A production control system includes a terminal server and a manufacturing execution server. The terminal server is configured to transmit a control message. The manufacturing execution server is configured to receive the control message through a first communications protocol and a second communications protocol and to execute a first application module and a second application module according to the control message. The terminal server judges whether a quantity of the control message is greater than a predetermined value; if the quantity of the control message is judged to be greater than the predetermined value, then the terminal server transmits the control message through the first communications protocol; and if the quantity of the control message is judged to be less than or equal to the predetermined value, then the terminal server transmits the control message through the second communications protocol.