| The advancement of Science and technology today, demand a right working system. Conventional control system slowly has been left behind and changed into auomatic control system. Using a controler that control the neccessary operational system. This thesis explain about the designing of control system of welding using Programmable Logic Controller (PLC). Creating the control circuit controllers, control circuit that controls the motion of the arm welding and power supply circuit that serves to provide energy supply to drive the mechanical system drive carrier arc welding. The type of PLC that used is Omron CPM 1A |