Siemens S7-400 installation manual Rules for Laying Cable, Installing the Connector Adapter

Networking

Installation Instructions for Plastic Fiber-Optic Cable (with Photos)

Here 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 instructions, 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.

Automation System S7-400	Hardware and Installation	5-29
A5E00850741-01