1 Introduction to the unit
1.1 What this unit is about
1.2 0utcomes
1.3 Unit structure
1.4 How to use these learning materials
1.5 Symbols used in this unit
1.6 0ther resources required
1.7 Assessment information
2 Section 1： Explain and classify PLC hardware
2.1 Introduction to this section
2.2 Assessment information for this section
2.3 Introduction
2.4 The relay
2.5 Hard-wired systems
2.6 The PLC
2.7 Sensors and actuators
2.8 PLC oubsystems
2.9 PLC applications
2.10 Common elements of the PLC
2.11 Basic logic functions
2.12 A short note on contacts
2.13 Example program
2.14 PLC architecture
2.15 PLC failures
2.16 PLC classification
2.17 Program execution
2.18 PLC scan
2.19 Summary of this section
3 Section 2： Describe the operation of PLC software
3.1 Introduction to this section
3.2 Assessment information for this section
3.3 Introduction
3.4 Normally open contact
3.5 Normally closed contact
3.6 Timer
3.7 Counter
3.8 Latch
3.9 Shift registers
3.10 Auxiliary relay （flag）
3.11 Program execution
3.12 Program examples
3.13 Summarv of this section
4 Section 3：Simulating the control of an industrial process using a PLC
5 Answer to SAQs and Activities
6 Glossary
7 Acknowledgements
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