Siemens SIMATIC Operating Instructions

Fail-Safe Electronic Modules
8.3 F -Switch PROFIsafe Digital Electronic Module
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
121
Special Features for Fault Detection in Use Case 2.2
The following table presents fault detection according to the sensor supply and the
parameter assignment for the short-circuit test:
Table 8-24 F-Switch PROFIsafe Electronic Module: Fault Detection
Fault detection in case of ... Example of Fault
Internal sensor supply
and short-circuit test
enabled
Internal sensor supply
and short-circuit test
disabled
External sensor
supply
Short circuit of DI 0 with DI 1 Yes* Yes* Yes*
Short circuit of DI 0 with DI 2 No No No
Short circuit of DI 0 with DI 3 Yes* Yes* Yes*
P-short circuit of DI 0 Yes* Yes* Yes*
M-short circuit of DI 0 Yes* Yes* Yes*
Discrepancy error Yes Yes Yes
P-short circuit of sensor
supply
Yes No No
M-short-circuit in sensor
supply or defective
Yes Yes Yes
Short-circuit in sensor supply
at DI 0
Yes* Yes* Yes*
Supply voltage fault Yes Yes Yes
*: 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.
WARNING
If the short-circuit test is not enabled 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.

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)