Rockwell Automation 1500 DeviceNet MV Controllers Installation Instructions - Manual (Page 23)

DeviceNet Power Supply 6-3
1500-IN057 C-EN-P – June 2013
Connecting Two Power Supplies
When an additional 24 Vdc Class 1 power supply must be installed for
MV controller line-ups, the red trunk conductor between the power
supplies must be broken. Locate a linking connector between sections
and disconnect the red conductor (refer to the following figure).
Ground only ONE of the two power supplies.
Power Supply Power Supply
Red V+
White CAN_H
Blue CAN_L
Black V- (common)
break
Power Supply Power Supply
Red V+
White CAN_H
Blue CAN_L
Black V- (common)
break
Figure 6.2 – Connecting Two DeviceNet Power Supplies
MCC line-ups with more than 10 2-Hi sections could exceed the 39
meters (128 feet) cumulative drop limit to support 500 kbps
communications. When the trunk length exceeds this limit, 250 kbps
communications should be specified.