Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Scaricare il pdf (Pagina 22)

Chapter 1 Design a sequential function chart

Example situation Example solution

At station 12, the machine drills, taps, and bolts a part. The steps occur one after the

other.

Sequence

Step 12 inspects a process for the correct mix of chemicals.

• If OK, then continue with the remaining steps.

• If not OK, go to the top of the SFC and purge the system.

Wire

Sequence

A sequence is a group of steps that execute one after the other.

Selection branch

A selection branch represents a choice between one path (step or group of steps) or

another path (an OR structure).

• Only one path executes.

• By default the SFC checks the transitions from left to right.

22 Rockwell Automation Publication 1756-PM006F-EN-P - October 2014

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 87 88

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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