Installation manual

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DeviceNet will not function correctly if design rules are not followed.
Even a Network previously thought to be functioning correctly may begin
to exhibit abnormal or anomalous operation due to incorrect system design.
The following are tips to help locate and correct these abnormalities.
For specific DeviceNet system installation information.
Please refer the "DeviceNet Planning and Installation Manual".
Manuals can be ordered via the Internet at http://www.theautomationbookstore.com/
Verify that all devices on the network have been certified by ODVA and
carry the DeviceNet Conformance check on their name plate.
Termination Resistors:
A termination resistor equal to 121 Ohms 1% , 1/4W must be attached at each end of the
Trunk cable. The resistors must be connected across the Blue & White wires of the
DeviceNet cable.
Resistor connection can be verified by disconnecting DeviceNet power and measuring
the resistance across the Can_H & Can_L lines (Blue & White Wire). This can be
measured with an Ohm meter. The reading should be approximately 60 Ohms.
Very Important: The DeviceNet network will not operate correctly without terminating
resistors. Termination resistors can be ordered from your local Allen-Bradley Distributor
using the part number 1485A-C2.
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