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Lab 8 Part A: PLC Fundamentals with

MicroLogix 1100/1400

Presenter: Peter BellMicroLogix and PanelView Component Regional Product Manager

Please DO NOT take this manual!


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PLC Fundamentals with MicroLogix 1100/1400

Contents

Before you begin......................................................................................................................................... 5

About this lab ................................................................................................................................................5

Tools & prerequisites .................................................................................................................................... 5

Lab A1 Creating a New Project............................................................................................................... 7

Launching RSLogix Micro Programming Software....................................................................................... 7

Creating a New Controller Project ................................................................................................................7

Examining Your New RSLogix Micro Project................................................................................................9

Creating the First Rung of Ladder Logic ..................................................................................................... 10

Creating the second ladder logic rung ........................................................................................................ 16

Creating the third ladder logic rung.............................................................................................................22

Verifying your ladder logic program ............................................................................................................22

Saving your work......................................................................................................................................... 24

Lab A2 Testing Your Ladder Logic ......................................................................................................25

Power cycle your MicroLogix 1100/1400 demonstration box ..................................................................... 25

Downloading your ladder logic to the PLC.................................................................................................. 25

Changing the PLC from Program to Run mode.......................................................................................... 29

Monitoring and testing your PLC ladder program....................................................................................... 30

Lab A3 Using Basic Instructions in Ladder Logic.............................................................................. 32

Changing the PLC from Run to Program mode ..........................................................................................32

Copy and Rename your previous ladder logic program ............................................................................. 32

Modifying your existing ladder logic program.............................................................................................. 33

Adding a timer to your ladder logic program............................................................................................... 35


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Adding a counter to your ladder logic program...........................................................................................36

Adding a Limit instruction to your ladder logic program.............................................................................. 38

Adding rung comments to your ladder logic program.................................................................................39

Saving your work......................................................................................................................................... 40

Changing the PLC from Program to Run mode.......................................................................................... 41

Testing and monitoring your completed PLC ladder logic program............................................................ 41

Demonstration Box Button Description for this Lab............................................................................. 44

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Before you begin

Before you begin this Hands-On Lab, please be sure to close any applications that are currently running.

For this lab you will need to complete all sections in order, because each section builds upon the previous

section.

About this lab

This session provides you with an opportunity to explore the basics of programmable logic control using a

MicroLogix 1100 or MicroLogix 1400 PLC. The following sections explain what youll be doing in this lab

session, and what you will need to do to complete the hands-on exercises.

Tools & prerequisites

You have the following materials that will allow you to complete the labs in this workbook.

(1) 1763-L16BWA MicroLogix 1100 (10 DC Inputs / 06 relay outputs, 120 VAC power)

OR

(1) 1766-L32BWA MicroLogix 1400 (20 DC Inputs / 12 relay outputs, 120 VAC power)

(1) Ethernet Switch

(10) Pushbuttons Labeled DI0 through DI9

(6) Lights Labeled DO0 through D05

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RSLogix Micro programming software v8.10 (CPR9)

RSLinx Classic v2.54 (CPR9)

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Lab A1 Creating a New Project

In this lab, we will introduce you to the basics of programming a PLC using the MicroLogix 1100 or

MicroLogix 1400 controller and RSLogix Micro programming software. You will:

Create a new project

Write 3 rungs of ladder logic to start and stop a simulated motor

Save your project to the hard drive of the PC

Download this project to the MicroLogix controller at your lab station

Monitor and Test your program on-line with the MicroLogix controller

Launching RSLogix Micro Programming Software

In this section of the lab, you will launch the RSLogix Micro software, which will allow you to program yourMicroLogix controller.

1. From the Windows start menu, selectStart > Program s > Rockwel l Softw are > RSLogix Micro

Engl ish > RSLogix Micro Engl ishas shown below:

Creating a New Controller Project

In this portion of the lab, you will create an offline project for your MicroLogix 1100/1400 controller.

