206
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
7 Basic Instruction
7.9 MC, MCR
2) When the nesting structure is adopted
When using MC instructions inside MC instruction, increase the nest level "N" in turn in the way "N0
→
N1
→
N2
→
N3
→
N4
→
N5
→
N6
→
N7".
For returning from the nesting structure, reset the nest levels from the highest one in turn using MCR instruction in
the way "N7
→
N6
→
N5
→
N4
→
N3
→
N2
→
N1
→
N0".
For example, if "MCR N5" is programmed without programming "MCR N6" and "MCR N7", the nest level is
returned to 5 immediately.
Available nest levels are from N0 to N7 (eight layers).
[B]
[A]
[C]
[B]
While X000
is OFF
[A]
N 1
N 2
X000
MC
N 0
M100
N 0
M100
X001
Y000
X002
MC
N 1
M101
N 1
M101
X003
Y001
X004
MC
N 2
M102
N 2
M102
X005
Y002
MCR
N 2
X006
Y003
MCR
N 1
X007
Y004
MCR
N 0
X010
Y005
N 0
N 1
N 2
N 0
[D]
[C]
While
X002 is
OFF
While
X004
is OFF
Circuit program
Level N0
The bus line B is active while X000 is ON.
Level N1
The bus line C is active while both X000 and
X002 are ON.
Level N2
The bus line D is active while all of X000,
X002 and X004 are ON.
Level N1
The bus line returns to the status of the bus
line C by "MCR N2".
Level N0
The bus line returns to the status of the bus
line B by "MCR N1".
Initial status
The bus line returns to the initial status of the
bus line A by "MCR N0". Accordingly, Y005
turns ON or OFF by turning ON or OFF of
X010 regardless of X000, X002 and X004.