Siemens SIMATIC Operating Instructions Manual page 64

Fail-Safe Electronic Modules
8.1 8 /16 F-DI DC24V PROFIsafe Digital Electronic Module
Conditions for Achieving SIL/Category
The conditions for achieving the respective safety requirements are presented in the
following table.
Table 8-3
Note
You can operate the various inputs of an F-DI module simultaneously in SIL2/Category 3
and SIL3/Category 3 or 4. You only have to connect the inputs and assign parameters as
shown in the following sections.
Sensor Requirements
Please note the information in
sensors for safety-related applications.
See also
Use Case 1: Safety Mode SIL2/Category 3 (Page 65)
Use Case 2: Safety Mode SIL3/Category 3 (Page 67)
Use Case 3: Safety Mode SIL3/Category 4 (Page 77)
64
F-DI Modules: Conditions for Achieving SIL/Category
Use case Sensors
1 1-channel
2.1 1-channel
2.2 2-channel
equivalent
2.3 2-channel
nonequivalent
3.1 2-channel
equivalent
3.2 2-channel
nonequivalent
Evaluation of
the sensors
1oo1
1oo2
1oo2
1oo2
1oo2
"Requirements for Sensors and Actuators"
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
Sensor supply
Internal, with short-
circuit test
Internal, without short-
circuit test
External
Internal, with short-
circuit test
Internal, without short-
circuit test
External
Internal, without short-
circuit test
External
Internal, without short-
circuit test
External
Internal, with short-
circuit test
when using
Achievable
SIL/Category
2 / 3
3 / 3
3 / 4