Rockwell Automation 1395 Multi-Comm Hardware/Software - Manual (Page 89)

6 Chapter
6–1
Troubleshooting
Chapter Objectives
This section describes the MCA board fault diagnostics and how they are
processed by the 1395 Drive. Using the MCA Fault Board messages will
help you to isolate problem areas and initiate possible solutions.
WARNING: Only qualified personnel familiar with the 1395
Drive system should perform troubleshooting or maintenance
functions on the MCA Board. Failure to comply may result in
personal injury and/or equipment damage. All precautions
detailed in the 1395 Instruction Manual troubleshooting section
must be followed when attempting to diagnose MCA board
malfunctions.
The MCA Board provides initial fault handling based on conditions within
it’s environment, and then signals the Bulletin 1395 which provides further
disposition based on system requirements. Faults are divided into three
categories:
Hard Faults
Hard Faults are non-recoverable and are the highest priority fault. That is,
the Bulletin 1395 must either be RESET or POWER-CYCLED after the
fault condition is corrected. The MCA Board transmits its fault to the
Main Control Board through the dual-port RAM as explained in the
Bulletin 1395 Instruction Manual. A Hard Fault in an adapter is designed
to initiate an ECOAST Stop Sequence (Refer to the 1395 Manual for an
in-depth explanation). The following examples are considered Hard
Faults:
S Internal RAM malfunction
S EPROM Checksum error
Soft Faults
Soft Faults occur when an Adapter Board detects a condition which may
result in undesirable operation. Soft Faults differ from Hard Faults in that
the 1395 Drive can (in most cases) maintain proper control during a Soft
Fault condition. The Adapter takes appropriate action within its domain to
guard against degradation of Drive performance and signals the condition
to the 1395 Drive. In addition, the fault may be cleared and normal
operation resumed at the point the fault occurred. Examples of Soft Faults
are:
S Incorrect protocal DIP switch settings
S Illegal baud rate