20 ControlLogix DeviceNet Scanner Module
Publication 1756-IN566B-EN-P - April 2001
I/O Status Indicator
This bi-color (green/red) LED indicates the status of the 1756-DNB’s
I/O scanning state. The I/O Status LED informs you whether this
device has outputs under control and whether any outputs or inputs
are active (outputs active, inputs producing, etc.) or faulted. The LED
reflects the mod/state of the inputs and outputs, not necessarily the
on/off condition of the I/O points themselves.
Health (OK) Status Indicator
This bi-color (green/red) LED indicates whether the device has power
and is operating properly.
Condition Indicates
off Scanner is not online. Check network power.
green Scanner is in RUN mode, outputs are under control,
and inputs are being consumed.
flashing
green
(1)
(1)
The flash rate of the LED is approximately 1 flash per second. The LED
should be on for approximately 0.5 seconds and off for approximately 0.5
seconds.
Scanner is in IDLE mode, outputs are not under
control, and inputs are being consumed.
Condition Status Indicates
off no power No power applied to device. Apply chassis power.
Verify module is completely inserted into chassis
and backplane.
green device operational Device is operating normally. The DNB has at least
one connection to it from a controller.
flashing
green
(1)
(1)
The flash rate of the LED is approximately 1 flash per second. The LED should be on for approximately
0.5 seconds and off for approximately 0.5 seconds.
device in standby The device is operating correctly; however, no
controller is controlling it. Verify that the DNB
module is properly configured in the controller’s I/O
configuration.
red unrecoverable fault
or
device self testing
Device has an unrecoverable fault; repair or replace
it, or
Device is in self test during power-up.
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