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Design a plc program control prosim-ii door.

  1. Mar 10, 2013 #1
    1. The problem statement, all variables and given/known data

    In this exercise we want you to apply your knowledge of Relay Logic Instructions to
    design a program which will control the ProSim-II Door. The Door System includes a
    Reversible Motor, a pair of Limit Switches and a Control Panel, all connected to your
    PLC. The program you create will monitor and control this equipment while adhering to
    the following criteria:

    In this exercise the Open and Close pushbuttons will be used to control the
    movement of the door. Movement will not be maintained when either switch is
    released, and therefore the Stop switch is neither required nor used in this
    exercise. However, all other available Inputs and Outputs are employed in this
    exercise.

    Pressing the Open Switch will cause the door to move upwards (open) if not
    already fully open. The opening operation will continue as long as the switch is
    held down. If the switch is released, or if limit switch LS1 opens, the door
    movement will halt immediately.

    Pressing the Close Switch will cause the door to move down (close) if not already
    fully closed. The closing operation will continue as long as the switch is held
    down. If the switch is released, or if limit switch LS2 closes, the door movement
    will halt immediately.

    If the Door is already fully opened, Pressing the Open Switch will Not energize the
    motor.

    If the Door is already fully closed, Pressing the Close Switch will Not energize the
    motor.

    Under no circumstance will both motor windings be energized at the same time.

    The Open Lamp will be illuminated if the door is in the Fully Open position.

    The Shut Lamp will be illuminated if the door is in the Fully Closed position.


    2. Relevant equations



    3. The attempt at a solution
     
    Last edited: Mar 10, 2013
  2. jcsd
  3. Mar 10, 2013 #2

    lewando

    User Avatar
    Gold Member

    Not sure what you are expecting. You need to attach a flowchart or pseudocode or a state diagram or your PLC code or some other attempt at a solution to get help.
     
    Last edited: Mar 10, 2013
  4. Mar 10, 2013 #3
    Identify the number of inputs and outputs for the PLC.
    Allocate inputs and outputs to match PLC specification. (Normally inputs have numbers like 0.10 or Slot 0, channel 0 and other combinations for outputs, these vary between Makes and models)
    Next your job is to convert the above mentioned conditions into 'logic' diagram or ladder logic. Most PLCs use ladder, though some of them may under stand Function block(like Flow chart) or structured text (similar to high level programming language like C)
    Few hints: Open or close push buttons are normally open contacts - inputs. You will have to use momentary contact in the ladder.
    The motor will operate when the corresponding contactor or relay picks up. (Up or down contactor) This means the PLC output operates the corresponding contactor.
    Generally the limit switches are normally closed (to keep the circuit fail safe), there are limit switches available to make them work they way you want.
    Good luck.
     
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