| 摘要 |
PURPOSE:To promptly detect control system abnormalities by sending out transmission signals between prescribed time intervals during normal operation of a control part. CONSTITUTION:The control system 100 has an each control part with respect to a master part MS 10, an in-panel remote part IRS 20, a front remote part FRS 30 and a rear remote part PRS 40. If a micro-CPU 11 of the MS 10 is normal, the transmission necessarily carried out each time the maximum time lapses, a transmission signal serial output part 11b becomes necessarily 'L' for one bit time, the output of a comparator 11b is kept at 'L'. When abnormalities occur at the CPU 11 and the output 11b is kept at 'H', the output of a comparator 4b goes 'H' so that the output of a OR circuit 5 goes 'H' to be an abnormality detection signal.
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