Siemens SIMATIC ET 200eco Manual page 61

Conditions for Achieving AK/SIL/Category
The conditions for achieving the respective safety requirements are presented in
the following table.
Table 8-3
Application
2.1
2.2
2.3
3.1
3.2
Note
You can operate the various inputs of a fail-safe I/O module simultaneously in
AK4/SIL2/Category 3 and in AK6/SIL3/Category 3 or 4. You only need to
interconnect and assign parameters for the inputs as shown in the following
sections.
Sensor Requirements
When using sensors for safety-related applications, please note the information in
Section 5.5 "Requirements for Sensors".
ET 200eco Distributed I/O Station Fail-Safe I/O Module
A5E00297494-02
ET 200eco 4/8 F-DI: Conditions for Achieving the AK/SIL/Category
Sensor
1 1-channel
1-channel
2-channel
equivalent
2-channel non-
equivalent
2-channel
equivalent
2-channel non-
equivalent
Evaluation Sensor power
of sensors supply
1oo1 Internal, with short-
circuit test
Internal, without
short-circuit test
External
1oo2 Internal, with short-
circuit test
Internal, without
short-circuit test
External
1oo2 Internal, without
short-circuit test
External
1oo2 Internal, without
short-circuit test
External
1oo2 Internal, with short-
circuit test
Digital F I/O Module
Achievable
AK/SIL/
Category
4/2/3
6/3/3
6/3/4
8-9