PLURAL CHANNEL SYSTEM WHEREIN THE INPUT SIGNALS ARE UNALTERED IF WITHIN STANDARD LIMITS, BUT ARE AVERAGED, IF OUTSIDE LIMITS

摘要

A control apparatus has redundant input signals from which an output signal is produced. In part it comprises three inputs to which the respective input signals are applied and three outputs. There are three resistors of known value with each connecting a respective input and a respective output. There are six resistance devices each connecting a respective input with one of the remaining outputs between which there is not one of the resistors. The resistance devices comprise a voltage sensitive double-pole whose resistance substantially equals said known value below a selected threshold voltage but which becomes very great above said threshold voltage. The threshold voltage is selected to be sufficiently greater than the normal input voltage to represent a malfunction situation.