Siemens SIMATIC NET PROFIBUS Provozní pokyny stáhnout pdf (Strana 449)

100

101

Network Topology

4-3

PROFIBUS Optical Bus Terminal (OBT)

C79000-G8976-C122-02

4.3 Attaching RS-485 Segments

The OBT allows the attachment of a single PROFIBUS DP node. To attach

RS-485 segments with more than one node, a further network component is

available, the OLM 12M. The requirement for using the OLM 12M is that the

PROFIBUS DP network is operated at a transmission rate of 187.5 Kbps, 500

Kbps, 1.5 Mbps or 12 Mbps.

The optical channels of the OLM 12M can be connected as follows with the OBT or

with other SIMATIC devices on the optical PROFIBUS DP:

The connection is established with a two-fiber plastic FO cable (maximum length

50 m) or PCF FO cable (maximum length 300 m). The fiber-optic cable has two

simplex connectors at each end. The optical channel of the OLM 12M connected

to the OBT must be operated in the “Line“ mode with the monitoring deactivated.

1) PROFIBUS cable

(terminated at both ends)

2) PROFIBUS cable

3) PROFIBUS connector (not terminated)

4) Plastic FO or PCF FO with two fibers

ET 200M without

FO interface

DP node without

FO interface

SIMATIC S7-400

with IM 467

ET 200M without

FO interface

Terminating resistor activted

OBT

Figure 4-2 Example of Attaching RS-485 Segments

1 2 ... 444 445 446 447 448 449 450 451 452 453 454 ... 489 490

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