JPS56161793A - Remote monitor control device - Google Patents

Abstract

PURPOSE:To prevent multiple selection surely, by making the next cycle for the cycle performing selective switching operation as noncontrol, in a system of remote monitor control of the 1st and 2nd groups in time sharing one transmission cycle. CONSTITUTION:If the control item is >=100 and <=200, for example, a master station 101 checks a signal 17 obtained from the items of control item numbers 1-100 at a multiplex selection detecting circuit 3, and if it is not multiplex, it is input to a constant mark encoder 5. Next, an output 41 of an encoder 5 is input to a comparison circuit 31 constituting a multiplex selection preventing circuit 13, and it is compares with a signal 42 via a buffer register 30, and when the selective switching is detected, a lock signal 43 is fed to a gate circuit 34 from a lock circuit 36 to clock it for cnoncontrol. As to the control items 101-200, the similar processing is made to switch a gate circuit 35. If the gate circuits 34, 35 are not locked, a slave station 102 is controlled in time sharing manner via a parallel serial converter 7.