AH500 Hardware and Operation Manual 
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4.1  AH500 Hardware Framework 
4.1.1  Component Parts of AH500 Hardware 
A complete AH500 system consists of a main backplane, extension backplanes, power supply modules, a 
CPU module, I/O modules, and extension cables. The basic AH500 system is illustrated below. 
 
4.1.1.1  Necessary Components 
A complete AH500 system consists of the following four necessary components. 
 
  Main backplane 
A CPU module and other modules are installed on a main backplane which provides the function of 
connecting buses. The main backplanes are divided into four types according to the number of I/O 
modules installed on the main backplanes. These four types are four-slot main backplanes, six-slot main 
backplanes, eight-slot main backplanes, and twelve-slot main backplanes. Besides, a CPU module 
installed on a main backplane can be replaced by a RTU module on a control network. Please notice that 
there is at least one CPU module on a control network.
 
 
POWER CPU
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7