1. Maximize RSLogix Micro by clicking the maximize Icon in the upper right hand corner ofthe RSLogix Micro window.

2. From the toolbar menu, select File > New,or click on the New Fileicon, to create a new controllerfile.

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3. Enter the Processor Name as M-LAB1 as shown below.

4. Using the down arrow or mouse click, select the MicroL ogix 1100 Series Bor MicroL ogix 1400Series A controller.

At this time you do not need to make any changes to the communicationssettings

5. Once you have selected your controller all that is left is to click OK.

6. From the toolbar menu, select File > Save As and then click Saveas shown below.

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7. If the following prompt appears, click Yesto replace the file.

Examining Your New RSLogix Micro Project

In this section of the lab, you will use the following display to review the RSLogix Micro programming

environment.

A: Project Viewer

Controller information/setup = Series Revision, Configuration Information

Program Files - Where ladder logic is entered

Data Files - Where data values are stored

Force Files - Where you can override the state of the I/O with a forced value, so an input that is

turned on by an external sensor may be forced off even when the sensor is turned on. Or a relay

output may be forced on, even when the program running in the controller did not turn it on.

Custom Data Monitors = User Configurable Data monitor registers, which allows a user to manipulate

user program information (beyond the scope of this course)

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B: Program Viewer

Where Programs reside

Where ladder logic is entered

C: Program TABS

When a program file is open a TAB is created

Allows easy/quick access to program file content

D: Instruction Buttons

Drag & Drop, or Double Click

Must have Program Viewer Active

E: Tabbed Toolbar

Instructions grouped by function.

Floating Toolbar Support

Creating the First Rung of Ladder Logic

1. Verify that the ladder editor in RSLogix Micro is active by clicking in the white space below:

2. Click on the Usertab.

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3. Locate the New Rungbutton.

4. Click and hold the New Rungwith the left mouse button and dragthe icon to rung zero (0000).

5. When you see the green X on rung zero release the left mouse button.

Rungs can be thought of as the means to get current from the left rail to theright rail. In simple relay ladder diagrams, wires did exactly that.

6. Verify that your RSLogix Micro program window appears as shown below.

The lower case e to the left of the ladder logic indicates the rung is in editmode.

Our empty rung represents a dead short, so we need to add the conditions that definewhen we want current to flow, or actions to take place. We will start by adding an inputinstruction to our blank ladder rung. An input instruction gives the controller information thatit interprets as the cause component of cause and effect. Given the proper inputs(causes) the controller will generate specific outputs (effects).

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7. Click on the Bittab to show the bit level instructions.

8. Click on the Examine if Closed ( XIC ) instruction and drag the instruction to your new rung.

9. When you see the green X, release the mouse button.

The XIC instruction eXamines if an Input is Closed (a.k.a. normally opencontact).

We now need to provide an address for our new XIC input. The address tells the ladderlogic where to look for the input. PLCs use addressing where Relay Logic (or hard-wiredlogic) used the physical connection of wires to make a circuit.

If at anytime you wish to delete a rung or instruction from your program simplyselect the rung or instruction (Highlight it red) and press the delete key on yourkeyboard or right mouse click and select delete.

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10. Make sure your XIC instruction is highlighted, type I:0/0and press Enter.

11. When the description window appears, enter the description as shown below and click on OK.

Adding a description is not required; however, it is good practice for programdocumentation and for future troubleshooting. This will allow you to later readyour program, and understand it much more easily.

12. Verify that your ladder rung appears as follows:

Now let us add an output instruction to this rung. This represents the effect, as discussed earlier.

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13. From the Bi t tab, click and drag an OutpuT Energize OTEinstruction to the rung as shownbelow. As before, when you see the green X release the mouse button.

Again we need to provide an address for our new OTE output.

14. Make sure the OTE instruction is highlighted, type O:0/0and press Enter.

There is a difference between the letter O (which stands for Output), and thenumber 0.

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15. Enter a description as shown below and then click on OK.

