Siemens SIMATIC Operating Instructions Manual page 115

Conditions for Achieving SIL/Category
The conditions for achieving the respective safety requirements are presented in the
following table.
Table 8-22
Note
You can operate the various inputs of an F-Switch PROFIsafe simultaneously in
SIL3/Category 3 and in SIL3/Category 4. You only have to connect the inputs and assign
parameters as shown in the following sections.
Sensor Requirements
Please note the information in section
sensors for safety-related applications.
See also
Use Case 1: Safety Mode of F-Switch PROFIsafe (Page 116)
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
F-DI Modules: Conditions for Achieving SIL/Category
Use Case Sensors
2.1 1-channel
2.2 2-channel
equivalent
2.3 2-channel
nonequivalent
3.1 2-channel
equivalent
3.2 2-channel
nonequivalent
8.3 F -Switch PROFIsafe Digital Electronic Module
Evaluation of Sensor Supply
the Sensors
1oo2 Internal, with short-
Internal, without short-
1oo2 Internal, without short-
1oo2 Internal, without short-
1oo2 Internal, with short-
"Requirements for Sensors and Actuators"
Fail-Safe Electronic Modules
Achievable
SIL/Category
3 / 3
circuit test
circuit test
External
circuit test
External
circuit test
External
3 / 4
circuit test
when using
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