1756-PM003H-EN-E, SFC and ST Programming Languages ...

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13-10 Force Logic Elements For example, to exit this branch, the SFC must be able to: • execute Step_011 at least once • get past Tran_011 and execute Step_012 at least once • determine that Tran_012 is true Force a Simultaneous Path To prevent the execution of a path of a simultaneous branch, force the path false. When the SFC reaches the branch, it executes only the un-forced paths. 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). Publication 1756-PM003H-EN-E (excerpt from 1756-PM001H-EN-P) - August 2005
Force Logic Elements 13-11 • 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. Add an SFC Force 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 effect 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? If: off flashing solid Then note: No SFC forces currently exist. No SFC forces are active. But at least one force already exists in your project. When you enable SFC forces, all existing SFC forces will also take effect. SFC forces are enabled (active). When you install (add) a force, it immediately takes effect. 2. Open the SFC routine. 3. Right-click the transition or start of a simultaneous path that you want to force, and choose either Force TRUE (only for a transition) or Force FALSE. 4. Are SFC forces enabled? (See step 1.) If: no yes Then: From the Logic menu, choose SFC Forcing > Enable All SFC Forces. Then choose Yes to confirm. Stop. Publication 1756-PM003H-EN-E (excerpt from 1756-PM001H-EN-P) - August 2005
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