Rockwell Automation 1788-CNCHKR ControlNet NetChecker User Manual - Manual (Page 20)

20 ControlNet NetChecker
Rockwell Automation Publication 1788-UM001B-EN-P - August 2012
Additional Tips
Use these tips to troubleshoot intermittent problems and maintain continuous network
monitoring.
Intermittent Problems
Various intermittent problems are often are caused by the BNC connectors on the trunk cable,
such as the center pin not crimped causing an unreliable contact. The NetChecker in Diagnostic
mode is a valuable tool to help locate such problems. Read the NetChecker while subjecting each
trunk connector or tap to a moderate mechanical stress. If faults are reported, the BNC
connector has not been mounted correctly and must be replaced.
Continuous Network Monitoring
To provide continuous monitoring, the NetChecker powered by an AC wall adapter can be
installed temporarily or permanently on the network. The NetChecker will signal immediately
any degradation of the signal quality at the media level even if the network is still performing
correctly. The NetChecker should be set in Diagnostic mode.