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GLOBAL TECHNOCRATS AND CONSULTANTS (GTC) LTD PLC TRAINING ROLAND NIWAREEBA CERIANO MBIIKA EPHRAIM MALINGA

Programmable Logic Controls training day 2

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PLC ladder logic training guide

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Page 1: Programmable Logic Controls training day 2

GLOBAL TECHNOCRATS AND CONSULTANTS (GTC) LTD

PLC TRAINING

ROLAND NIWAREEBACERIANO MBIIKA

EPHRAIM MALINGA

Page 2: Programmable Logic Controls training day 2

PLC Training Day 2

Ladder Programming

Page 3: Programmable Logic Controls training day 2

Basics

• Observe the diagram below

Page 4: Programmable Logic Controls training day 2

Other Symbols in Logic Diagrams

Normally Open /Closed Contact

Normally Open/ Closed Coil Timers

Page 5: Programmable Logic Controls training day 2

Normally Open/ Closed Contact

Page 6: Programmable Logic Controls training day 2

Normally Open/ Closed Coil

Page 7: Programmable Logic Controls training day 2

Basic AND & OR Gates

AND Gate OR Gate

Page 8: Programmable Logic Controls training day 2

Conditional Logic

Page 9: Programmable Logic Controls training day 2

Ladder Diagrams

Page 10: Programmable Logic Controls training day 2

Ladder Diagrams

Page 11: Programmable Logic Controls training day 2

Outputs and Latches

• These can be used as conditions for other actions

• For instance, an output can actuate another sequence of events

Page 12: Programmable Logic Controls training day 2

Example

Page 13: Programmable Logic Controls training day 2

Example

Page 14: Programmable Logic Controls training day 2

Exercise

Write a PLC program to implement the conditional logic statements (a), (b) and (c) below.

a) A PLC output is to switch on if any of three inputs is switched on.

b) A PLC output is to switch on if any one of three inputs is switched on but not two or more.

c) A PLC output is to switch on if any two outputs are switched on, but not the third.

Page 15: Programmable Logic Controls training day 2

Exercise

Page 16: Programmable Logic Controls training day 2

Exercise

Page 17: Programmable Logic Controls training day 2

Implementing Latching

• What does the term Latching mean ?

Page 18: Programmable Logic Controls training day 2

Timers

• Timers are used to implement timing functionality in PLCs.

• Most basic use is to introduce delays between processes

Page 19: Programmable Logic Controls training day 2

Timers

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Pulse Generator

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Pulse Generator

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Pulse Generator

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Counters


Programmable Logic Controller

Programmable Logic Controller

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