Periodic Sequence Control
A simple example where periodic sequence operation of machineries is applied is shown in figures below (A). At first, a solenoid valve G1 opens to let the flow of the liquid ingredient I, from tank T to container N. A calculated pre-set time is allowed to fill the container N at sufficient level poured ingredient. After the pre-set time hase elapsed, the solenoid valve G1 is closed to stop the pouring ingredient 1. Immediately after the solenoid valve G1 is closed, the motor M starts to operate and mix the poured ingredients in container N. Sufficient time is allowed to the mixing process and after which the motor M is de-energized to stop the mixing. Right after the mixing stop, another solenoid valve G2 will open to drain the mixed ingredient in container N. When container N is fully drained, the solenoid valve G2 will close. After the closing of solenoid valve G2, the solenoid valve G1 will open again and the process is repeated. (A) Illustrate a simple process where periodic operat...