Rockwell Automation 1500 DeviceNet MV Controllers Installation Instructions - Manual (Page 14)

4-2 Linking DeviceNet Communication Cables in Medium Voltage Controllers
1500-IN057C-EN-P – June 2013
3. When joining new sections to an existing MV MCC, remove the
terminating resistor from the original end section (the one to which
new sections were just joined). Install the terminating resistor
according to the information supplied in the section ―Terminating
Resistors‖ and ―Installing Terminating resistors‖ .
4. When new sections are added, always do the following design
calculations:

Check the total number of nodes. See ―Designing Cable Systems‖ .
If the number of nodes exceeds the guidelines, add a network
 Recalculate the total power consumption. If it exceeds 8A, add a
power supply
 Verify cumulative trunk length. See ―Designing Cable Systems‖.
 Verify cumulative drop length. See ―Designing Cable Systems‖.
General
This section describes the recommended procedure for connecting
DeviceNet communication cables (trunk lines) in CENTERLINE and
INTELLICENTER® MV controllers to equipment remote from the MV
controller line-up.
The DeviceNet connection will be to the end of the trunk line in the MV
controller section nearest to the equipment. This effectively makes the
connecting cable an extension of the trunk line. Refer to DeviceNet Media:
Design and Installation Guide (Publication DNET-UM072_-EN-P)
for
length restrictions and associated effects on data transmission rates.
Procedure
Class 2 DeviceNet cable is NOT recommended for extending the trunk.
Obtain approved DeviceNet cable long enough to connect between the
MV controller line-up and remote equipment. The Belden Class 1
shielded round trunk cable, Belden 7896A, is recommended. When using
this cable use trunk length limits for the flat cable. Refer to DeviceNet
publications such as DN-6.7.2-MAY99 for details about attaching
connectors to cables. To strip flat cable, make a shallow cut on each flat
surface and edge. Flex the cable jacket to complete the break, then pull
the jacket free from the wires. Strip away approximately ¼ inch (6.35mm)
insulation from each of the four conductors.
Connecting DeviceNet
to Equipment Remote
from the MV Controller
Line-up