Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 785

Step Instructions
Corresponds
Process A
Process B
Process C
End
Note
3-21-1 STEP DEFINE and STEP START: STEP(008)/SNXT(009)
Purpose
Ladder Symbols
752
Process A
Process B
Process C
Work bits are used as the control bits for A, B, C and D.
SNXT(009) is placed immediately before the STEP(008) instruction and con-
trols step execution by turning the specified control bit ON. If there is another
step immediately before SNXT(009), it also turns OFF the control bit of that
process.
STEP(008) is placed immediately after the SNXT(009) instruction and before
each process. It defines the start of each process and specified the control bit
for it. It is also placed at the end of the step programming area after the last
SNXT(009) to indicate the end of the step programming area. When it
appears at the end of the step programming area, STEP(008) does not take a
control bit.
SNXT(009)
B
Starts the step programming area
a turns ON
Proceeds to the next step
Process A repeated until b turns ON.
b turns ON
Process B repeated until c turns ON.
c turns ON
Process C repeated until d turns ON.
Proceeds to the end of the ladder
step programming area
d turns ON
Step programming area completed
B: Bit
Section 3-21