Can you help me with this batch mix lab simulation?

pipoyz07

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Sep 2011
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Exercise #1 -- Filling the Batch Mixing Tank

  • From the Simulations Menu at the top of the screen, Select the Batch Mixing Simulation.
    bl1-430x170.gif
    Using your knowledge of PLC counters, design a program to meet the following requirements:
    • When the Start switch (I:1/0) is pressed, pump P1 will be energized and the tank will start to fill. The pulses generated by Flowmeter 1 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 control panels FULL light is to be energized.
    • The filling operation is to halt immediately if the stop switch is pressed.
    • While testing, utilize the "Reset Simulation" and the "Reset Timers and Counters" entries in the Simulations menu to re-start your program.
    To make it a little easier to see what is happening with the counter, you might want to add the following rung to the end of your program.
    bl2-468x96.gif
    If correctly entered, the TOD (To BCD) instruction will take the integer value in the counters accumulator, convert it to Binary Coded Decimal, and then move (copy) this BCD value to the control panel LED display (O:4). The TOD instruction can be located in the Compute/Math group of instructions in the Edit Panel. Be sure to alter the Source entry to match the counter number you are using.
Exercise #2 -- Emptying the Batch Mix Tank

  • Modify your program so that it meets the following additional requirements:
    • The mixer will run for 8 seconds once the tank is full.
    • When the mixing is complete, drain pump P3 is to be started and the tank is to be drained. Flowmeter 3 will be employed to decrement the existing counter, and draining will be allowed to continue till the counters accumulator reaches zero.
    • Once the tank is empty again, pressing the Start switch will cause the sequence to repeat.

Exercise #3 -- 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 the Start switch.
    • 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.
 
We don't mind helping, but as your post states "Excercise"
which means homework. As with many others the answer is always the same.
We will gladly help you, but you first must help yourself by putting forth an effort and doing the work. then post any questions along with yout work attached and we will review it and offer suggestions.

regards,
james
 
Pi,
Yes, I can help you. Your first task is to add the first rung to your LogixPro program. Actually, I wil show you the first 3 rungs, so you do not get off to a bad start.

When the Start switch (I:1/0) is pressed, pump P1 will be energized and the tank will start to fill. The pulses generated by Flowmeter 1 should be used to increment a counter.
Click to expand...

Piboyz Batch Mix R0.jpg
 
help with exercise 2?

I know this is an old post, but I was hoping for a little advice for exercise 2. I was able to get it to work the way it should, but my instructor told me I have to find another way besides using an equal comparator. I am supposed to use only counters. Where I have been struggling is to find another way besides that to stop the count down counter when the accumulator reaches 0 for the drain flowmeter. Any help is appreciated.
 
Welcome to the forum! It is usually better to start a new thread, rather than asking a new question on an old. Otherwise, you'll elicit answers to questions that are not your own, wasting everyone's time.

To your question: counters not only have integer values (accumulators and presets), but they also have bits like enable, done, count up and count down. Perhaps using one of these instead of an EQU might do what you need.

Research how counters work and how they manage their bits.
 
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