14
ControlLogix TTL Input Module
Publication
1756-IN584B-EN-P - August 2003
Check the Indicators
The indicators show individual I/O status (yellow) for each point and
a bi-colored LED for module "OK" (red/green).
During power up, an indicator test is done and the following occurs:
•
"OK" indicator turns red for 1 second and then turns to
flashing green if it has passed the self-test.
•
I/O status indicators turn ON for a maximum of 2 seconds and
then turn OFF.
This completes installation of the module. Use the following
information to remove the module, if necessary.
Indicator:
Displaying: Means:
Take this action:
OK
Steady green
light
The inputs are being multicast
and in normal operating state.
None
OK
Flashing
green light
The module has passed
internal diagnostics but is not
multicasting inputs.
Configure the module with
RSLogix 5000 programming
software.
OK
Flashing red
light
Previously established
communication has timed out.
Check controller and chassis
communication.
OK
Steady red
light
An unrecoverable error has
occurred on the module.
Replace the module.
I/O State
Yellow
The input is active.
None
20945-M
DC INPUT
ST 0 1 2 3 4 5 6 7
ST 8 9 10 11 12 13 14 15
O
K