| 摘要 |
PURPOSE:To attain decentralization of functions of hierarchy form by providing a mutual signal transmission function between a controller and a center terminal to a field terminal in each remote terminal and providing a data transmission function between said remote terminal and the center terminal. CONSTITUTION:The remote terminals are connected in a loop by an optical cable 1 and an optional part of the loop is connected to the center terminal CT through the optical cable 1. Each field terminal FT, a controller C and a center terminal ST constitute a plant integrally. The remote terminal RT has a function coding information in the hierarchy such as shipping amount, kind of oil and collation of reservation and transmitting and receiving it with the center terminal CT, and further a remote terminal dividing the function of the plant to a proper scale is provided to each plant and has a mutual signal transmission function between the controller C and the sensor group. Moreover, an ordering voice signal is superimposed to provide the mutual communication function in or between the hierarchies. |
