Siemens SIMATIC S7-400 Hardware And Installation Manual page 142

Networking
Installation instructions for plastic fiber-optic cable (with photos)
You will find detailed installation instructions and a series of photographs on fitting
plastic fiber-optic cables with Simplex connectors:
In the appendix of the SIMATIC NET PROFIBUS Networks manual
On the Internet
– German: http://www.ad.siemens.de/csi/net
– English: http://www.ad.siemens.de/csi_e/net
Click SEARCH on this page, enter the number "574203" under "Entry-ID" and
start the search function.
Enclosed with the Simplex connector/polishing set
Title: Assembly instructions for SIMATIC NET PROFIBUS Plastic Fiber Optics with
Simplex connectors
Rules for laying cable
When you lay plastic fiber-optic cable, please adhere to the following rules:
Use only the Siemens fiber-optic cables specified in Section 5.8.1
Never exceed the maximum permissible stresses (tensile load, crushing, etc.)
of the cable you are using specified in Table 5-4. Impermissible crushing can
occur, for example, when screw clamps are used to fix the cable in place.
Follow the steps specified in the installation instructions, and use only the tools
specified there. Grind and polish the fiber ends carefully.
Note
Polishing the fiber ends of the fiber-optic cable, as described in the installation in-
structions, reduces attenuation by 2 dB.
Grind and polish by pressing the connector only lightly against the abrasive
paper or polishing foil in order to prevent the connector fusing with the fiber.
Ensure that you maintain the bend radii specified in Table 5-4 during grinding
and polishing, particularly when cables are supported for mechanical strain
relief. In this case, ensure an adequate whip length.
Ensure that there are no loops when cables are cut to length. Under tensile
load, loops can cause kinks to form in the cable and thus damage it.
Ensure that the outer and conductor sheathing of the cable and the fibers are
not damaged. Scoring and scratches can let light escape and thus lead to
higher attenuation values and line failure.
Never insert dirty connectors or connectors with protruding fibers in the device
sockets. This can destroy the optical sending and receiving elements.
Installing the connector adapter
The installation of the cut fiber-optic cable with connector on the PROFIBUS
devices is module-specific, and it is therefore described in the manual for the
PROFIBUS device with an integrated fiber-optic cable interface.
5-32
www.gkbpx.com
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01