The working principle of the programmable logic controller and the computer is consistent basically, finish the task through the application in brief the expression of manager. But the PC and the programmable logic controller is different in the working , the PC’s working is waiting for the order, for example, the keyboard’s scan and I/O’s scan, the program enter the subprogram when the keyboard is pressed or I/O receive the signal . the programmable logic controller is special machine after it is login the special program, it is working in the scan cycle ,the manager and execute of system is finished in the scan cycle.
The programmable logic controller configuration is multiplicity, but it is the same as basic principle in the control processor , the configuration working does depend the hardware , even more the software. It is the new industrial computer well and truly. The programmable logic controller configuration is hardware and software. It is the same in the hardware, composed of the CPU . RAM. ROM. Input or output of I/O. the power, the programmer . Software is multiplicity programme, composed of system’ programme and consumer programme.
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