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Cabling and Wiring the System

6-22

SIMATIC 545/555/575 System Manual

Installing PROFIBUS-DP I/O Cables (continued)

Table 6-6 lists the PROFIBUS DIN 19245 cable line specifications.

Table 6-6 PROFIBUS-DP Cable Specifications

Parameter Value

Impedance 135–165 Ohm (3–20 MHz)

Capacitance 9.1 pF/ft. (<30 nF/km)

Resistance

33.5 W/1000 ft. (<110 Ohm/km)

Attenuation 0.27 dB/100 ft. (0.9 dB/100 m (f=200kHz))

Conductor Area 20–22 AWG (0.3 mm

... 0.5 mm

)

Cable Diameter 0.315 in. " 0.02 in. (8 mm " 0.5 mm)

Up to 10 bus segments can be connected in series. The distance between the

two most widely separated stations must not exceed the appropriate value

shown in Table 6-7. Use repeaters between each cable segment.

Table 6-7 PROFIBUS-DP Line Length Limits

Baud Rate

Maximum Segment

Length

Maximum Installation

Length

9.6 to 93.75 kbaud 3,930 ft. (1,200 m) 39,300 ft. (12,000 m)

187.5 kbaud 3,280 ft. (1,000 m) 32,800 ft. (10,000 m)

500 kbaud 1,310 ft. (400 m) 13,100 ft. (4,000 m)

1.5 Mbaud 660 ft. (200 m) 6,600 ft. (2,000 m)

3 to 12 Mbaud 330 ft. (100 m) 3,300 ft. (1,000 m)

PROFIBUS-DP Cable

and Connector

Specifications

PROFIBUS-DP Line

Length Limits

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 321 322

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Siemens SIMATIC TI500 Spezifikationen Seite 187