Siemens SIMATIC NET PROFIBUS Provozní pokyny stáhnout pdf (Strana 456)

100

101

Installation and Startup

5-6

PROFIBUS Optical Bus Terminal (OBT)

C79000-G8976-C122-02

Connecting the Optical Cables

ABCD

Figure 5-4 View of the Module from Below with the Optical Channels CH2 and CH3

A = CH2, optical receiver

B = CH2, optical sender

C = CH3, optical receiver

D = CH3, optical sender

S Connect the individual PROFIBUS OBTs using a duplex FO cable, fitted with

two pairs of simplex connectors.

S Make sure that in each case an optical input is connected to an optical output

(crossover).

S Make sure that there is reliable strain relief for the FO cable and do not bend

the cable beyond the minimum bending radius.

S Close unused FO sockets with the plastic plugs provided. Extraneous light,

particularly when it is extremely bright can cause disturbances on the

PROFIBUS network.

S Remember the minimum and maximum length of the FO cable and the

permitted fiber types specified in Table 1 and in the technical specifications.

S You should also make sure that no dust can enter the optical components. Dust

in optical components can make them unusable.

S The fibers of the cable must be flush with the front surface of the connector.

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