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V130 HMI: 'exiting a variable' - how in ladder logic?

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HELP! How does one 'exit a variable' while it is active on a V130 screen, ... via ladder logic, not the keyboard?

According to the 'V120 and V130' topic page in the help manual:

"If a Legal Entry bit is defined, SB 94 does not turn ON if the entered value is out of range. The keypad stays on screen until a legal value is entered. You can use SI 45 in conjunction with a Compare function to exit the variable."

How is this done?

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