Switch supervision device, control system and control method

摘要

A control system has an instruction path of which an object section connects a microcomputer, a switch and a switch supervisory device with one another. The switch sets the path in conductive or non-conductive state on the low side of the microcomputer. An instruction signal is sent to the microcomputer through the conductive path to set the microcomputer in an operation state. When the device judges based on the operation state of the microcomputer that the switch has set the path in a conductive state, the device sends a first signal of first voltage, causing the signal to have current strength equal to or higher than predetermined value in the path, to the object section. When the device judges that the switch has set the path in a non-conductive state, the device sends a second signal of second voltage lower than first voltage to the object section.

主权项

1. A switch supervisory device connected to an instruction path that connects a microcomputer for controlling a controlled object with a switch used to set the instruction path in a conductive state or a non-conductive state, the microcomputer operating in an operation state including a normal operation state and a waiting state, an instruction signal being sent to the microcomputer through the instruction path during the conductive state so as to change the operating state of the microcomputer to the normal operation state from the waiting state, the device comprising:
a path judging block that judges, based on the operation state of the microcomputer, whether or not the switch has set the instruction path in the conductive state, the path judging block being structured so as to judge in response to the operation state of the microcomputer that the switch has set the instruction path in the conductive state; and a signal sending block that
sends a first signal set at a first voltage, causing the first signal to have a first current strength equal to or higher than a predetermined value in the instruction path, to the instruction path when the path judging block judges that the switch has set the instruction path in the conductive state, whereby the first voltage is applied to the switch, andsends a second signal, set at a second voltage lower than the first voltage, to the instruction path when the path judging block judges that the switch has set the instruction path in the non-conductive state, whereby the second voltage is applied to the switch.