Cable Color Code Section 3 Installation
62 9ARD000015-600
Cable Color Code
Table 55 lists the color coding for the cables.
Grounding and Isolation
To avoid ground loops, the DeviceNet network should be grounded in only one
location. The physical layer circuitry in all devices are referenced to the V- bus
signal.
Connection to ground is provided at the bus power supply. For information on
network grounding, refer to Network Grounding on page 20. No significant electric
current flow between V- and earth ground may occur through any device other than
a power supply. Under normal operating conditions, the allowable electric current is
1 mA. A ground isolation barrier must exist for every device as shown in Figure 21.
Products can pass testing according to Federal, State and Local regulations. Higher
working voltages or test voltages may be supported based upon specific application
requirements. In such cases, higher rated voltages and any additional tests are
required.
Table 55. Color Coding for Cables
Wire Color Identity
White CAN_H
Blue CAN_L
Red V+
Black V-
Bare
(1)
(only for round cables)
(1) The shield does not exist in flat cables.
Shield
Ground isolation barrier may exist external to the DeviceNet product. For
example, in case of some proximity sensors, the barrier may be plastic mounting
hardware. Some products may have more than one potential path to ground. In
such products, isolation must exist for all possible paths.
To Next Page
General
