Wiring 2408
f & 2404f PROFIBUS Communications Handbook
3-2 2408
f and 2404f 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
Ω
at a frequency of 3 to 20 MHz.
135 to 165
Ω
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
-
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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