1 Basic Principles of PLC Ladder Diagram 1.5 The Conversion of PLC Command and Each Diagram Structure Ladder Diagram LD X0 OR X1 LD X2 OR M0 ORI M1 ANB LD M2 AND Y0 ORB AN I X1 OUT Y0 AND C0 SET S0 STL S0 LD X10 OUT Y10 SET S10 STL S10 LD X11 OUT Y11 SET S11 SET S12 SET S13 STL S11 LD X12 OUT Y12 SET S20 STL S20 STL S12 STL S13 LD X13 OUT S0 RET LD X0 CNT C0 K10 LD C0 MPS AND X1 OUT M0 MRD AN I X1 OUT M1 MPP AN I M2 OUT M2 OR block OR block Series connection blcok AND block Parallel connection block ANI The output will continue following the status of Multiple outputs Step ladder Start Status S0 and X10 operation Status working item and step point transfer Withdraw S10 status Withdraw X11 status Status working item and step point transfer Withdraw S11 status Withdraw X12 status Status working item and step point transfer Bifurcation convergence End of step ladder Status working item and step point transfer Return Read C0 Multiple outputs END RST C0 End of program Fuzzy Syntax The correct ladder diagram analysis and combination should be conducted from up to down and left to right.
However, DVP-PLC Application Manual 1-12 X0 X2 X1 Y0 X1 M0 C0 SET S0 M1 M2 Y0 S0 X10 S Y10 SET S10 S10 X11 S Y11 SET S11 SET S12 SET S13 S11 X12 S Y12 SET S20 S20 S12 S13 X13 S S S S0 RET X0 CNT C0 K10 C0 X1 M0 X1 M1 M2 M2 RST C0 END X0 CNT C0 K10 C0 X1 M0 X1 M1 M2 M2 RST C0 END END