1 Basic Principles of PLC Ladder Diagram Drawing by SFC Editor (WPLSoft ) DVP-PLC Application Manual 1-24 Drawn by SFC Internal Ladder Diagram LAD-0 S0 0 S20 S30 1 5 S21 S31 2 6 S22 S32 3 7 S23 S33 4 S0 LAD-0 M1002 ZRST S0 S127 SET S0 Transferring Condition 1 T0 TRANS* S22 TMR T2 K50 M1013 Y2 Transferring Condition 4 T13 TRANS* Transferring Condition 7 T12 TRANS* LAD-0 S0 ZRST S0 S127 SET S0 S20 S30 1 S21 S31 TMR T2 K50 S22 S32 3 S23 S33