Configuration
Fail-Safe Systems
4-2 A5E00085588-03
• Before downloading the Safety Program, you must download the configuration
to the CPU.
• If you use a safety protector in the ET 200M, then you can operate fail-safe
signal modules with the S7-300 standard signal modules in an ET 200M even
in safety mode in SIL 3.
• The safety protector protects the fail-safe signal modules from possible
overvoltage in the event of a fault. To do this, the fail-safe signal modules
must be inserted in the ET 200M configuration to the right of the safety
protector, and all the standard signal modules must be inserted to the left of
the safety protector.
The ET 200M components which can be used in safety mode depends on the
safety class and the use of a safety protector in the ET 200M configuration:
• If you comply with the requirements of safety class SIL 2 or use a safety
protector in SIL 3 in ET 200M, you can use the IM 153-2 for S7 F/FH Systems
or the IM 153-3 only for the S7 FH Systems and you can set up the
PROFIBUS-DP with the copper cable (as in standard mode).
• If you don’t use a safety protector in SIL 3 in ET 200M, you must connect the
PROFIBUS-DP lines of the S7 F/FH Systems with fiber optic cables, you can
only use the IM 153-2FO.
Additional Information
You can find a full description of the safety protector in the S7-300 Programmable
Controller, Fail-Safe Signal Modules; A5E00048969-03; edition 02/2001.
!
Safety Note – Safety Rules for Safety Operation
A safe operation is not possible if these rules are not complied with.
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