Instruction Manual

Installation and Operation Handbook Safety Information
2408 and 2404 Controller E-3
Cable Specifications
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 165Ω at a frequency of 3
to 20 MHz.
135 to 165Ω 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
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 -
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.