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This eBook describe the PLC (programmable logic controller) with the special focus on IEC 61131-3 language, that the most programmable controller and also microcontroller accept. The development of the examples is done here with the FREE Version of the tool  CoDeSys (Controller Development System).

 (*) SPS = PLC

 (*) Taste = button

 

As a example we will develop a controller for a rotary disc in a automation line that has also a safety door.

We will start with the language FBD and than all other languages like LD, IL, ST and SFC will be described.

From chapter to chapter the example will be expanded step by step. At the end the language CFC will be shortly described.

The example will be developed and simulated with the FREE-version tool CoDeSys (Controller Development System). You do not need the tool obligatory because the most action in the tool will be shown in films and animations. With some films, the tool CoDeSys is explained.

(*) This eBook is a translation from the German language and there fore you will find in some film and animation German words like SPS = PLC

Content

 
What is a PLC?

 Introduction
 Program
 Cyclic execution
 Advantages and disadvantages
 PLC-Hardware
 PLC central computer and networks
 Rotating a rotary-table

 The norm IEC 61131-3

 Why a norm?
 The 5 programming languages
 Software structure
 Configuration
 LD-language

 LD

 Hardware wiring
 Structure of the PLC program
 Start new project (example 001)
 PLC_PRG
 Add LD-object to the project
 Programming LD-object
 LD-elements
 Networks
 Variables
 Add LD-objects in PLC_PRG
 Start and simulate a project
 Visualisation methods
 Integrated visualisation
 Visualisation of switch and button
 Load the program in a PLC-hardware
 Switcher, opener and negating relay
 Elementary logical connections
 HELP
 LD can not everything!

 FBD

 Introduction
 Boolean algebra and Statecharts
 Truth table and Boolean function
 The LD example in FBD (example 003)
 Transfer LD in FBD and vice versa
 Edge detection (example 004)
 Standard library
 Edge detection with LD and FBD (example 005)
 Set and reset without self-locking circuit (example 006)
 Flip-Flops
 Set and reset in FBD (example 007)
 Rotary table with safety door
 Rotary table and safety door (example 008)
 Emergency-stop (example 009)
 Two-hand-control with timer
 Timer
 Two-hand-control example
 Local and global variables
 Complexity is rising!

 SFC

 Introduction
 Sequential Function Charts
 Rotary table in SFC
 Steps and conditions (example 011)
 Actions
 The main-program PLC_PRG
 Simulating example 11
 Entry- and exit action (example 012)
 Alternative branch
 Parallel branch
 Three parallel station (example 014)
 All station have a timer
 Simulate three parallel station
 Min/max time
 IEC-Steps
 Non graphical programming

 ST

 Introduction
 Expressions
 Instructions
 Variables
 Data types
 Station 1 and 2 with ST programming
 You do not see the counter running!
 IF-instruction in the station 2
 Counter
 IF-Instruction
 CASE-Instruction
 FOR-Loop
 WHILE, REPEAT, RETURN and EXIT
 P-Controller in Integer
 P-Controller in Real
 P-Controller as Function Block
 P-Controller as Function
 Function and Function Block
 Task
 Testing
 IL

 IL

 Introduction
 Example IL
 P-Controller in IL
 Loop in IL
 All operation and jump commands
 All IEC-programming languages

 CFC

 Introduction
 Self-locking circuit in CFC
 Self-locking circuit as macro

 THE END





 


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PLC

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