Rockwell Automation Publication 1756-PM006I-EN-P - February 2018 13
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 Logix 5000 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
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