16. Verify that your ladder rung appears as follows:

If your addresses do not look the same, make sure that you are properly usingthe letter O and the number 0.

Congratu lat ions yo u have just created your f i rst run g of ladder logic!

When the conditions on the input (left) side of a rung are met, the instruction on the output (right) side of

the rung will be executed. In this case, the OTE instruction will be executed whenever the XIC instruction

is evaluated as true. In other words, when the input (InputButton0) is closed or turned on at address

I:0/0 the result will be the output (Light0 on the controller) will be turned on at address O:0/0.

The inputs and outputs in your ladder logic can be physical, real outputs like the relay output shown

above, or can be virtual or a bit stored in the data table. You use physical outputs for controlling external

devices but you may want to create virtual outputs to identify when something turns on or off other parts

of your ladder logic program.

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Creating the second ladder logic rung

We need to start a new rung. So lets insert a new rung into our program. You can do this either by the

method we used in the previous section (Click/Drag) or you can try another method:

1. Select rung 1 (0001) and simply press the Insertkey on your keyboard.

You will now see a new empty rung in your ladder logic program as shown below.

Lets add the first input instruction to this new rung just as you did in the previous section.

2. Click and Drag an XIOinstruction to rung 1 until you see the green X, then release your mouse

button.

The XIO instruction eXamines if an Input is Open (a.k.a. a normally closedcontact).

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3. With the newly added XIO highlighted, enter the address I:0/1 and then pressEnter.

4. Add a description as shown below and click OK.

When finished, your rung should appear as follows:

Lets add a second input instruction on rung 1.

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5. Click and drag an XIC instruction (eXamine If Closed) down to rung 1, to the right of our XIO

instruction, until you see the green X, then release your mouse button.

6. Using what you learned in the previous steps, address this new instruction as I:0/2 and add a

description of StartButton. When finished your rung should now look like this.

Putting serial conditions on the rung allows us to look for AND conditions. Inthis case we are asking if the Stop Button is not pressed AND the Start Button ispressed. Both conditions have to be true for the rung to be true.

7. Add an OTEinstruction (OutpuT Energize) to rung 1 and address it as O:0/1. Add a description

of Motor1 so that your rung appears as follows:

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Now lets add a Branch to rung 1.

Branches allow for either / or programming. For example, we would usebranched rungs if we wanted to indicate that eitherPushbutton 1 orPushbutton 2could be used to turn on an output.

8. Click on the Usertab and then click and hold the left mouse button to drag the Rung Branch

button in between the XIO (StopButton) and the XIC (StartButton) instructions on rung 1.

9. When you see the green X as shown below, release the mouse button.

10. Verify that your rung appears as follows:

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We must now identify what the either / or decision will be. To do this, we need to move the branch

around our Start Button.

11. Click and hold on the right side of the branch leg (the part highlighted red). Drag the branch leg to the

right side of the Start Button. When you see the green X, release the mouse button.

Your rung should now appear as follows:

We now need to add an input instruction on our branch.

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12. Using what you learned in the previous steps, click and drag an XIConto the new branch you just

created and address the new XIC as O:0/1.

Your completed rung should appear as follows:

You will notice you are entering the same address for this XIC instruction as theoutput address of your OTE instruction. This is the power of the PLC. What youhave just accomplished is the PLC equivalent to auxiliary contacts on a motorstarter that allow you to create a Seal In circuit. By adding this branch with theOTE address the motor will now stay on when the start button is released, untilthe stop button is pressed.

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Creating the third ladder logic rung

1. Using what youve learned so far, add another rung as shown below.

Verifying your ladder logic program

Program validation or a verification, checks the program you have written for errors. After verification is

completed the Resultswindow will open and gives you information about mistakes or omissions that may

have been found as your program logic was inspected by the software.

There are two types of program verification. The first one verifies the file you are currently working in and

only this file. The second verifies all files (Main and Subroutines) for the project you created. Because our

program only resides in File #2 we will use the first program verification method.

