Allen-Bradley ControlLogix 1756-DMD30, User Manual, Page: 70 / 369

Publication 1756-UM522B-EN-P - February 2003
6-2 Troubleshooting the Drive Module
Use the table on the next page to troubleshoot your module.
LED Indicator Display Means Take this Action
OK Green Connection is running. None
Flashing
Green Inhibited I/O connection. None
Red Non-Recoverable Fault Remove module from
service
Flashing Red Flash download in progress. None
Off Module is powered down. None
DRIVE
FAULT Red Module is faulted. See Fault Status
parameters.
Off No fault is present or module is
powered down. None
LINK
SYNC Green The module is the time master or a
time relay and synchronization is
complete. None
Flashing
Green The module is configured as a time
relay from CST to SynchLink but is not
synchronized with a CST master on
the backplane. N/A
The module is configured as a time
relay from SynchLink to CST but has
not synchronized with the upstream
device. N/A
Flashing Red The module is configured as a CST
master and has detected another CST
master. N/A
The module is configured as a time
master on SynchLink and has
received time information from another
time master on SynchLink. Ensure that only 1 time
master is present and
transmitting time
information on SynchLink.
Off The module is not configured as a
time master or time relay or module is
powered down. None
OS OK Green System and parameter constants
loaded. None
Off Checksum failure. Reflash the module.
DRIVE
COMM
OK Green DPS communication is active and
synchronized. None
Off DPS communication is not active, is
not synchronized, or the module is
powered down. Verify that cables are
securely connected.
LINK
COMM Green The module is configured and
receiving valid data from SynchLink. None
The module is configured and enabled
to only transmit on SynchLink. None
Off The module is configured but not
receiving valid data from SynchLink. Verify that cables are
securely connected.
The module is configured but not
enabled to transmit on SynchLink. Enable module transmitter.
Module is powered down. Power the module.