CHANGEOVER DISPLAY DEVICE FOR PLURAL PROGRAMMABLE CONTROLLERS

摘要

PURPOSE:To improve the using efficiency of the titled display device by providing a multiplexer which opens and closes a transmission line with the operation signal of a programmable controller and transfers data between an actuated controller and a CRT terminal equipment. CONSTITUTION:Programmable controllers PC1-PCn decide at the inside a specific one of those switch signals of switches SW1-SWn. When the controller PC1, for example, is actuated, the operation signal is outputted from the PC1 to turn on a lamp L1 forming an operation display matter. Thus the operation of the PC1 can be recognized. Furthermore another operation signal JO is supplied to a multiplexer MPX with operation of the PC1. Thus the MPX decides the specific one of controllers PC1-PCn that delivered the signal JO. Then the transfer of data is performed between a prescribed one of controllers PC1-PCn and a CRT terminal equipment.