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1.5.11 STL (Step Ladder Programming)
STL programming uses step points, e.g. S0 S21, S22, which allow users to program in a clear and
understandable way like drawing a flow chart. The program will proceed to the next step only if the
previous step is completed, therefore it forms a sequential control process similar to SFCs
(Sequential Function Charts). The STL sequence can be converted into an ELC ladder diagram
which is called “step ladder diagram” as below.
e
S0
S21
S22
M1002
initial
pulse
M1002
SET
S0
SET
S21
S
S0
SET
S22
S
S21
S
S22
S0
RET
1.5.12 RET (Return)
A RET instruction must be placed at the end of a sequential control process to indicate the
completion of STL flow.
e
S
S20
RET
e
S
S20
RET
Note: Always connect the RET instruction immediately after the last step point indicated in the
above diagram or a program error may occur.
Содержание ELC-PB
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