Wiring Instructions
74/86
netTAP NT 50 | Gateway Devices
DOC091202UM09EN | Revision 9 | English | 2013-02 | Released | Public
© Hilscher, 2010-2013
10.5 DeviceNet
Up to 64 DeviceNet devices can be linked together over the bus. The
maximum length of the bus cable depends on the used baud rate and the
used cable type. Only special proved DeviceNet cable should be used.
The maximum length of the DeviceNet cable depends from the baud rate
and from the chosen cable type. In the following table, these are listed in
the following table:
Baudrate in kbit/s
Maximum length of
cable (thick cable)
Maximum length of
cable (thick cable)
125
500 m
100 m
250
250 m
100 m
500
100 m
100 m
Table 71: Maximum length in dependence from the Baud Rate for DeviceNet Cables
The data line cables must match the following conditions:
Data line
cable
Impedance
Capacity
Loop Resis-
tance
Wire
Gauge
(Diameter)
Thick
120 Ohm
<39,4 pf/m
<22,6 Ohm/km
2 * 1.1 mm
Thin
120 Ohm
<39,4 pf/m
<91,8 Ohm/km
2 * 0,6 mm
Table 72 Characteristics of DeviceNet Data Line Cable
The power supply cables must match the following conditions:
Power
supply
cable
Loop Resis-
tance
Wire Gauge
(Diameter)
Thick
<11,8 Ohm/km
2 * 1.4 mm
Thin
<57,4 Ohm/km
2 * 0,7 mm
Table 73: Characteristics of DeviceNet Power Supply Cable
Figure 14: DeviceNet Network
Please ensure that termination resistors with 120 Ohm are available at both
ends of the cable.
Further devices can be connected via T-stubs to the bus cable. The maxi-
mum length of all T-stubs is 6 m. The whole length of the bus cable and all