Rockwell Automation 1395 ControlNet Communication Board - Manual (Page 65)

Chapter
6
Publication 1395.5.37 – March, 1999
Troubleshooting
Chapter Objectives This section describes the CNA board fault diagnostics and how they
are processed by the 1395 Drive. Using the CNA Fault Board
messages will help you to isolate problem areas and initiate possible
solutions.
ATTENTION: Only qualified personnel familiar with the 1395
Drive system should perform troubleshooting or maintenance
functions on the CNA 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 CNA board
malfunctions.
ATTENTION: When performing any troubleshooting on a 1395
Drive equipped with a ControlNet adapter board make certain to
check the Network Update Time (NUT). A NUT less than 5ms
may cause data transfers to (and from) the drive to become
non–deterministic.
The CNA Board provides initial fault handling based on conditions
within its 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 CNA 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 example is
considered a Hard Fault:
S Plug Failure
Internal diagnostics within the plug indicated a malfunction that
rendered the plug inoperable.
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,