Справочник Пользователя для Mitsubishi Electronics 2408f
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.
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:
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:
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
shielding foil
Copper shielding braid or shielding braid and
shielding foil
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.
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
-