Abstract
Through the design of the control system of the four-position electric tool holder, it is known that the modern enterprise cannot complete the automation control without the control of PLC. PLC processes and calculates the I/O of the tool holder to realize the sequential control of the tool holder. It is of great significance to master the control principle of the tool holder, to be familiar with the working process of the tool holder, to encounter the tool holder faults in the working process and to be able to handle simple faults. It has important reference value for the design of PLC control system of NC machine tools.
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