Siemens SIMATIC Operating Instructions

Fail-Safe Electronic Modules
8.1 8 /16 F-DI DC24V PROFIsafe Digital Electronic Module
ET 200pro Distributed I/O System - Fail-Safe Modules
64 Operating Instructions, 05/2007, A5E00394073-02
Conditions for Achieving SIL/Category
The conditions for achieving the respective safety requirements are presented in the
following table.
Table 8-3 F-DI Modules: Conditions for Achieving SIL/Category
Use case Sensors Evaluation of
the sensors
Sensor supply Achievable
SIL/Category
Internal, with short-
circuit test
Internal, without short-
circuit test
1 1-channel 1oo1
External
2 / 3
Internal, with short-
circuit test
Internal, without short-
circuit test
2.1 1-channel 1oo2
External
Internal, without short-
circuit test
2.2 2-channel
equivalent
1oo2
External
Internal, without short-
circuit test
2.3 2-channel
nonequivalent
1oo2
External
3 / 3
3.1 2-channel
equivalent
3.2 2-channel
nonequivalent
1oo2 Internal, with short-
circuit test
3 / 4
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 "Requirements for Sensors and Actuators" when using
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)

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)