Control Techniques UD77 DeviceNet Startup Manual page 7

DeviceNet cable with five (5) conductors
•
1 pair for 24V DC
•
1 pair for CAN data transmission
•
1 shield
•
Conductors (color coded to Open DeviceNet Network Vendors Association standard)
Thin Cable and/or Thick Cable.
•
Thin Cable P/N 1485C-P1-Cxxx (where xxx is length in meters) is rated at 3.0 amps DC.
Thin Cable can be used for the physical media for both Trunk Line and any Drop Line on a
small DeviceNet network.
• Thick Cable P/N 1485-A1-Axxx (where xxx is length in meters) is rated at 4.0 amps DC
(NEC in North America) or 8.0 amps elsewhere in the world. Thick Cable is usually used for
a DeviceNet Trunk Line, and details of its use are not described further in this guide.
Note: This guide describes an open-style daisy chain DeviceNet network with a single Trunk
Line utilizing Thin Cable.
Terminating Resistor
DeviceNet cable uses two open-style terminating resistors. These are included with
each 1747-SDN scanner. These have a value of 121 ohms (+/- 1%) and are rated at ¼
watt.
24 Volt DC regulated power supply
Rated from 1.0 to 8.0 amps, depending on the media used. For verification of a small
DeviceNet network such as described in this guide, the unregulated 24 Volt DC supply
found on the SLC 500 is adequate, and the use of Thin Cable for the media is
recommended. A regulated AC to DC +24 volt power supply rated at 1.0 amp (25 watts)
minimum to a maximum of 3.0 amps (75 watts) is required for a practical DeviceNet
network. Switching Regulators in a DIN-rail mounting format are among the latest
designs for these applications and are recommended.
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