1. Click on the Veri fy Fi lebutton as shown below:

When the verify has completed and no errors are found all program edit markers (the e to the left of

the ladder rungs) will disappear and no errors found will be displayed at the bottom of the RSLogix

Micro software screen.

2. If no errors are identified in your logic program proceed to the next section Saving Your Work.

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3. If you have errors in your logic program, those rungs containing the errors will still show the edit

markers (the small e beside the rung number) as shown below:

4. If the Verify Results window doesnt open automatically, select View > Resultsfrom the toolbar menu

or simply press ALT+1.

5. Click on the error message in the Veri fy Resultswindow and you will notice RSLogix Micro highlights

the ladder rung and instruction that contains the error.

6. Go back through the previous lab and correct your error(s).

Common errors are using letters instead of numbers such as ( O instead of 0 )

7. After correcting your error(s) verify your file again.

8. Once all errors are fixed proceed to the next section Saving Your Work.

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Saving your work

Your project is still not stored on your computers hard drive. Save your program to prevent your work

from being lost.

1. Click on the Savebutton or from the toolbar menu select File > Save.

2. If the Revision Note box appears, click OK.

The revision note box will appear. RSLogix 500 software is automaticallyconfigured to allow you to enter notes on version changes of your program andback-up older versions of your program as you make changes. This allows you toquickly go back to an older version if you make a mistake. The number ofrevision copies is configurable and can be turned off if you do not desire to have

this feature active.

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Lab A2 Testing Your Ladder Logic

Power cycle your MicroLogix 1100/1400 demonstration box

1. Switch the demo box power switch off (O) for several seconds and then back on again (1). This

will reload a default ladder program from the memory module into the MicroLogix 1100/1400.

Downloading your ladder logic to the PLC

1. From the RSLogix Micro toolbar menu, select. Comms > System Comms.

2. Expand the AB_ETHIP-1driver by clicking on the +sign in front of the driver.

3. Highlight the MicroLogix 1100 or 1400 at 192.168.1.2 as shown below:

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4. Click Download.If the revision note window appears simply clickOK.

5. You will be asked to confirm the download clickYES

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6. You may then be prompted to replace the controllers communications settings with your new project

settings. Simply clickYES.

7. If the controller is currently in remote RUN mode and executing a program the following screen will

appear asking to switch the controller to the remote PROGram mode to begin the download. Simply

clickYES.

The MicroLogix 1100/1400 controller has a mode switch that is accessible usingthe LCD display and buttons located on the controller. The software is able to

change the controllers mode only when the controller is in the remote RUN orPROGram mode. If the Mode Switch on a MicroLogix 1100/1400 controller is inthe Run position or the Program position, the software program will not be able tochange the operating mode.

You will see the download progress window appear as the download occurs.

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****************************************IMPORTANT******************************************************

8. You may be prompted to apply communications channel changes if your program settings are

different then what is configured in the Micrologix. Since we made no changes to how the MicroLogix1100/1400 communicates, if this screen appears, simply click Dont Apply.

****************************************IMPORTANT******************************************************

9. Just click OKif you get the following message:

10. If your controller was in the RUN mode prior to the download RSLogix 500 will ask if you wish to

switch the controller back into the RUN mode. Click NO. We will manually switch into the RUN mode

in a later step.

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11. You will then be asked if you wish to Go Online with your controller. ClickYES.

Changing the PLC from Program to Run mode

1. Click on the down arrow next to REMOTE PROGas shown below:

Notice there are three (3) Run selections for the PLC:

Runscans the program and outputs are enabled

Test Cont inuou sscans the program and the outputs are disabled

Test Single Scanperforms one scan cycle with outputs disabled

2. Click Run.

3. When asked Are you sure you want to change processor mode to RUN? click Yes.

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Monitoring and testing your PLC ladder program

With the PLC now in Remote Run, you can monitor or edit data within the controller. This allows you to

make program debugging changes and change data variables while in the run mode.

You can also use the LCD display of the MicroLogix 1100/1400 to see I/O status as well as other

attributes of the controller. See example below.

