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9.9   Nesting (N)

Nesting (N) is a device used in the master control instructions (MC and MCR instructions) to program operation 
conditions in a nesting structure.

The master control instruction opens or closes a common ladder gate to switch the ladder of a sequence program 
efficiently.
Specify the nesting (N) in ascending order (in order of N0 to N14), starting from the outside of the nesting 
structure.

For use of the nesting, refer to the following.

 QCPU Programming Manual (Common Instructions)

Executed when conditions  
A and B are met.

Executed when conditions  
A, B, and C are met.

Executed when conditions  
A and B are met.

Executed when condition  
A is met.

Executed when condition  
A is met.

M15

N0

B

C

A

M15

N0

MC

M16

N1

MC

N2

MCR

N1

MCR

M17

N2

MC

N0

MCR

M16

N1

M17

N2

Designated in  
ascending No. order

Designated in  
descending No. order

Control 
range of 
nesting N0

Control 
range of 
nesting N1

Control 
range of 
nesting N2

Executed regardless of  
conditions A, B, and C.