| 摘要 |
PURPOSE:To eliminate the discordance of working between two central processors by continuing the working of a timer without resetting the timer immediately after the timer is once started even though the electric power is temporarily reduced less than a reference level. CONSTITUTION:The electric power sent from a power generator 12 is supplied to the analog input device 4 of a sequencer 1 containing two central processors 7 and 8 via a current transformer 11, a transformer 10 and a power converter 9. The electric power which changes with the lapse of time is compared with a reference level at both processors 7 and 8 respectively. The value of a counter is increased in case said electric power is larger than the reference level and the count value of an internal counter is smaller than a prescribed level and then set at the upper limit level when the count value of the internal counter is larger than the prescribed level. While the value of the counter is reduced in case the electric power is less than the reference level and the count value is not set at zero. Finally a timer is started if the final count value of the counter is larger than another prescribed level. Otherwise the above-mentioned comparison is repeated after the timer is reset. |