Ethernet Status

COMM1

Output Status

ControllerMode(it may alsosayREMOTEmeaningRemoteRUN)

Input Status

So now lets examine your ladder logic in operation. (If needed, you may refer to the button location at the

end of this lab document)

When green bars are shown on either side of ladder logic elements this indicates Logical Continuity,

which helps determine how the application is operating and is designed to help you in debugging your

application ladder logic. In a relay logic model, this is the same as current flowing.

1. To test rung 0, enable (Press and hold) InputButton0 (DI0) on the demonstration box, examine thedisplay of your MicroLogix controller and rung 0 in your RSLogix 500 project.

2. Light0 (DO0) will turn ON and in your ladder program you see InputButton0 and Light0 highlight

indicating that the input switch and output have been turned on. Also notice on the LCD display that

Output 0 is also turned on.

3. To test rung 1, press and release (ON then OFF) StartButton (DI2). Motor1 (DO1) will illuminate onthe demonstration box. Notice StartButton and Motor1 in your MicroLogix 1100/1400 program is

also highlighted indicating an energized or on condition.

Inputs and Outputs are numbered 0,1,2, etc. This means that address I:0/2 isactually the third button on the demonstration box.

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Notice that even after you release StartButton, Motor1 continues to stay on. The logic decision

between StartButton and Motor1 in our input circuit is an OR. If either StartButton is pressed, or

Motor1 is energized, Motor1 will stay running. This is a perfect example of a latching circuit also

called a 3-wire control circuit. If you toggle StopButton (DI1) on the demonstration box, you will see

that Motor1 will de-energize or turn off.

The two inputs on rung 2 are the outputs of rungs 0 and 1. RunningLight will energize (Turn On)

when the two inputs are true. So in other words, the outputs from rung 0 and rung 1 must be ON or

TRUE to turn on our RunningLight. This is an example of AND ladder logic.

Go ahead, give it a try - turn on your RunningLight.

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Lab A3 Using Basic Instructions in Ladder Logic

We are now going to take your program from Lab #2, modify two rungs, and create some new program

logic. We are also going to program a timer and counter in our program to see how they can be used to

provide unique control capabilities. The last thing we will do is program a Limit command. The limit

command is one of several powerful comparison instructions available in a PLC controller.

One capability that the MicroLogix 1100/1400 shares with larger Allen-Bradley programmable controllers

is online editing capability. This is the ability to make changes to the ladder logic while online with the

controller, even while the controller is in RUN mode!

Changing the PLC from Run to Program mode

1. Click on the down arrow next to REMOTE RUNand select Program.

2. ClickYeswhen asked if you want to change the processor mode to PROGRAM.

Copy and Rename your previous ladder logic program

1. From the toolbar menu, select File > Save Asto create a copy of your program.

2. Type the File name M-LAB3 as shown below and then click Save. Select Yes to Replace existing

File? if the file already exists.

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3. ClickYeswhen prompted with the following:

Modifying your existing ladder logic program

First, let us add an XIO Instruction to rung 1.

1. Since we are still online, you must double click on rung number, 0001, in order to put it into edit

mode. The es by the rung indicates that it is now in edit mode. Notice that a duplicate of the rung

appears just below it with rs by it (for replace):

2. Click on the Usertab.

3. Click, hold and drag the XIO to the location between the branch and the OTE (remember when

you see a green box, release the mouse button).

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4. With the XIO instruction highlighted type C5:0/DN and then press Enter.

5. When asked to enter a description, type CounterDoneBi t and press OK.

6. Click on the rung number, 0001, and then click on the Accept Current Rung Edi tscheckmark:

7. The es will disappear and your modified ladder logic should appear as shown below:

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Now, lets Modify the first XICinstruction on rung 2.

8. Double click on the rung number, 0002, to put it into edit mode and then double click the first XIC

instruction in rung 2.

This will open the text edit box for the instruction.

