Rockwell Automation 57C442 Data Highway Plus Interface Module - Manual (Page 39)

5-1
5.0 DIAGNOSTICS AND
TROUBLESHOOTING
This section describes how to troubleshoot the Data Highway Plus
Interface module. See Appendix D for a list of error codes that can be
displayed by the module. If the problem cannot be corrected using the
procedures below, the unit is not user-serviceable.
5.1 The OK LED Is OFF
Problem: The green status LED (labeled “OK”) on the Data Highway
Plus Interface module faceplate is off. The LED should be on when the
module has passed its internal diagnostics after power-up. If the green
OK status LED is off, and no error code is displayed, a local watchdog
failure has occurred. Try cycling power to the rack. If the OK status LED
remains off, replace the module.
5.2 Invalid Station Address
Problem: Error code “3” or “6” appears on the Data Highway Plus
Interface module’s LED display at power-up. Error code “3” indicates a
duplicate station address. Error code “6” indicates an invalid station
address. To clear the error code, change the thumbwheel switch
settings and cycle power on the module.
5.3 Transmission Link Failures
Problem: Error codes “12”, “13”, “14”, “15”, or “17” are returned by the
GATEWAY_CMD_OK@ function. These error codes indicate various
network errors.
Verify that the cable connections to each device are secure. Check the
cable connection at the module faceplate and at the remote device.
Check the network cabling and
termination.
5.3.1 Rack Failure
If the AutoMax Processor in the rack that contains the Data Highway
Plus Interface module fails or issues a BOARD RESET command
(clears all outputs in the rack), the entire image in the Data Highway
Plus Interface module’s dual port memory is cleared. The module will
remain off-line for at least 1 second to allow application tasks to
recognize that the module went off-line.
!
ATTENTION: Only qualified electrical personnel familiar with
the construction and operation of this equipment and the hazards
involved should install, adjust, operate or service this equipment.
Read and understand this manual and other applicable manuals
in their entirety before proceeding. Failure to observe this
precaution could result in severe bodily injury or loss of life.