Nesting (N) - Mitsubishi MELSEC QS Series User Manual

9
DEVICE EXPLANATION

9.4 Nesting (N)

(1) Definition
(2) Specifying method in master control instruction
N0 nesting N1 nesting
control range
control range
9
- 34 9.4 Nesting (N)
Nesting is a device used in the master control instruction (MC instruction, MCR
instruction) to program operation conditions in a nesting structure.
The master control instruction opens/closes a common ladder bus to create a
sequence program of efficient ladder switching.
Specify nesting in ascending order (in order of N0 to N14), starting from the outside of
the nesting structure.
Refer to the following manual for how to use nesting.
QSCPU Programming Manual (Common Instructions)
N0
N1
N2
N2 nesting
control range
Diagram 9.36 Program example using nesting
A
MC
M15
B
MC
M16
C
MC
M17
Designated in
ascending No. order
N0 M15
Executed when
condition "A" is
satisfied.
N1 M16
Executed when
conditions "A" and
"B" are satisfied.
N2
M17
Designated in
descending No. order
Executed when
condition "A", "B" and
"C" are satisfied.
MCR
N2
Executed when
conditions "A" and
"B" are satisfied.
MCR
N1
Executed when
condition "A" is
satisfied.
MCR N0
Executed regardless
of A, B, C condition
statuses.