| 摘要 |
PURPOSE:To change the communicating text without stopping the communication with an optional timing by storing the text corresponding to the individual communication respectively to the higher order process control system and the lower order process control system, and executing the control as a whole by the process control system. CONSTITUTION:For the timing of the text maintenance, at the time of stationary, the process control system collects the process data stipulated by the text, transmits to the process control system, and the process control system executes the optimum calculation, etc., based on the data, obtains the set point value, transmits to the process control system, and the process control system outputs the received set point to the process. The above-mentioned sequence is repeated. The maintenance of the text is executed at the intervals of the sequence. Namely, by the process control system, the maintenance of the communicating text is executed, the maintenance of the communicating text to send the maintenance communication of the text to the process control system and control by the own system with the process control system is executed and the communicating processing to use the new text is started. |
