Hardware reference guide

DIO
35013379 02 October 2007 261
LED Indicators
and Descriptons
The following figure shows the LED panel.
The following table shows the DIO LED indicators and descriptions.
LED Descriptions
LEDS Color Indication when On
Ready Green The module has passed power-up diagnostics.
Fault Red A communications error exists between the DIO module and one or
more I/O modules, or an output module is not being written to, over the
Modbus Plus network.
Pwr ok Green Bus power is present.
Modbus + Green Communications are active on the Modbus Plus port.
Error A Red Communication error on the Modbus Plus Channel A (dual cable only).
Error B Red Communication error on the Modbus Plus Channel B (dual cable only).
Ready
Error B
Modbus +
Error A
Fault
Pwr ok
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