Hardware reference guide

CPU Modules
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The following table shows the CPU LED descriptions.
LED Error Codes
The following table shows the run LED error codes for the CPU42402.
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 redundant Modbus Plus
port A (140CPU42402 only).
Error B Red Indicates a communications error on the redundant Modbus Plus
port B (140CPU42402 only).
LED Error Codes
Number of Blinks Code Error
Continuous 0000 requested kernel mode
2 80B ram error during sizing
80C run output active failed
82E MB command handler stack error
3 769 bus grant received
72A not master asic on cpu
72B master config write bad
72C quantum bus DPM write failure
72F plc asic loopback test
730 plc asic BAD_DATA