PURPOSE: To return the state of a condition setting switch group to the state for the start of maintenance work at the time of the end of maintenance and inspection work of an electronic device by providing the condition setting switch group, a state output circuit, and a state storage device.
CONSTITUTION: At the time of the start of maintenance and inspection work, a trigger signal is generated by a write start circuit 4 to start a write drive circuit 5, and states of switches of a condition setting switch group 1 are written and stored in a state storage device 3 as a digital output signal encoded by a state output circuit 2. Thereafter, the maintenance and inspection work is started. At this time, the state of each switch of the switch group 1 is inputted from the circuit 2 to one input terminal of a collating circuit 7 and is compared with the latch signal from a read switch circuit 6, and abnormality is displayed out on a display device 9 through an OR circuit 8 when collation results in disaccord. Consequently, the switch group is checked again when it is detected that the switch group 1 has switches which are not returned to the initial state, and stored contents of the device 3 are cleared by a reset circuit 10 when the display of abnormality disappears.
ANZAI MASAHIRO
HIRATA YOSHIYA
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