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DeviceNet Pass-Through Cable
7.7 DeviceNet Pass-Through Cable
DeviceNet is a <strong>com</strong>munications link that connects industrial I/O devices to a message
packeting network. All devices connect to the same backbone cable, eliminating the need
for individual wiring for each I/O point.
NOTE: The DeviceNet cable in the robot is strictly for pass-through. If
DeviceNet is used, it must be implemented from the user-supplied PLC.
The PLC Server does not support DeviceNet.
<strong>Adept</strong> incorporates the following DeviceNet ready hardware in the <strong>Adept</strong> <strong>Cobra</strong> PLC
robot:
• Female connector for the robot tower; Micro-style 12 mm thread DIN female
connector (see Figure 7-11 on page 114)
• Male Micro-style 12 mm thread DIN connector at the robot base.
• A nonstandard DeviceNet cable consisting of two shielded twisted pairs that
connect the above connectors. <strong>Adept</strong> considers this cabling to be a drop line with a
maximum total length of 6 meters and therefore uses the following wire sizes:
Wire
Power pairs
Signal pairs
<strong>Adept</strong>
24 AWG
(0.25 mm 2 )
28 AWG
(0.08 mm 2 )
DeviceNet
“thin cable”
22 AWG
(0.34 mm 2 )
24 AWG
(0.25 mm 2 )
This means that total current on the power pairs must be limited to 2A instead of
the standard 3A in a DeviceNet trunk line. Because this is intended to be a
DeviceNet “drop line” with a maximum of 6 meters (16.5 feet), the full data rate
should be achievable. However, <strong>Adept</strong> has tested the internal cable only at 125k
baud.
Re<strong>com</strong>mended Vendors for Mating Cables and Connectors
A variety of vendors have molded cable assemblies for the “Micro-style” connector
including Brad Harrison, Crouse Hinds, Lumberg, Turk, and others. In addition,
Hirshmann, Phoenix Contact, and Beckhoff have mating micro connectors that have
screw terminals in the plug to allow the user to make custom cables.
<strong>Adept</strong> <strong>Cobra</strong> <strong>PLC600</strong>/PLC800 Robot User’s <strong>Guide</strong>, Rev B 113