AH500 Hardware and Operation Manual 
12-62 
12.4
 
Error Codes and LED Indicators 
A.  Columns 
a.  Error code: If the error occurs in the system, the error code is generated. 
b.  Description: The description of the error 
c.  CPU status: If the error occurs, the CPU stops running, keeps running, or in the status defined by 
users. 
 Stop: The CPU stops running when the error occurs. 
 Continue: The CPU keeps running when the error occurs. 
 Self-defined: The status of the CPU can be defined by users. Please refer to section 8.2.1 in this 
manual for more information.   
d.  LED indicator status: If the error occurs, the LED indicator is ON, OFF, or blinks. 
 ERROR: The system error 
 BUS FAULT: The I/O bus error 
 Module ERROR: The module error 
 
  LED indicators 
CPU 
ERROR 
The status of the CPU 
ON: A serious error occurs in the system. 
OFF: The system is normal. 
Blinking: A slight error occurs in the system. 
BUS FAULT 
The status of the I/O bus 
ON: A serious error occurs in the I/O bus. 
OFF: The I/O bus is normal. 
Blinking: A slight error occurs in the I/O bus. 
Module  ERROR 
The status of the module 
ON: A serious error occurs in the module. 
OFF: The module is normal. 
Blinking: A slight error occurs in the module.