For an SFC program, by default, the LAD program editor will not display any content.

图1 LAD program editor for SFC program (default state)

Select a state or transition of SFC, display and edit the embedded program of the selected element.

We selected the initial step 0 and edited its embedded program. This embedded program only starts working when S0=ON.。

图2 LAD Program Editor for SFC Program (Edit Embedded Program)

You can also edit the embedded program of the transfer. Select transfer 0 and edit the transfer conditions.

The instruction TRAN represents a transition, and the input condition of the TRAN instruction is the transition condition.

图3 LAD Program Editor for SFC Program (Edit Transfer Conditions)

You can insert state 1 below transition 0. When S0=ON and T0=ON, S0=OFF and S1=ON.

图4 Status transfer