3. Timer Design Examples 3.6 Artificial Fishpond Water Level Monitoring System (Flashing Circuit) X2 X3 Y0 Y3 Y4 X1 Y1 X4 RESET X0 Y2 Control Purpose: z Feeding or draining water automatically when the water level of artificial fishpond is not at the normal level. In addition to feeding / draining water, enabling the alarm and alarm lamp when the water is above or below the alarm level. z Stopping the alarm when RESET is pressed. X0 500ms Y3/Y4 Alarm Alarm Lamp 500ms Devices: DVP-PLC Application Examples 3-7 4 Device Function X0 X0 = ON when the water is above the lowest level of alarm level. X1 X1 = ON when the water is above the lowest level of normal level.
X2 X2 = ON when the water is above the highest level of normal level. X3 X3 = ON when the water is above the highest level of alarm level. X4 X4 = ON when RESET is pressed. T1 500ms timer. Time base: 100ms. T2 500ms timer. Time base: 100ms. Y0 1# drainage pump Y1 Feeding pump Y2 2# drainage pump Y3 Alarm lamp Y4 Alarm