Allen-Bradley 825-P, User Manual

Page: 160 / 266

160 Rockwell Automation Publication 825-UM004D-EN-P - November 2012
Chapter 11 Testing & Troubleshooting
Troubleshooting DeviceNet Table 91 - DeviceNet Troubleshooting Procedures
Troubleshooting Device
Backplane Communication Table 93 - Device Backplane Communication Troubleshooting Procedures
Table 92 -
Network Status LED Definition Possible Cause
Off The device has not completed the initialization, is not on an
active network, or may not be powered up. Check to ensure that the product is wired correctly and configured on the network.
Flashing Green – Red – Off Power-up LED test. No action required.
Solid Green The device is operating in a normal condition, and is
communicating to another device on the network. No action required.
Flashing Green The device is operating in a normal condition, is online, but with
no connection to another device. This is the typical state for new
devices. The device could need to be mapped to a master scanner, placed in a scanlist, or have
another device communicate to it.
Flashing Red Recoverable fault has occurred. Ensure that the PLC and scanner are operating correctly and that there are no media
or cabling issues. Check to see if other networked devices are in a similar state.
Solid Red The device has detected a major error that has rendered it
incapable of communicating on the network (Duplicate MAC ID,
Bus off, media issue). Troubleshooting should be done to ensure that the network is correct (terminators,
lengths, etc.) and there is not a duplicate node problem. If other devices on the
network appear to be operating fine and power cycling the device does not work,
contact Technical Support.
Flashing Red and Green The device is in a communication faulted state. Power cycling the device could resolve the problem; however, if the problem
continues, it could be necessary to contact Technical Support.
Flashing Red and Green The device has detected a network access error and is in a
communication faulted state. The device has subsequently
received and accepted an Identify Communication Faulted
Request Protocol message. This is not a common state for DeviceNet products. Power cycling the device could
resolve the problem, however if the problem continues it could be necessary to find
out what is causing the problem.
Table 94 -
Bus Status LED Definition Possible Cause
Off The device is in Power-up mode. Check to ensure that the product is wired correctly. Confirm that the product has
appropriate DeviceNet and control power. Verify that the 825-PDN card is inserted
correctly.
Green The device is operating in a normal condition. No action required.
Red The 825-PDN card has lost backplane communications
with the 825-P relay. Confirm product has appropriate DeviceNet and control power.