Siemens SIMATIC NET PROFIBUS manual C D, Connecting the Optical Cables

Installation and Startup

Connecting the Optical Cables

A B C D

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

SConnect the individual PROFIBUS OBTs using a duplex FO cable, fitted with two pairs of simplex connectors.

SMake sure that in each case an optical input is connected to an optical output (crossover).

SMake sure that there is reliable strain relief for the FO cable and do not bend the cable beyond the minimum bending radius.

SClose unused FO sockets with the plastic plugs provided. Extraneous light, particularly when it is extremely bright can cause disturbances on the PROFIBUS network.

SRemember the minimum and maximum length of the FO cable and the permitted fiber types specified in Table 1 and in the technical specifications.

SYou should also make sure that no dust can enter the optical components. Dust in optical components can make them unusable.

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

5-6	PROFIBUS Optical Bus Terminal (OBT)
	C79000-G8976-C122-02