Siemens Simatic S7-1500 Manual page 33

Conditions for achieving SIL/Cat./PL
The table below lists the conditions which have to be met for achieving at least the
corresponding safety requirements.
Table 5- 1
Note
You can operate the various inputs of an F-DI module simultaneously in SIL3/Cat.3/PLd and
in SIL3/Cat.3 or Cat.4/PLe. You only have to interconnect the inputs and assign parameters
as described in the following sections.
Sensor requirements
Information on the safety-related use of sensors is available in the section Requirements for
sensors and actuators for fail-safe modules of the system manual S7-1500 Automation
System (http://support.automation.siemens.com/WW/view/en/59191792).
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA
Conditions for achieving SIL/Cat./PL
Application Sensor evaluation
1
2
equivalent
3.1
equivalent
3.2
non-equivalent
5.2 Application 1: Safety mode SIL3/Cat.3/PLd
1oo1
1oo2 Internal, without short-circuit test
1oo2 Internal, with short-circuit test
1oo2 External or internal, with short-
Applications of the F-I/O module
Sensor supply
Any
External
circuit test
Achievable
SIL/Cat./PL
3 / 3 / d
3 / 3 / e
3 / 4 / e
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