Rockwell Automation DEVICENET 1771-SDN Instalační manuál

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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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Shrnutí obsahu

Strany 1 - Termination Resistors:

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess DeviceNet will not function correctly if design rules are not followed. Eve

Strany 2 - Power Supply Discussion:

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess DeviceNet Scanner Status / Error Codes The bicolor (GREEN/RED) module stat

Strany 3 - Verify Network Voltages

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess -------------|-----------------------------|--------------------|----------

Strany 4 - Check the Wiring

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess ---------------|-----------------------------------------|-----------------

Strany 5 - Check the Nodes

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess ---------------|-----------------------------------------|-----------------

Strany 6

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess ---------------|-----------------------------------------|-----------------

Strany 7 - Points to Remember

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess Page 15 of 15 80%-90% of all network problems stem from miswiring, loose

Strany 8 - Ground Loops

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess Network Grounding: The DeviceNet cable must by grounded at only one locati

Strany 9

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess Verify Network Voltages It needs to be understood that DeviceNet is actual

Strany 10

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess Examine the System Design of the Installation  Walk the network if possi

Strany 11

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess  Check the Scanner Configuration  Verify the scanlist  Baud Rate 

Strany 12

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess If scanner goes bus off again, The problem is some combination of Defectiv

Strany 13

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess Points to Remember Pressing the reset button on the scanner does not reset

Strany 14

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess Opens or shorts may be the biggest problem. On an idle bus (without traffic

Strany 15 - Product Features

DDeevviicceeNNeett TTrroouubblleesshhoooottiinngg GGuuiiddeelliinneess DeviceNet QD Connectors Examining the connector with the keyway pointing do

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