AH500 Hardware and Operation Manual 
2-94 
  AH04HC-5A 
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04HC
CN1
ERROR
RUN
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2 
RUN LED indicator 
(green) 
Operating status of the module 
ON: The module is running. 
OFF: The module stops running. 
3 
ERROR LED indicator 
(red) 
Error status of the module 
Blinking: The module is abnormal. 
Providing the mini USB communication interface 
Connecting the module and an I/O extension cable 
Connecting the module and a backplane