AH500 Hardware Manual 2.1 AH500 Hardware Framework 2.1.1 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. 7 backplanes ｝ ． ． ． ． ． ． 2.1.1.1 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. 2-2 POWER CPU I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7