Rockwell Automation Logix5000 Controllers Sequential Function Charts Programming Manual - Manual (Page 25)

Design a sequential function chart Chapter 1
Use actions to divide a step into the different functions that the step performs,
such as commanding a motor, setting the state of a valve, or placing a group of
devices in a specific mode.
How do you want to use the action?
There are two types of actions.
If you want to Then
• Execute structured text directly in the SFC
• Call a subroutine
• Use the automatic reset option to reset data upon leaving a step
Use a non-Boolean action on page 25
• Only set a bit and program other logic to monitor the bit to determine
when to execute.
Use a Boolean action on page 26
Use a non-Boolean action
A non-Boolean action contains the logic for the action. It uses structured text to
execute assignments and instructions or call a subroutine.
With non-Boolean actions, you also have the option to postscan (automatically
reset) the assignments and instructions before leaving a step.
• During postscan the controller executes the assignments and instructions as
if all conditions are FALSE.
• The controller postscans both embedded structured text and any subroutine
that the action calls.
To automatically reset assignments and instructions, see Turn off a device at the
end of a step on page 35 .
Add actions for each step
Rockwell Automation Publication 1756-PM006F-EN-P - October 2014 25