Siemens S7-300 - 5.2 Wiring Fail-Safe Signal Modules

Wiring
5.2 Wiring Fail-Safe Signal Modules
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
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Power supply requirements for compliance with the NAMUR recommendation
Note
Always use power supply modules/units (230 V AC → 24 V DC) with integrated function for
power failure backup for the duration of at least 20 ms in accordance with NAMUR
recommendation NE 21, IEC 61131-2, and EN 298. Power supply components available
(examples):
S7-400
 6ES7407-0KA01-0AA0 for 10 A
 6ES7407-0KR00-0AA0 for 10 A
S7-300
 6ES7307-1BA00-0AA0 for 2 A
 6ES7307-1EA00-0AA0 for 5 A
 6ES7307-1KA00-0AA0 for 10 A
These requirements, of course, also apply to power supply modules/units which are not
produced according to S7-300/400 installation technology.
5.2 Wiring Fail-Safe Signal Modules
Wiring similar to standard signal modules
The fail-safe signal modules belong to the S7-300 module family and are wired similar to any
standard signal module in the S7-300 or ET 200M system.
For further information on the wiring of fail-safe signal modules, refer to the
S7-300, CPU
31xC and CPU 31x: Installation
Operating Instructions.
The information in the module chapters includes special features to observe when wiring
specific F-SMs and the wiring diagrams for various applications with F-SMs.
WARNING
Note the following when assigning signals of fail-safe digital input modules:
 Do not route signals within the same cable or light plastic-sheathed cable if their short
circuit could conceal a serious safety risk.
 Only route signals within the same cable or light plastic-sheathed cable that are supplied
by different sensor supplies of this F-DI module.