Lesson Plan:

Programmable Logic Controller Basics

Date:

Mar 28-Apr 1, 2005

Course No.:

EET3370

Week:

4

Unit:

Unit 2 – Programmable Logic Controllers

Instructor:

Prof. Powers

 

Objectives:

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

·         Describe the components of a typical PLC.

·         Describe the memory structure of a PLC.

·         Explain the terms rack and I/O group.

·         Determine the number of words required for the I/O tables given the number of inputs or outputs.

·         Describe the PLC scanning cycle.

·         Use the XIO, XIC, and OTE instructions.

·         Configure a ladder diagram to comply with PLC restrictions.

·         Properly address inputs, outputs, and internal bits.

·         Write and enter ladder logic.

 

 

Content Outline:

Monday, 3/28/05

Unit 1 Test (Chapter 12 and 1st two sections of Chapter 14)

Wednesday, 3/20/05

Programmable Logic Controllers (PLCs)
            PLC Components
            Addressing

Friday, 4/1/05

Programmable Logic Controllers (PLCs)
            Bit Level Instructions

Lab:  31 Mar or 1 Apr

4 – Introduction to Programming and Editing

 

 

Reading:

·         Read Chapter 14.

 

 

Assignment:

·         Week 4 Homework:  Q14-3, Q14-6 through Q14-11, and Problem on reverse.

Show your work for all questions requiring calculations.

 

 

Evaluation:

·         Week 3 Homework due 28 March.

·         Unit 1 Test – 28 March (on Chapter 12 and 1st two sections of Chapter 14).

·         Lab 4 due 31 March or 1 April.

·         Week 4 Homework due 4 April.

 

 

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 4 Homework Problems (continued)

 

 

1.  The figure below shows a ladder diagram for a heater-blower system that uses a thermostat
to control the operation of the blower.  In particular, the blower does not come on until the
heater has heated up and it remains on until the heater has cooled down. 

 

It is desired to have an SLC 5/04 PLC control the system and replace as much hardware as possible.  Assume the PLC has an 8 terminal Input module in slot 1 and an 8 terminal Output module in slot 2.

 

Make a drawing similar in format to figure 14-5 in the text.  Specifically:

 

a)  Draw the required inputs and outputs.

 

b)  Draw the PLC ladder diagram (software program) showing the addresses for all devices.

 

 

                             Figure 1