(3) Precautions for modifying SFC chart
(a) Add "
(dummy step)" as an additional step
If " (step)" is added, the step number + "?" is displayed/printed due to un-programmed operation output.
(b) As shown below, create a transition condition program in the additional step using a series transition (+).
If the transition condition program is not created, the transition condition number + "?" is displayed/printed
due to un-programmed transition condition.
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7.4 Utilize SFC programs (Replace MELSAP-ΙΙ with MELSAP3)