Patent ID: 7853347

Claim:
A semiconductor manufacturing system comprising: a semiconductor manufacturing apparatus; a first controller for controlling the semiconductor manufacturing apparatus; an auxiliary machine for the semiconductor manufacturing apparatus; a second controller for controlling the auxiliary machine; and a third controller for electrically coupling the first and second controllers, wherein the second controller outputs an auxiliary machine-in-operation signal to the third controller when the auxiliary machine is operating, outputs an auxiliary machine-stopping signal to the third controller when the auxiliary machine is stopping, and operates or stops the auxiliary machine according to an instruction signal received from the third controller, the first controller receives the auxiliary machine-in-operation signal or the auxiliary machine-stopping signal via the third controller, and keeps the semiconductor manufacturing apparatus in operation or on standby when the first controller is receiving the auxiliary machine-in-operation signal, and the third controller stops the auxiliary machine when the third controller detects that the semiconductor manufacturing apparatus is on standby, and outputs the auxiliary machine-in-operation signal, instead of the auxiliary machine-stopping signal received from the second controller, to the first controller.