PLC in the working process of nc machine tools

PLC controller in the working process of nc machine tools, and usually the PLC controller working process is basically consistent, divided into the following steps: ( 1) 。 Input sampling: input sampling, is the way of PLC with sequential scan read all input port state of signal, and the state, in the image into the input register. Cycle of the program is run, of course, these signals status will not change, unless the arrival of a new scan cycle, and the original port signal state has changed, and read the input image register signal state will change. ( 2) , program execution: will the program execution phase system in a specific order of scanning, and at the same time reading input image hosting area, the output image hosting area read related data, after the related operations, will result in the output image hosting area for the use of output, and the next operation. ( 3) , refresh phase: in the instruction execution is completed, all the state of the output relay output image hosting area ( On/off) In the output refresh stage to the output latch, output by a specific way, drive the external load.
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