Filling the Batch Mixing Tank
Exit to the Main Menu and select the Batch Mixing
simulation.
Using your knowledge of PLC counters, design a program to
meet the following requirements:
When switch S2 is pressed, pump P1 will be energized and the
tank will start to fill. The pulses generated by flowmeter FL1
should be used to increment a counter.
When the count reaches a value where the tank is approximately
90% full, the pump is to be shut-off and
and the status panel FULL light is to be energized.
The filling operation is to halt immediately if the stop
switch S1 is pressed.
Note: exiting to the main menu and then returning to the batch
mix simulation will clear the tank etc. and allow you to retry
your program.
Emptying the Batch Mix Tank
Modify your program so that:
The mixer will run for 8 seconds once the tank is full.
When the mixer stops, pump P3 is to be started and the tank
is to be drained till the counter's accumalator reaches
zero.
Pressing switch S2 will cause the sequence to repeat.
Continuous Operation
Modify your program so that the filling and emptying sequence
will repeat continuously once it has been started by the initial
pressing of switch S2.
Ensure that the RUN light is energized when the mixer or either
pump is running.
The STANDBY light should light and the process should halt when
the Stop button is pressed.
The process should restart where it left off if the the Start
button is pressed following a Stop.
