Programmable Logic Controllers

by PETRUZELLA

• ISBN13: 9780078298523
• ISBN10: 0078298520
• Edition: 3rd
• Format: Hardcover
• Copyright: 2004-03-02
• Publisher: Career Education

Summary

Now in four-color, this outstanding text for the first course in programmable logic controllers (PLCs) focuses on how PLCs work and gives students practical information about installing, programming, and maintaining PLC systems. It's not intended to replace manufacturer's or user's manuals, but rather complements and expands on the information contained in these materials. All topics are covered in small segments. Students systematically carry out a wide range of generic programming exercises and assignments. All of the information about PLCs has been updated.

Table of Contents

Preface	viii
Programmable Logic Controllers (PLCs): An Overview	2	(18)
Programmable Logic Controllers	4	(2)
Parts of a PLC	6	(4)
Principles of Operation	10	(2)
Modifying the Operation	12	(1)
PLCs versus Computers	13	(1)
PLC Size and Application	14	(6)
Review Questions	17	(2)
Problems	19	(1)
PLC Hardware Components	20	(30)
The I/O Section	22	(4)
Discrete I/O Modules	26	(6)
Analog I/O Modules	32	(1)
Special I/O Modules	33	(1)
I/O Specifications	34	(2)
The CPU	36	(2)
Memory Design	38	(2)
Memory Types	40	(2)
Programming Devices	42	(1)
Recording and Retrieving Data	43	(1)
PLC Workstations	44	(6)
Review Questions	46	(3)
Problems	49	(1)
Number Systems and Codes	50	(20)
Decimal System	52	(1)
Binary System	52	(3)
Negative Numbers	55	(1)
Octal System	55	(2)
Hexadecimal System	57	(1)
BCD System	58	(2)
Gray Code	60	(1)
ASCII Code	61	(1)
Parity Bit	61	(2)
Binary Arithmetic	63	(7)
Review Questions	66	(3)
Problems	69	(1)
Fundamentals of Logic	70	(22)
The Binary Concept	72	(1)
AND, OR, and NOT Functions	72	(4)
Boolean Algebra	76	(3)
Developing Circuits from Boolean Expressions	79	(1)
Producing the Boolean Equation from a Given Circuit	79	(1)
Hardwired Logic versus Programmed Logic	80	(6)
Programming Word-Level Logic Instructions	86	(6)
Review Questions	88	(1)
Problems	89	(3)
Basics of PLC Programming	92	(36)
Processor Memory Organization	94	(8)
Program Scan	102	(3)
PLC Programming Languages	105	(4)
Relay-Type Instructions	109	(3)
Instruction Addressing	112	(1)
Branch Instructions	113	(3)
Internal Relay Instructions	116	(1)
Programming EXAMINE IF CLOSED and EXAMINE IF OPEN Instructions	117	(1)
Entering the Ladder Diagram	118	(4)
Modes of Operation	122	(6)
Review Questions	124	(2)
Problems	126	(2)
Developing Fundamental PLC Wiring Diagrams and Ladder Logic Programs	128	(42)
Electromagnetic Control Relays	130	(1)
Contactors	131	(2)
Motor Starters	133	(1)
Manually Operated Switches	134	(2)
Mechanically Operated Switches	136	(2)
Transducers and Sensors	138	(12)
Output Control Devices	150	(3)
Seal-In Circuits	153	(1)
Latching Relays	153	(3)
Converting Relay Schematics into PLC Ladder Programs	156	(4)
Writing a Ladder Logic Program Directly from a Narrative Description	160	(10)
Review Questions	164	(2)
Problems	166	(4)
Programming Timers	170	(32)
Mechanical Timing Relay	172	(1)
Timer Instructions	173	(3)
On-Delay Timer Instruction	176	(6)
Off-Delay Timer Instruction	182	(2)
Retentive Timer	184	(4)
Cascading Timers	188	(14)
Review Questions	194	(1)
Problems	195	(7)
Programming Counters	202	(34)
Counter Instructions	204	(2)
Up-Counter	206	(8)
Down-Counter	214	(4)
Cascading Counters	218	(2)
Incremental Encoder-Counter Applications	220	(2)
Combining Counter and Timer Functions	222	(14)
Review Questions	228	(1)
Problems	229	(7)
Program Control Instructions	236	(30)
Master Control Reset Instruction	238	(3)
Jump Instructions and Subroutines	241	(7)
Immediate Input and Immediate Output Instructions	248	(3)
Forcing External I/O Addresses	251	(3)
Safety Circuitry	254	(3)
Selectable Timed Interrupt	257	(1)
Fault Routine	258	(1)
Temporary End Instruction	259	(7)
Review Questions	260	(2)
Problems	262	(4)
Data Manipulation Instructions	266	(36)
Data Manipulation	268	(1)
Data Transfer Operations	269	(11)
Data Compare Instructions	280	(5)
Data Manipulation Programs	285	(3)
Numerical Data I/O Interfaces	288	(4)
Set-Point Control	292	(10)
Review Questions	296	(2)
Problems	298	(4)
Math Instructions	302	(20)
Math Instructions	304	(1)
Addition Instruction	305	(1)
Subtraction Instruction	305	(2)
Multiplication Instruction	307	(2)
Division Instruction	309	(2)
Other Word-Level Math Instructions	311	(3)
File Arithmetic Operations	314	(8)
Review Questions	316	(2)
Problems	318	(4)
Sequencer and Shift Register Instructions	322	(32)
Mechanical Sequencers	324	(2)
Sequencer Instructions	326	(5)
Sequencer Programs	331	(7)
Shift Registers	338	(7)
Word Shift Registers	345	(9)
Review Questions	350	(1)
Problems	351	(3)
PLC Installation Practices, Editing, and Troubleshooting	354	(26)
PLC Enclosures	356	(1)
Electrical Noise	357	(1)
Leaky Inputs and Outputs	358	(1)
Grounding	359	(2)
Voltage Variations and Surges	361	(1)
Program Editing	362	(1)
Programming and Monitoring	363	(2)
Preventive Maintenance	365	(1)
Troubleshooting	366	(6)
Connecting Your Personal Computer and Your Programmable Logic Controller	372	(8)
Review Questions	376	(1)
Problems	377	(3)
Process Control and Data Acquisition Systems	380	(26)
Types of Processes	382	(4)
Structure of Control Systems	386	(3)
Controllers	389	(8)
Data Acquisition Systems	397	(9)
Review Questions	404	(1)
Problems	405	(1)
Computer-Controlled Machines and Processes	406	(30)
Computer Fundamentals	408	(7)
Computer-Integrated Manufacturing	415	(2)
Data Communications	417	(9)
Computer Numerical Control	426	(3)
Robotics	429	(7)
Review Questions	434	(1)
Problems	435	(1)
Glossary	436	(17)
Index	453