Application Exercise 6 Washing Machine[1]

8/11/2019 Application Exercise 6 Washing Machine[1]

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Department of Engineering and Design- Room T405PLC Application Exercises

Supervisors: Mr.K.Rotter/ Mr.S.Mondal Authors: Mr.M.Zahir / Mr.P.Adams

Application Exercise 6. Washing Machine Simulator

This Module is a Washing machine simulator.

The module has all the necessary programming

buttons/switches(9 inputs) to simulate the

operation of a domestic washing machine. The

aim of this exercise is to program the simulator

in ladder logic to carry out a washing cycle set

by the inputs and activate the corresponding

LEDs to indicate that the washing cycle is active.

The students are advised to work out and write

down the operation of machine in plain English

first before attempting to develop a ladder logic

program. This exercise requires the use of

internal Relays(for Start, Tub Full, Tub Half Full)and a sequencer to carry out the washing cycle.

The Vibration sensor Button and/or the Door

Lock switch can be used to terminate the cycle

or simulate the Vibration that may occur if a machine is over-loaded.

The table below shows the connection of the Inputs and Outputs to the module. You

are advised to use the same names given below for Inputs and outputs and insert

them in the I/O table.

Function Output LEDs PLC Output Function Switch/Button PLC Input

Start 1 StartBTN 1

HotTemp 2 HalfLoadSW 2

TepidTemp 3 SpinSW 3

ColdTemp 4 CoolWashSW 4

SlowFwd 5 HotWashSW 5

SlowRev 6 TubFullBTN 6

FastFwdSpin 7 TubHalfFullBTN 7

PumpON 8 DoorClosedSW 8

TubFilling 9 VibrationBTN 9

TubFull 10

TubHalfFull 11

Locked 12

ColdWater 13

HotWater 14

WhereSW,Stands for Switch and BTN,stands for Buttonin the Input Table.


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Washing Cycle Programming

An example Hot Wash Cycle requires the activation of Hot Wash Input. The Tub

Should be filled by pressing the Tub Full Button to latch the condition. Once the Door

is Locked, and the Start button is pressed the Cycle should start by:

Door Locked indicator ON

Start Light ON

Indicate Hot Water Valve ON

Tub Filling ON

After some delay set by the Tub Full Button, Tub Full Indicator ON, Tub Filling

OFF.

HOT Temperature Indicator ON

The Machine Indicates the Slow Reverse/Forward lights Turning ON/OFF in

sequence separated by reasonable delays.After the Cycle is finished the Machine empties the Tub, i.e Pump ON and

goes into Fast Spin if the Spin button is pressed.

All indicators are then switched OFF.

At any time if the Door Lock or the Vibration sensor inputs are activated the

machine should stop.

The machine should indicate the sequence with reasonable delays so that the

cycle is not too long and also not too short so that the sequence can be observed

easily.

Similarly, by pressing or latching the various switches and buttons a different

washing cycle should be performed.

Note: The entire ladder logic should be Simulated first before transferring

the program to the PLC.


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How to transfer programs to the PLC

This section describes the step by step procedure for transferring programs to thePLC. It is essential that you carry out the steps given below exactly.

Ensure the PLC is connected to the power supply and switched ONEnsure the power supply of any other Rig connected to the PLC is alsoswitched ON.

Ensure that RS232 Serial cable is connected to the PLCs COM port

Run the TLserver Software if it not already loaded. You will see the followingwindow appear.

Now click on the Serial Port Setup button above. The following window appears:


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Ensure the message COM1 opened at 38400bps is displayed in the Responsewindow. If not please call the Technician in charge to assist you.If the messageconfirms that the port is opened as shown above then, proceed to the next page.

Click on Controllerand select Program transfer to PLC. The following window isopened:

Now type in 01 in the Detect ID box and click on Memorize Username &Passwordto clear the Tick sign. This means the PLC should not be set with ausername and password.

Note: you must not set a Password for any other subsequent experiment or

project. Username can be ignored and left alone as samples.

Therefore the window should appear as shown below before you proceed to the nextstep.


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Now click OK.

Click Yes to Overwrite PLCs program.

The i-Trilogi software will now compile the Ladder logic to machine code. If the codecontains errors, then the PLC will display an error message that the compilation isnot successful. You must then go back to editing and correcting your errors.

If the compilation is successful, you will see the message Success!In theCompilation window shown above.


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Now click on Start Transfer, the following window is displayed:

Click onYesto Reset PLC?

The program in the PLC will Execute and read data from input ports or output data tothe devices you have programmed. The status of the PLC can be monitored by thefollowing:

Click on Controllerand select On-Line Monitoring. The following example windowappears:


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The status of all devices can be monitored from this window. If A/D converters areused then the Raw Data from the converters can be seen at the top of the window inADC1-8 boxes.

This concludes a successful PLC Program transfer. The same procedure is

used to transfer any program to the PLC.

Virtual LCD Display

You may view the Virtual LCD Display to see other status data by clicking on theViewbutton. Click Viewnow. You will see the Virtual LCD display window:

This window is used to output up to 4 lines of text to display messages or values ofGlobal variables. It also displays, the state of the A/D converters 1 to 8 ,PWMoutputs 1 to 8 and the data that is output the D/A channels.

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Application Exercise 6 Washing Machine[1]