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2 Instructions
CP1E CPU Unit Instructions Reference Manual(W483)
Step Instructions
2
Step Instructions
In CP1E series PLCs, STEP(008)/SNXT(009) can be used together to create step programs.
Note Work bits are used as the control bits for A, B, C and D.
Instruction Operation Diagram
SNXT(009): STEP
START
Controls progression to the next step of the program. Step Ladder section start instruction
STEP(008): STEP
DEFINE
Indicates the start of a step. Repeats the same step pro-
gram until the conditions for progression to the next step
are established.
Step Ladder section start instruction
Equivalent to
Step
Equivalent to
STEP
A
a
SNXT
A
STEP
B
b
SNXT
B
STEP
C
c
SNXT
C
STEP
d
SNXT
D
a
b
c
d
Process A
Process B
Process C
End
Corresponds
Process A
Process B
Process C
a turns ON
Starts the step programming area
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