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Mitsubishi Electric A800 Programming Manual Page 137

800 series, plc function.
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Sequence instructions
Take note of the following points when using a nesting structure.
• A maximum of 15 nests (N0 to 14) can be used. When applying nesting, MC uses numbers from the lower nesting (N)
numbers upwards, whereas MCR uses numbers from the higher numbers downwards. If the order is reversed, the
structure is not a nesting structure and the PLC function cannot operate normally.
• If the nesting structure consists of MCR instructions collected in one location, the single lowest nesting (N) number can be
used to terminate all master controls.
Sequence program
Display in ladder mode
Nesting numbers of MCR are
Actual operation ladder
Since buses cross each other, normal
master control ladder cannot be created.


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