modules
7.5 4/8 F-DI DC24V PROFIsafe Digital Electronic Module
Assignable Parameters for Application 1
Set the "Sensor evaluation" parameter to "1oo1" for the corresponding input.
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 (Application 1)
The following table presents fault detection according to the sensor supply and the
parameter assignment for the short-circuit test:
Table 7- 19
Short circuit in DI 0 with DI 1
Short circuit in DI 0 with DI 4
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 detection only if signals are corrupted. That is, the signal reading differs compared to the
sensor signal. 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 not activated or the sensor supply to digital inputs is set to
"external", the wiring between the sensor and the input channel must be short circuit-proof.
116
EM 4/8 F-DI DC24V PROFIsafe: Fault Detection (Application 1)
Example of Fault
WARNING
internal sensor supply
internal sensor power
and short-circuit test
supply and short-
activated
circuit test are
deactivated
No
Yes*
Yes
Yes*
-
Yes
Yes
Yes
Yes
Yes
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
Fault detection if ...
external sensor
supply
No
No
No
Yes*
-
no
Yes
no
Yes
Yes
No
No
No
No
-
No
Yes
no
Yes
Yes

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