Bronkhorst PROFIBUS-DP slave interface Uživatelský manuál stáhnout pdf (Strana 9)

BRONKHORST®

2.3 PROFIBUS DP CABLES

PROFIBUS cables are shielded twisted-pair copper cables which differ from each other in the type of wire

(fixed/flexible) and/or sheath. The two inner cores of a PROFIBUS cable have green and red insulation. The

specifications in this chapter are primarily intended to provide a general introduction and describe the cable

properties to be considered (see also IEC 61784-5-3).

The cables for PROFIBUS DP are assigned to categories, the so-called line types, which define specific physical

parameters. The individual line types are identified by the capital letters A, B, C and D. When planning a network you

should exclusively use line type A.

The table below shows the parameters of line type A that must be complied with.

Parameter

Specified limits

Impedance

135..165 Ω with f = 3...20 MHz

Operational capacity

≤ 30 pF/m

Loop resistance

≤110 Ω/km

Wire diameter

>0.64 mm

Wire CSA

> 0.34 mm2

2.4 MAXIMAL CABLE LENGTH WITH PROFIBUS DP

The maximum transmission distance (Trunk Line), that can be achieved using copper cables is directly related to the

transmission speed chosen for the PROFIBUS DP network. As a result, these two variables must always be considered

together. The data transmission rate of PROFIBUS DP is adjustable in defined steps between 9.6 and 12.000 kbits/s.

The data transmission rate must be identical for all segments of a PROFIBUS line. The table below shows the

maximum possible transmission distances that can be reached when using copper cables. The minimal cable distance

between two device connections is one (1) meter.

Transmission rate (kbits/s)

maximum Transmission distance* (L

) (meter)

9.6

1200

19.2

1200

45.45

1200

93.75

1200

187.5

1000

500

400

1500

200

3000

100

6000

100

12000

100

* Calculated for PROFIBUS cable type A at 30 pF/m

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