Prosoft-technology ILX69-PBM Uživatelský manuál stáhnout pdf (Strana 19)

ILX69-PBM ♦ CompactLogix or MicroLogix Platform Contents

PROFIBUS Master Communication Module User Manual

ProSoft Technology, Inc. Page 19 of 124

February 4, 2015

If the ILX69-PBM is linked with only one other device on the bus, both devices must be

connected to the ends of the bus line. These devices must deliver the supply voltage for the

termination resistors. If three or more devices are connected to the bus, the ILX69-PBM can

be connected at any desired position.

Up to 32 PROFIBUS devices can be connected to one bus segment, without repeaters. If

several bus segments are linked to each other with repeaters, there can be up to 127

devices on the network.

The maximum permissible cable length of a PROFIBUS segment depends on the baud rate

used, see the following table.

Baud rate in kBit/s

Maximum distance

9.6

1,200 meters

3,940 feet

19.2

1,200 m

3,940 ft

93.75

1,200 m

3,940 ft

187.5

1,000 m

3,280 ft

500

400 m

1,310 ft

1,500

200 m

656 ft

3,000

100 m

328 ft

6,000

100 m

328 ft

12,000

100 m

328 ft

Only PROFIBUS certified cables, preferably the cable type A, should be used. The following

table contains important electrical data concerning PROFIBUS certified cable:

Parameter

Value

Impedance

35 to 165 Ohm at frequencies from

3 to 20 Mhz

Capacity per units

length

< 30 pF/m

Loop resistance

110 Ohm/km

Wire gauge

0.64 mm

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 123 124

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