Hardware reference guide

CPU Modules
35013379 02 October 2007 131
LED Indicators
and Descriptions
The following figure shows the CPU11303 LED indicators.
The following table shows the CPU11303 LED descriptions.
LED Descriptions
LEDs Color Indication when On
Ready Green The CPU has passed powerup diagnostics.
Run Green The CPU has been started and is solving logic (see the following
table for Run LED error codes).
Modbus Green Communications are active on the Modbus port.
Modbus + Green Communications are active on the Modbus Plus port.
Mem Prt Amber Memory is write protected (the memory protect switch is on).
Bat Low Red The battery needs replacing.
Error A Red Indicates a communications error on the Modbus Plus network.
Ready
Bat Low
Error A
Run
Modbus
Modbus +
Mem Prt
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