Siemens SIMATIC ET 200S Installation And Operating Manual page 115

Conditions for Achieving AK/SIL/Category
The conditions for achieving the respective safety requirements are presented in the
following table.
Table 7-20
Note
You can operate the various inputs of an F-DI module simultaneously in AK4/SIL2/
Category 3 and in AK6/SIL3/Category 3 or 4. You only have to connect the inputs and assign
parameters as shown in the following chapters.
Sensor Requirements
When using sensors for safety-related applications, please note the information in
Requirements for Sensors and Actuators
ET 200S Distributed I/O System - Fail-Safe Modules
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04
EM 4/8 F-DI DC24V PROFIsafe: Conditions for Achieving AK/SIL/Category
Application Sensors
1 1-channel
2.1 1-channel
2.2 2-channel
equivalent
2.3 2-channel, non-
equivalent
3.1 2-channel
equivalent
3.2 2-channel, non-
equivalent
7.5 4/8 F-DI VDC24V PROFIsafe Digital Electronic Module
Evaluation of
the Sensors
1oo1
1oo2
1oo2
1oo2
1oo2
.
Fail-Safe Modules
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
Achievable
AK/SIL/
Category
4 / 2 / 3
6 / 3 / 3
6 / 3 / 4
7-55