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Abstract

A power supply controller with a function to identify whether or not a signal that was output is reliable and to perform the necessary processing on the input side when an unreliable signal was sent that might adversely affect the input side in communication systems. A controller 1 and a controlled device 21 are connected at both ends of a cable 17 (27) with connectors. The controller contains a first processing system 1, a second processing system 2, and a comparator 7. The first processing system and the second processing system 2 are for example equivalent to microcomputers, etc. The comparator 7 compares the outputs of these two processors and generates a match/mismatch signal according to whether the outputs are a match or not. When the two outputs are a match then the outputs of these processors are reliable. However if the outputs are a mismatch then it signifies there is an error in one of these processing systems. Either of these processors outputs a general output signal separate from the match/mismatch signal. The general output signal may be output from either the first processing system or the second processing system without passing through the comparator. The general output signal is converted to a contact signal. The match/mismatch signal functions to turn the monitor signal on the monitor signal line on and off. The actual connection for this (output signal line) is shown in the drawings. The monitor signal line forms a loop on the monitor signal line for the signal to move back and forth between the controller and the controlled device. The controlled device contains an internal open-identifier for sensing whether the control signal line is open or closed.

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First Claim