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Cable specifications – MITSUBISHI ELECTRIC 2408f User Manual

Page 7

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Wiring 2408

f

& 2404

f

PROFIBUS Communications Handbook

3-2 2408

f

and 2404

f

PROFIBUS Communications Handbook

Either of the two cable types detailed below can be used. Please note that the cable types A and B,
specified below, are NOT related to the wire numbers A and B in the above wiring diagram. Type A
is recommended as it allows higher speed and longer cable length.

Type A cable

Type B cable

Characteristic
Impedance:

135 to 165

at a frequency of 3 to 20 MHz.

135 to 165

at a frequency of > 100 kHz

Cable
capacitance:

< 30 pF per Metre

typ. < 60 pF per Metre

Core diameter:

max. 0.34 mm², corresponds to AWG 22

max. 0.22 mm², corresponds to AWG 24

Cable type:

twisted pair cable. 1x2 or 2x2 or 1x4 lines

twisted pair cable. 1x2 or 2x2 or 1x4 lines

Resistance:

< 110 Ohm per km

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Shielding:

Copper shielding braid or shielding braid and
shielding foil

Copper shielding braid or shielding braid and
shielding foil

Belden B3079A meets cable A specifications, but there are other choices. For more information refer
to the ‘PROFIBUS Product Guide’ produced by the PROFIBUS User Group.

Maximum line length per segment

Baud rate (kbit/sec)

9.6

19.2

93.75

187.5

500

1500

Type A cable

1200m

1200m

1200m

1000m

400m

200m

Type B cable

1200m

1200m

1200m

600m

200m

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