4 Step Ladder Instructions 4.5 Types of Sequences Single Sequence: The basic type of sequences The first step in a step ladder diagram is called the initial step, which can be S0 ~ S9. The steps following the initial step are general steps, which can be S10 ~ S1023. If you are using IST instruction, S10 ~ S19 will become the steps for zero return. a) Single sequence without divergence and convergence After a sequence is completed, the control power on the steps will be given to the initial step. Step ladder diagram M1002 SFC:
M1002 S0 X0 S0 S20 S S Y0 S20 Y0 X1 X1 S30 S Y1 X2 S30 Y1 X2 S40 Y2 S40 S Y2 X3 X3 X4 S50 Y3 S50 S X4 Y3 S60 Y4 S60 X5 S X5 Y4 S0 S0 RET DVP-PLC Application Manual 4-11 ZRST S0 S127 SET S0 SET S20 SET S30 SET S40 SET S50 SET S60 END