CPU module, is the core of PLC, plays the role of the nerve center, each PLC has at least one CPU, control the whole system work, by which to read instructions, interpret instructions and execute instructions.
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The CPU module in PLC is actually the microprocessor, due to the high degree of integration of the circuit, the detailed analysis of the internal CPU is no longer necessary, we only need to find out its function in the PLC, can use it correctly is enough.
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The external performance of the CPU module is the display of its working state, the interface and the setting or control switch. Generally speaking, there are various status indicators on the CPU module, such as power display, operation display, fault display and so on.
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In addition to the display, the CPU module has a variety of bus interfaces for connecting the I\/O module or the baseboard, such as the memory interface for installing the memory card and the communication port for communication.
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On the CPU module, there are many setting switches to set the PLC, such as setting the PLC working mode, memory area, etc.