Automationdirect.com DL05 User Manual page 17

Learning to Draw State Transition Diagrams
Introduction to Process States
The Need for State Diagrams
A 2–State Process
RLL Equivalent
Stage Equivalent
Let's Compare
Initial Stages
What Stage Bits Do
Stage Instruction Characteristics
Using the Stage Jump Instruction for State Transitions
Stage Jump, Set, and Reset Instructions
Stage Program Example: Toggle On/Off Lamp Controller
A 4–State Process
Four Steps to Writing a Stage Program
Stage Program Example: A Garage Door Opener
Garage Door Opener Example
Draw the Block Diagram
Draw the State Diagram
Add Safety Light Feature
Modify the Block Diagram and State Diagram
Using a Timer Inside a Stage
Add Emergency Stop Feature
Exclusive Transitions
Stage Program Design Considerations
Stage Program Organization
How Instructions Work Inside Stages
Using a Stage as a Supervisory Process
DL05 Micro PLC User Manual, 6th Edition, Rev. D
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