Rockwell-automation Logix5000 Controllers Sequential Function Charts P User Manual Page 12
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Chapter 1 Design a sequential function chart
A sequential function chart (SFC) is similar to a flowchart. It uses steps and
transitions to perform specific operations or actions. This example shows the
elements of an SFC. The SFC continues on the following page.
A step represents a major function of y
our process. It contains the actions that occur at a particular time, phase,
or station.
An action is one of the functions that a step performs.
A transition is the TRUE or FALSE condition that tells the SFC when to go to the next step.
A qualifier determines when an action starts and stops.
A simultaneous branch executes more than 1 step at the same time.
JSR instruction calls a subroutine.
What is a sequential
function chart?
12 Rockwell Automation Publication 1756-PM006F-EN-P - October 2014
- Programming Manual 1
- Important user information 2
- Summary of changes 3
- Table of contents 5
- Program a sequential 6
- Chapter 3 7
- Force steps 7
- Preface 9
- Studio 5000 environment 9
- Additional resources 10
- Chapter 1 11
- Introduction 11
- What is a sequential 12
- Define the tasks 14
- Choose how to execute the 15
- Define the steps of the 16
- SFC_STEP structure 17
- Organize the steps 20
- Sequence 22
- Selection branch 22
- Simultaneous branch 23
- Wire to a previous step 24
- Add actions for each step 25
- Use a Boolean action 26
- SFC_ACTION structure 27
- Describe each action in 28
- Choose a qualifier for an 29
- Define the transition 30
- Transition tag 31
- Use a BOOL expression 32
- Transition after a specified 33
- Example 35
- Choose a last scan option 36
- Use the Don’t Scan option 38
- Keep something on from 42
- Store and reset an action 43
- Use one large step 44
- End the SFC 45
- Restart (reset) the SFC 46
- SFC_STOP structure 47
- Nest an SFC 48
- Configure when to return to 49
- Pause or reset an SFC 50
- Execution diagrams 50
- Chapter 2 55
- Create a simultaneous 56
- End a simultaneous branch 57
- Create a selection branch 58
- Set the priorities of a 59
- Connect a wire to the step 60
- Hide a wire 61
- Configure a step 62
- Program a transition 64
- Add an action 65
- Configure an action 65
- Program an action 67
- Assign the execution order 69
- Document an SFC 70
- Add structured text comments 71
- Add a tag description 72
- Add a text box 72
- Configure the execution of 74
- Verify the routine 75
- Edit an SFC online 75
- • Modify indicator tags 76
- Disable or remove a force 78
- Check force status 78
- Force LED 79
- GSV instruction 79
- When to use an SFC force 81
- Force a simultaneous path 82
- Add an SFC force 83
- Remove or disable forces 84
- Index 87
- Rockwell Automation support 88
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