Siemens 4 F-DI/3 F-DO DC24V PROFIsafe

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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

154 Installation and Operating Manual, 08/2008, A5E00103686-07

Special Features of Fault Detection in Application 1.3

The following table presents fault detection according to the sensor supply and the

parameter assignment for the short-circuit test:

Table 7- 31 EM 4 F-DI/3 F-DO DC24V PROFIsafe: Fault Detection (Application 1.3)

Fault detection if ... Example of fault

Internal sensor supply

and short-circuit test

are activated

Internal sensor supply

and short-circuit test

are deactivated

external sensor

supply

Short-circuit DI0 with DI1 Yes* Yes* Yes*

Short-circuit DI0 with DI4 Yes Yes Yes

Short-circuit DI0 with DI5 Yes* Yes* Yes*

P short-circuit DI0 Yes* Yes* Yes*

M short-circuit DI0 Yes* Yes* Yes*

Discrepancy error Yes Yes Yes

P-short circuit in sensor

supply

Yes No No

M-short circuit in sensor

supply or sensor supply

defective

Yes Yes Yes

Short-circuit SS with DI0 Yes* Yes* Yes*

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.

Siemens 4 F-DI/3 F-DO DC24V PROFIsafe - Page 154