FIELD INSTRUMENTATION SYSTEM

摘要

This invention relates to optical multiplex transmission type field instrumentation systems, in which data from a plurality of field devices installed on the side of a field are transmitted in a multiplex mode through optical fiber transmission paths and an optical distributor to a master processor on the side of a panel. For the purpose of forming a field instrumentation system which is greatly rationalized and improved in reliability a N : N optical distributor is provided which branches and couples in the rate of N : N the optical transmission paths, the field controllers and the output signals of the measuring units are applied through the N : N optical distributor to the field controllers thus forming a control loop for the field controllers in the field.