Publication 2707-UM005B-EN-P
8-4 Troubleshooting and Maintenance
Communication Error Codes
Communication Error Codes appear on the MicroView display as
follows:
The communication error codes are displayed as a result of a remote
error occurring at the MicroLogix controller. These error codes are
generated by the controller and provide valuable troubleshooting
information when other symptoms either have not been discovered or
have not been understood.
For a complete list of error codes, consult the troubleshooting section of the user
manual for your MicroLogix 1000 Controller (Publication No. 1761-6.3).
Using the Test Functions
Use the test selection screen to test or check the following:
• Reset (resets terminal, terminates test function, Page 8-5)
• Display (Page 8-5)
• Core ROM (Page 8-6)
• Random Access Memory (Page 8-7)
• System ROM (Page 8-8)
• Program ROM (Page 8-9)
• Keyboard (Page 8-10)
• Communications port (Page 8-12)
• Watchdog hardware operation (Page 8-13)
Error Code
Com Error Code: nnH
Press ENTER to Reset
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