Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
43
Wiring
5
WARNING
It is strictly forbidden to override any safety functions or to take any measures to this effect,
as this would lead to serious risk of injury and of damage to the environment. The
manufacturer shall not be liable for any consequential damage incurred as a result of such
manipulation, or for material or immaterial damage which may be caused if this warning is
ignored.
Note
The maximum cable lengths currently specified in this manual ensure against functional
impairment, even without more precise examination of the boundary conditions. However,
you must comply with the specifications in the documentation.
If the boundary conditions, such as EMC, cable type, cable routing, etc., are examined more
precisely, longer cables can be used for all F-SMs.
In this chapter
This chapter contains information about:
● Operation of F-SMs with PELV
● Special features in terms of F-SM wiring
● Special features in terms of the replacement of F-SMs
Additional information
For information about the wiring rules for fail-safe and standard signal modules, refer to the
S7-300 Automation System, Hardware and Installation:
CPU 31xC and CPU 31x: Installation
manual.
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