Rockwell-automation Logix5000 Controllers Sequential Function Charts P Bedienungsanleitung PDF herunterladen (Seite 11)

Chapter 1

Design a sequential function chart

A sequential function chart (SFC) is similar to a flowchart of your process. It

defines the steps or states through which your system progresses. It helps you do

the following:

• Organize the functional specification for your system.

• Program and control your system as a series of steps and transitions.

By using an SFC to specify your process, you gain these advantages.

• Since an SFC is a graphical representation of your process, it is easier to

organize and read than a textual version.

• Add notes that clarify steps or capture important information for use

later on.

• Print the SFC to share the information with other individuals.

• Since Logix5000 controllers support SFCs, you do not have to enter the

specification a second time. You are programming your system as you

specify it.

By using an SFC to program your process, you gain these advantages.

• Graphical division of processes into its major logic pieces (steps)

• Faster repeated execution of individual pieces of your logic

• Simpler screen display

• Reduced time to design and debug your program

• Faster and easier troubleshooting

• Direct access to the point in the logic where a machine faulted

• Easy updates and enhancements

Introduction

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P Bedienungsanleitung Seite 11