Hardware reference guide

CPU Modules
35013379 02 October 2007 177
LED Indicators
and Descriptions
The following figure shows the LED indicators.
The following table provides a description of the LED indicators for the
140CPU43412A module.
LEDS Color Indication when On
Ready Green The CPU has passed power-up diagnostics.
Run Green The CPU has been started and is solving logic.
Bat Low Red The battery needs replacing or is not present.
Modbus Green Communications are active on the Modbus port 1 or 2.
Modbus + Green Communications are active on the Modbus Plus port.
Error A Red Indicates communications error on the Modbus Plus port.
Mem Prt Amber Memory is write-protected (the memory protect switch is on).
Ready
Run
Modbus
Error A
Mem Prt
Modbus +
Bat low
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