Omni 4000 Series Installation Manual page 165

Abnormal
Heartbeat light is steady Heartbeat light flashing blue
illuminated (DS1)
Heartbeat light is not
illuminated
If an external DT module Activity will be shown on the
is in use and no activity CAN STATUS LEDs
on the CAN STATUS
LEDs
Red status LED on the Status indicators for each 10
active I/O point I/O points may be on, off, or
flashing.
Page 7-6
OMNI 4000/7000 Installation Guide – Rev H
Digital I/O Multiplexer
Normal Possible Causes
The firmware for the DM module is not
running or corrupted
DM module is not powered
DT module communication link not
connected correctly
An overcurrent condition overloaded the
fuse, tripping it
Troubleshooting
Suggested Action
Replace DM Module with a spare.
•
Check the system power.
•
Verify that the flow computer is
powered on.
•
If problem persist, replace DM
Module with a spare.
•
Verify wiring is connected according
to the project specific drawings
•
Verify that the DT Module is
powered, operating, and the
heartbeat LED is flashing
•
Remove condition that is causing
the overload. The fuse will
automatically reset.
•
Remove the wire associated with
the point.
−
The PTC over current
protection for the I\O point will
reset.
−
Verify that the LED is green.
•
Review the circuit associated with
the I/O point.
•
If the red LED does not clear after
removing the wire, then reset the
system.
•
If problem persist, replace DM
Module with a spare.