Mitsubishi Electric MELSEC iQ-F Series Quick Connection Manual page 36

3.
Insert a contact and input to B:i_bEN.
4.
Insert an FB Word device input to the left side of the FB. Insert an FB Word device output to the right side of the FB.
5.
Repeat these steps to create ladders.
5 EXAMPLE PROGRAMS
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5.2 How to Use the FB Library