5.2
Recommended cable
Profibus, RS485, Suconet K
No special connection cables are necessary for the installation of the DDLS 170
supply and control lines. The Profibus standard specifies two cable types for the
connection of the data lines into the FMS and DP systems.
Cable type A is particularly suited for high transmission rates and long ranges. Ca-
ble type B should be used only with short ranges and transmission rates up to 500
kbit/s.
Cable type A
Cable type B
Intrinsic impedance
135...165
W
(at 3...20 MHz)
130...135
W
(at f > 100 kHz)
Cable capacitance
< 30 pF / m
typ. < 30 pF / m
Wire cross section
min. 0.34 mm
2
min. 0.22 mm
2
Cable type
twisted pairs, 1x2; 2x2;
or 1x4 conductor
twisted pairs, 1x2; 2x2;
or 1x4 conductor
Resistance
< 110
W
/ km
< 110
W
/ km
Signal loss
max. 9 dB over entire
line length
max. 9 dB over entire
line length
Shielding
copper-mesh shielding
or mesh shielding and
foil shielding
copper-mesh shielding
or mesh shielding and
foil shielding
INTERBUS, RS422
Cables with the following specifications are recommended for use in the INTER-
BUS system:
Designation
LI-YCY ...
Type
4-conductor, twisted pair
Wire cross section
0.14 mm
2
Resistance
< 140
W
/ km
Insulation resistance of
the wires
min. 200 M
W
/ km
Mutual capacitance
max. 120 nF / km
Test volt. wire / wire
1200 V
Test volt. wire / shielding
1200 V
Shielding
copper-mesh shielding or
mesh shielding and foil shielding
26
DDLS 170
Leuze electronic
