| 摘要 |
PURPOSE:To make possible the announcement of which interlock contact operates by providing state memory devices for respective electric power detectors and indicators to indicate the stored states thereof. CONSTITUTION:The outputs from AC-DC converters AD1-AD3 maintain an L level and flip-flops F1-F3 maintain a reset state when a limit switch LS3 of a control device 100 breaks. Indicators L1-L3 are kept lighted up. The outputs of the converters AD4-Ad6 of which the inputs are cut off from the R phase rise to the H level and the outputs of the flip-flops F4-F6 maintain the L level. Transistors TR4-TR6 are cut off and the indicators L4-L6 are put out. The operator knows the interlock of the switch LS3 corresponding to the indicator L4 from the above-mentioned state. There is therefore no need for disposing supervisory personnel at all times and the detection of the interlock operation is made possible.
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