Rockwell Automation Logix5000 Controllers Sequential Function Charts Programming Manual - Manual (Page 21)

Design a sequential function chart Chapter 1
To Use this structure With these considerations
Loop back to a previous step Wire to a previous step on page 24 • Connect the wire to the step or simultaneous branch to
which you want to go.
• Do not wire into, out of, or between a simultaneous
branch.
Here are some examples of SFC structures for different situations.
Example situation Example solution
Station 45 and 46 of an assembly line work on parts simultaneously. When both
stations are done, the parts move down 1 station.
Simultaneous Branch
Depending on the build code, a station either drills or polishes. Selection Branch
To simplify my programming, I want to separate communications and block transfers
from other control logic. All occur at the same time.
Simultaneous Branch
In a heat treating area, the temperature ramps up at a specific rate, maintains that
temperature for a specific duration, and then cools at a specific rate.
Sequence
Rockwell Automation Publication 1756-PM006F-EN-P - October 2014 21