Rockwell Automation Logix5000 Controllers Sequential Function Charts Programming Manual - Manual (Page 83)

Force steps Chapter 3
This path executes. This path does not
execute.
If you force a path of a simultaneous branch to be FALSE, the SFC stays in the
simultaneous branch as long as the force is active (installed and enabled).
• To leave a simultaneous branch, the last step of each path must execute at
least one time and the transition below the branch must be TRUE.
• Forcing a path FALSE prevents the SFC from entering a path and executing
its steps.
• When you remove or disable the force, the SFC can execute the steps in the
path.
To override the logic of an SFC, use an SFC force.
ATTENTION Forcing can cause unexpected machine motion that could injure personnel. Before you use a force,
determine how the force will affect your machine or process and keep personnel away from the
machine area.
• Enabling SFC forces causes your machine or process to go to a different state or phase.
• If forces are enabled and you install a force, the new force immediately takes effect.
1. What is the state of the SFC Forces indicator?
Add an SFC force
Rockwell Automation Publication 1756-PM006F-EN-P - October 2014 83