ARTICLE INFO ABSTRACT Article history: The manufacturing equipmenton most shop floorsconsists of numerical control machines,and the condition of each piece of equipment is monitored and controlled by an internal sensor or programmable logic controller (PLC). To control and monitorproduction lines that consist of an equipmentor production module, a separate control and monitoring system such as a manufacturingexecution systemshould be introduced. However, there is no standardized system, and it

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... s costly and difficult to build a system for small or medium-sized plants. In this paper, a PLC-based supervisory system for operation control of a group of production machines is proposed, and the developed PLC-based system is evaluated by applying it to a computer numerical control machine.