9. Data Processing Design Examples 9.5 ANS/ANR - Level Monitoring Alarm System Y0 X1 Y1 X0 Control Purpose: z Monitoring the water level of an aquaculture farm by alarm and indicator system. When the level is below the lower bound for 2 minutes, the alarm and the indicator will be ON. At the same time, the water feeding valve will start working until the level is back to normal range. Devices: Control Program: M1000 M1049 M1048 will be valid o nly if M1049 = ON. X0 When X0 = ON for more than 2 minutes, the alarm S900 will be ON and latched. X1 ANRP When X1 = ON, the alarm will be reset. M1048 Y0 When M1048 = ON, the alarm indicator will be ON, and the water feeding valve will be enabled.
Y1 Program Description: z When the level is below the lower bound (X0 = ON) for 2 minutes, Y0 and Y1 will be ON. The alarm indicator will be ON and the water feeding valve will be enabled. z When the level reaches normal range (X1 = ON), Y0 and Y1 will be OFF. The alarm will be reset. DVP-PLC Application Examples 9-7 Device Function X0 Level lower bound sensor X1 Normal level sensor Y0 Alarm indicator Y1 Water feeding valve ANS T0 K1200 S900