Basic work of PLC diagram is introduced

PLC is the basic work of sequential user program, execute one instruction per clock cycle. Execution of user programs generally has two kinds of circular scanning and timing scan, the scanning process is divided into three stages, namely the input sampling stage, program execution stage and output refresh stage, as shown in figure 1. ( 1) The input sampling stage. PLC in the input sampling stage to order scanning way people read all input terminal of the state, save people input register, and then into the program execution stage. ( 2) Program execution stage. PLC in the stage of the program execution order to scan each instruction. People just read from the input registers all the input terminals of the state. Figure PLC controller program execution ( 3) The output refresh stage. After all the instruction execution, will all the output state to the output circuit in the output register, become the real output of PLC controller. PLC controller performed the above three stages is called a scan cycle.
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