9. Type T4:0/DN and press Enter.

This will overwrite the existing address.

This is one of the most powerful features of a micro controller, the ability tochange the operation of a program through software. To do the same thing in

relay logic, an electrician would have to disconnect the wire from a normally opencontact (our InputButton0 in rung 0) and wire it to the done or output of a timer.Besides avoiding the obvious potential for miss-wiring and the time it would taketo do the wiring, the micro controller has the benefit that the timer is already builtin.

10. When asked to enter a description, type Timer done bi t and click OK.

11. Verify that your rung now appears as follows:

12. To accept the changes, click on the rung number, 0002, and then click on the Accept Current Rung

Editscheckmark, as before. The es by rung 0002 should disappear.

Adding a timer to your ladder logic program

1. Click, hold and drag the New Rungbutton over 0003. Remember, with rung 0003 selected, you can

also simply press the Insert key to add a new rung as rung 0003.

2. Click, hold and Drag the XICbutton onto the left side of the rung you just created.

3. With the instruction highlighted, type O:0/1 and Enter.

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Notice as soon as you entered the address O:0/1 the description Motor1 wasautomatically shown. Once an address has a description associated with it, thatdescription is carried throughout your ladder logic program.

Your rung should now look like this

Now lets add the Timer Instruction.

4. Click on the Timer/Countertab near the top of the RSLogix 500 software.

5. Click, hold and drag theTON(Timer ON delay) onto the right side of the rung you just created.

Remember when you see the green x this indicates a valid location for you to place the instruction.

6. Enter the following parameters for the timer. Double-click on the Timer parameter in the TON

instruction.

Timer: T4:0 This is the address of the timer. Press Enter

Description: Motor On/Off Timer. Click OK

Time Base: 1.0 This is the increment that the timer counts, 1 second per count. Press Enter

Preset: 10 This is the value the timer must reach to be done. Press Enter

Accum: 0 This is the elapsed time of the timer while counting. Press Enter

Your rung should now look like this:



Adding a counter to your ladder logic program

Using what you have learned so far, add a new rung 0004.

1. Add a XIConto the left side of the rung you just created.

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2. Address the instruction as O:0/1 and then press Enter.


3. Click on the Timer/Countertab.

4. Click, hold and drag the CTU(CounT Up) onto the right side of the rung you just created.

5. Enter the following parameters for the counter. Double click on the Counter parameter in the Counter

instruction:

Counter: C5:0 This is the address of the counter. Press Enter

Description: Motor On/Off Cycle Counter. Click OK

Preset: 10 This is the value the counter must reach to be done. Press Enter

Accum: 0 This is the number of counts that the counter has recorded so far. Press Enter


6. To accept the changes, click on the rung number, 0004, and then click on the Accept Current RungEditscheckmark, as before. The es by rung 0004 should disappear.

Now we need to add an instruction so we can reset our counter.

7. Add a new rung(rung 0005).

8. Add a XICbutton onto the left side of the rung you just created.

9. Address the instruction as I:0/3 and then press Enter.

10. Enter the description Motor On/Off Counter Reset Bu tton and click OK.

11. Click on the Timer/Countertab and drag the RESbutton onto the right side of the rung you just

created (this instruction will allow us to reset our counter).

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12. The address we will use for our RES instruction is C5:0.

Your rung should now appear as follows:

The function of the RES or reset instruction in our program is to zero out theaccumulator of our C5:0 counter whenever I:0/3 is energized.



Adding a Limit instruction to your ladder logic program

1. Add a new rung(rung 0006).

2. Click on the Comparetab and drag the LIM(Limit instruction) onto the left side of the rung you just

created.

The LIM instruction will allow us to compare the value of our timer againstpredetermined limits.

3. Enter the following parameters for the LIM by double-clicking on each parameter in the Limit

instruction:

Low Limit: 1 This is the low limit we will use for our comparison. Press Enter

Test: T4:0.ACC This is the value we will be evaluating; If asked to enter a description simply

leave it blank and click OK

High Limit: 7 This is the high limit we will use for our comparison. Press Enter

The LIM instruction is true when the timer is between 1 and 7 seconds. Thequestion marks will disappear when you accept the rung edits.

