Rockwell Automation 2098-IPD-020-DN Ultra5000 Series Intelligent Positioning Drives with DeviceNet Reference Manual - Manual (Page 82)

Publication 2098-RM002A-EN-P – October 2001
5-4 Troubleshooting DeviceNet Drives
Scanner Problems
If using a scanner, check the scan list, data rate, and addresses of
devices. Verify series and revision of the scanner is the latest. If the
scanner is Bus-off, recycle the 24V supply and then reset the scanner.
If the scanner goes Bus-off again, the problem is some combination
of:
• Defective node device
• Incorrect node data rate
• Bad network topology
• Faulty wiring
• Faulty scanner
• Faulty power supply
• Bad grounding
• Electrical noise
Power Supply Problems
If a single power supply is used, add up the current requirements of
all devices drawing power from the network. This total should be
considered the minimum current rating in selecting the power supply
used. In addition check the:
• Length and current level in trunk and drop cables
• Size and length of the cable supplying power to the trunk
• Voltage measured at the middle and ends of the network
• Noise in network power measured with an oscilloscope