3. Timer Design Examples 3.10 Automatic Liquids Mixing Control System START X0 X1 Y0 ( A Liquid Inlet ） X10 EMERGENCY STOP STOP X2 Y1( ) Liquid B Inlet Y3 X1 Y2(Mixture Outlet） Control Purpose: z Automatically infusing the container with liquids A and B in order when START is pressed. When it reaches the set level, mix the two liquids evenly then open the valve to let out the mixture. Devices: DVP-PLC Application Examples 3-15 Device Function X0 X0 = ON when START is pressed. X1 Low level float sensor. X1 = ON when the liquid level reaches X1. X2 High level float sensor. X2 = ON when the liquid level reaches X2. X10 EMERGENCY STOP button. X10 = ON when the button is pressed. T0 60 sec timer.
Time base: 100ms T1 120 sec timer. Time base: 100ms Y0 Liquid A inlet Y1 Liquid B inlet Y2 Mixture outlet Y3 Agitator