Rockwell Automation 198 Series C Modular DeviceNet Starter Auxiliary User Manual - Manual (Page 131)

Publication 198-UM002A-EN-P December 2001
Chapter
6
Troubleshooting
Chapter Objectives
The purpose of this chapter is to help troubleshoot the Modular DSA I/O System.
Diagnostics
The MDSA System contains a number of diagnostic features. While it is not possible for this
manual to cover all possible scenarios, this chapter covers the basic diagnostic features of the
product.
Red I/O Light
During the MDA configuration sequence, the I/O error code 1, Modules Added, is
commonly encountered. Whenever a module is added to the current configuration, the I/O
light on the DeviceNet module will turn red. Attributes 34…49 of the DeviceNet interface
object (class 180) may be used to verify the correct module was located in the desired
position. If the configuration is correct, then sending a 1 to Attribute 27 of the DeviceNet
interface object (class 180) will cause the DeviceNet module to accept the configuration and
store it in EEprom. The validity of the data in the EEprom is checked and if an unrecoverable
error occurs, the I/O error code 9, EEprom error, is generated. This error requires the
replacement of the DeviceNet module to correct.
During normal operation, if the DeviceNet module cannot verify that a module in the
configuration list is still active in the system, the error code 02, Module Removed, will be
generated. This message may result from an improperly installed module, damaged
connections, or possible internal module damage. Attribute 26 of the DeviceNet interface
object (class 180) points to the location where the module response has ceased. When
investigating this error, be sure to check the connections to the module immediately
preceding the module as well as the module that is directly identified. Loose or damaged
connections in the previous module can cause this error message.
IMPORTANT
Accepting the configuration will cause I/O configuration parameters
to be reset to default values such as input filter times.