Siemens SIMATIC NET PROFIBUS manual Additional Instructions on Installing Fiber-Optic Cables

Installing LAN Cables

C.8 Additional Instructions on Installing Fiber-Optic Cables

Protecting Connectors from Contamination

Fiber-optic cable connectors are sensitive to contamination. Unconnected male and female connectors must be protected with the supplied dust caps.

Attenuation Variations under Load

During installation, the fiber-optic cables must not be twisted, stretched or crimped. The specified limit values for tensile strain, bending radii and temperature ranges must be adhered to. During installation, the attenuation values can vary slightly, these variations are, however, reversible providing the strain limits are not exceeded.

Using the Pulling Loop, Protecting Connectors

Preassembled SIMATIC NET PCF fiber–optic cables are supplied with a pulling loop and Kevlar sleeve to allow them to be pulled. Make sure that you only connect your traction device to this loop. You will find detailed instructions about using the loop in Appendix D.

Fitting Strain Relief

Although the BFOC connectors have integrated strain relief and provide protection against kinking, it is advisable to secure the cable additionally as close as possible to the connector to protect it from mechanical stress.

Plan Adequate Attenuation Reserves

When installing the cables over long distances, it is advisable to include one or more future repair splices in the power loss budget.

Electromagnetic Immunity

Fiber-optic cables are immune to electromagnetic interference. This means that the cables can be laid in conduits along with other cables (for example

230 V/380 V power supply cables) without any problems occurring. When the cables are installed in cable conduits, make sure that when other cables are pulled through, the maximum strain on the fiber-optic cables is not exceeded.

C-24	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000