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SECTION 14
Troubleshooting and Error Processing
This section describes error processing, periodic maintenance operations, and troubleshooting procedures needed to keep
the EtherNet/IP network operating properly. We recommend reading through the error processing procedures before
operation so that operating errors can be identified and corrected more quickly.
14-1 Checking Status with the Network Configurator . . . . . . . . . . . . . . . . . . . . . . 340
14-1-1 The Network Configurator’s Device Monitor Function . . . . . . . . . . 340
14-2 Using the LED Indicators and Display for Troubleshooting . . . . . . . . . . . . . 347
14-2-1 Errors Occurring at the EtherNet/IP Unit or
Built-in EtherNet/IP Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347
14-3 Connection Status Codes and Error Processing . . . . . . . . . . . . . . . . . . . . . . . 358
14-4 Error Log Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
14-4-1 Error Log Data Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
14-4-2 Error Log Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
14-4-3 FINS Commands for Error Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
14-4-4 Error Log Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
14-5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368
14-5-1 CPU Unit's ERR/ALM Indicator Lit or Flashing . . . . . . . . . . . . . . . 368
14-5-2 General Ethernet Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
14-5-3 Tag Data Links Fail to Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
14-5-4 Tag Data Link Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
14-5-5 Message Timeout Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
14-6 Troubleshooting with FINS Response Codes . . . . . . . . . . . . . . . . . . . . . . . . . 371