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SECTION 9
Troubleshooting and Maintenance
This section describes error processing, periodic maintenance operations, and troubleshooting procedures needed to keep
the DeviceNet network operating properly. We recommend reading through the error processing procedures before
operation so that operating errors can be identified and corrected more quickly.
9-1 Troubleshooting with the DeviceNet Unit Indicators . . . . . . . . . . . . . . . . . . . 200
9-1-1 Determining Operating Status from the Indicators. . . . . . . . . . . . . . 200
9-1-2 Troubleshooting Errors Occurring in the DeviceNet Unit . . . . . . . . 201
9-2 Error Log Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
9-2-1 Error Log Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
9-2-2 Error Codes and Detail Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
9-3 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
9-3-1 CPU Unit’s ERR/ALM Indicator Lit or Flashing. . . . . . . . . . . . . . . 222
9-3-2 Remote I/O Communications Disabled . . . . . . . . . . . . . . . . . . . . . . 222
9-3-3 I/O Link Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223
9-3-4 Communications Error Operation Settings. . . . . . . . . . . . . . . . . . . . 224
9-3-5 Scan List Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
9-4 Maintenance and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
9-4-1 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
9-4-2 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
9-4-3 Replacing Faulty Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226