FX2 series PLC stepping sequential control instruction

~ arcozhang
FX series PLC 2 step instructions there are two: stepping contact instructions step and STL RET return instructions.

1, STL: stepping contact instructions Ladder diagram symbols
Significance of STL instructions to activate a State. Reflected in the ladder diagram from the bus status led on points. STL function of instruction established a bus, so that the State of all the child on the bus. Step contact instructions in the ladder diagram is shown in Figure 5 below.



2,Step return instructions Ladder diagram
RET instruction is used to return to the main bus bars. When completion of step–sequencer, non-State programs completed in the main bus, to avoid logic errors. Transfer the RET instruction must be used at the end of the program.




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