DVP-ES2EX2/SS2/SA2/SX2/SE Operation Manual - Programming
Step jump. Used for a step to jump to another non-adjacent step. (Jumping
up/down to non-adjacent steps in the same sequence, returning to initial step, or
jumping among different sequences.)
Transition condition. The transition condition to move between each step point.
Alternative divergence. Alternative divergence is used for a step point to
transfer to different corresponding step points by different transition conditions.
Alternative convergence. Alternative convergence is used for two step points or
more to transfer to the same step point according to transition condition.
Simultaneous divergence. Simultaneous divergence is used for a step point to
transfer to two step points or more by the same transition condition.
Simultaneous convergence. Simultaneous convergence is used for two step
points or more to transfer to the same step point with the same transition
condition when multiple conditions are fulfilled at the same time.
5.3 The Operation of STL Program
Step ladder diagram (STL) is a programming method for users to write a program which functions
similar to SFC. STL provides PLC program designers a more readable and clear programming
method as drawing a flow chart. The sequences or steps in the below SFC is quite understandable
and can be translated into the ladder diagram opposite.
STL program starts with STL instruction and ends with RET instruction. STL Sn constructs a step
point. When STL instruction appears in the program, the main program will enter a step ladder
status controlled by steps. RET instruction indicates the end of a step ladder program starting from
initial steps S0 ~ S9 and every initial step requires a RET instruction as an end of STL program.
If there is no RET instruction at the end of a step sequence, errors will be detected by WPLSoft.
S0
S21
S22
S23
M1002
S0
SET
SET S22
S0
RET
S21
S
S22
S
SET
S21
S0
S
S23
S
SET S23
M1002
primary pulse
5-4
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