Siemens SIMATIC NET PROFIBUS Betriebsanleitung PDF herunterladen (Seite 39)

Installation and Maintenance

5.1 Installation

SIMATIC NET PROFIBUS Optical Link Module OLM V4.0

Operating Instructions, 01/2013, C79000-G8976-C270-03

5.1.2 Connecting optical cables

Figure 5-3

View of the module from below

with optical channels 2 and 3

(device with two optical

channels)

 Connect the single modules via a two-core fiber-optic cable

with BFOC/2.5 connectors.

 Make sure

– that the end faces of the optical connectors are clean.

– that always one optical input and one optical output are

interconnected (“crossover connection“). The BFOC

sockets of a channel that belong together are marked on

the lower part of the front panel.

– that the optical connector is securely locked to the BFOC

socket (bayonet connector must be locked).

– that the tip of the BFOC connector is inserted completely

into the fiber-optic cable socket when using single mode

fiber-optic cables. If necessary, push the connector into

the socket using anti-kink sleeve to make reliable contact.

 Make sure there is adequate strain relief for the fiber-optic

cable and keep to the minimum bending radii of the fiber-

optic cables (see note below).

 Close unused BFOC sockets with the supplied protective

caps (note: An unused optical channel should be set to the

“bus without fiber-optic link monitoring“ mode so that it does

not cause a broken fiber-optic cable signal). Incoming

external light can disturb the network, especially if the area

is bright. Intruding dust can destroy the optical components.

 Keep to the maximum length of the fiber-optic cables and

the possible fiber types, as shown in Table 2-1, page 4. and

in the technical specifications, section 4.1.

 Test the qu

ality of the link using the measurement socket

after installing the optical network. The values must be

within the permissible range according to section 5.6.

Notice

glass fiber-optic cable may be connected to an OLM that uses plastic fiber-optic cable and vice

versa.

Note

The laying of fiber-optic cables requires special measures. Mechanical stress such as traction,

pressure or kinking must be avoided. The cable manufacturers specify minimum bending radii for

fiber-optic cables both during installation and operation. The bending radii and the requirements when

laying cables depend largely on the cable type used and must therefore be checked up in the

instructions in the relevant data sheets. Ignoring these requirements may lead to higher attenuation

values and, in the worst case (extreme bending), to destruction of the fiber-optic cable.

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