Lets now add an output instruction to our LIM rung.

4. Click on the B ittab and drag the OTEbutton over to the right side of the LIM rung you just created.

5. Address the instruction as O:0/4and press Enter.

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6. Following our good programming practices, label your new output address Motor Starting Light.




Adding rung comments to your ladder logic program

1. Right click on rung 0006and select Edi t Comm ent.

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2. Select File/Rung and type the description While the timer accumulator is between 1 and 7 seconds,

the LIMit instruction will turn output #4, the 'Motor Starting Pilot Light' ON.

3. Click OKto accept your changes.

Rung Comments can be used to describe in detail the function of a rung of ladderlogic. This is a good programming practice, and a great feature of RSLogix 500programming software.


Saving your work

1. Click on the Savebutton.

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2. Click OKfor Revision Note box.

3. ClickYesto the Warning! About Data Table changes.

Changing the PLC from Program to Run mode

1. Click on the down arrow next to REMOTE PROG.

2. Select Run and then click Yeswhen the following window appears.

Testing and monitoring your completed PLC ladder logic program

Using the buttons and watching the lights does your program work the way you expect? (If needed, youmay refer to the button location at the end of this lab document)

Lets examine your ladder logic in operation.

1. RUNG 0 -Enable DI0 on the demonstration box and DO0 will illuminate. Examine the LCD of your

MicroLogix controller and you will see Input 0 turn on. In your ladder program you will see

InputButton0 and Light0 highlight indicating that the input button and output have been turned on. If

you turn off InputButton0 then Light0 will turn off.

2. RUNG 1 -Watching your ladder logic carefully, Press and release (ON then OFF) StartButton or DI2

on the demonstration box. Notice Motor1 turns on. Also notice that on rung 3 the timer begins to time

because its input condition Motor1 has been turned on and the counter has incremented by one

count.

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Even after you release DI2 StartButton the motor continues to stay on and the timer continues to

time. This is a perfect example of a latching circuit also called a 3-wire control circuit. Toggle

StopButton DI1 on the demonstration box. You now see that Motor1 turns off and the timer stops

timing.

3. RUNG 2The two inputs on rung 2 are the T4:0 done bit and Motor1. The output RunningLight is a

condition of these two inputs. In order for our RunningLight to turn on the timer needs to time for 10

seconds and be done and Motor1 must be on. Only then will RunningLight or DO3 on thedemonstration box turn ON. So once the motor has been running for at least 10 seconds the

Running Pilot Light will come on.

4. RUNG 3- In order for our Motor On/Off Timer the TON to start timing Motor1 must be on. The

Timer starts timing once the motor begins running up to speed.

5. RUNG 4- Each time Motor1 is toggled from Off to On our Motor On/Off Cycle Counter the CTU will

count up by one. This will allow us to keep track of how many times our motor has been turned on

and off. This will help us to schedule maintenance appropriately.

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6. RUNG 5-When Motor On/Off Counter Reset Button our counter reset switch is energized this will

reset counter C5:0 back to 0 . When we perform maintenance on the motor, we can reset the counter

to keep track of the next maintenance cycle.

7. RUNG 6- While our Motor On/Off timer accumulator is between 1 and 7 seconds, the LIMit

instruction will energize our Motor Starting Light and illuminate DO4 on our demonstration box. This

gives us the indication that the motor is spinning up to speed. DO4 then turns off after 7 seconds to

conserve the use of our pilot light.

8. Close RSLogix Micro.

CONGRATULATIONS!!

YOU HAVE JUST COMPLETED

THE BASICS OF PLCs

HANDS ON LAB

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Demonstration Box Button Description for this Lab

StopButton

StartButton

Motor On/Off CounterReset Button

InputButton0

Light0 Motor Starting Light

Motor1 Running Light

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