Lesson Plan:

Programmable Logic Controller Basics

Date:

April 11-15, 2005

Course No.:

EET3370

Week:

6

Unit:

Unit 2 – Programmable Logic Controllers

Instructor:

Prof. Powers

 

Objectives:

Upon completion of this unit, you will be able to:

·         Describe the operation of PLC counter instructions, including Up-Counter (CTU) and Down-Counter (CTD).

·         Analyze and interpret typical PLC timer and counter ladder logic diagrams.

·         Apply combinations of counters and timers to control systems.

·         Program the control of outputs using timer and counter instruction control bits.

·         Interpret & explain information associated with PLC sequencer input & output instructions.

·         Compare the operation of an event driven and time driven sequencer.

 

 

Content Outline:

Monday, 4/11/05

Programmable Logic Controllers (PLCs)
            Counters

Wednesday, 4/13/05

Programmable Logic Controllers (PLCs)
            Sequencers

Friday, 4/15/05

Programmable Logic Controllers (PLCs)
            Program Control Instructions

Lab:  14 or 15 April

6 – Timer Circuits

7 – SLC500 Sequencers

 

 

Reading:

·         Read Chapter 14.

 

 

Assignment:

·         Week 6 Homework:  See reverse.

Show your work for all questions requiring calculations.

·         Lab 6:  Complete and submit per the lab handout.

·         Lab 7:  Complete and submit per the lab handout.

·         Lab 7 Extra Credit:  Implement your design for the week 6 homework assignment on the SLC-500 lab trainer.

 

 

Evaluation:

·         Week 5 Homework due 11 April.

·         Lab 6 due 14 or 15 April.

·         Week 6 Homework due 18 April.

·         Lab 7 & Extra Credit due 21 or 22 April.

·         Unit 2 Test – 22 April (comprehensive).

 

 

Note:

·         Labs will be performed in teams of two or individually until further notice.

·         Demonstrate proper operation of the above experiments to your instructor.

 

 

Resources:

·         Skvarenina, Tim and DeWitt, William, Electrical Power and Controls, 2nd Edition, Prentice-Hill, 2004

·         RSLogix 500 Getting Results Guide, Rockwell Software, 2002 (Results Guide),
available from http://www.tech.mtu.edu/courses/eet3370/index.htm.

·         http://www.tech.mtu.edu/courses/eet3370/index.htm

·         http://www.radideo.com/mtu/index.htm

·         Instructor at mnpowers@mtu.edu and 906-487-2638.

 

Week 6 Homework Problem

 

 

 

 

Task:                           Design a ladder program for the A/B SLC-500 to simulate the operation
of a cylinder system.

 

                                    For extra credit, demonstrate the operation of your program in lab.

 

 

 

Requirements:            Using whatever PLC sequencer instruction you are most familiar with; develop a program that will operate the cylinders in the desired sequence.  The time between each step is to be 3 seconds.  The desired sequence of operation is as follows:

 

·        All cylinders to retract.

·        Cylinder 1 advance.

·        Cylinder 1 retract and cylinder 3 advance.

·        Cylinder 2 advance and cylinder 5 advance.

·        Cylinder 4 advance and cylinder 2 retract.

·        Cylinder 3 retract and cylinder 5 retract.

·        Cylinder 6 advance and cylinder 4 retract.

·        Cylinder 6 to retract,

·        Sequence to repeat.