Mitsubishi Electric FX3G SERIES Programming Manual page 207

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Caution
1. A circuit error (Error code: 6611) occurs when an instruction connected the bus line (such as LD
and LDI) is not present just after the MC instruction.
2. Cautions on writing during RUN
The PLC cannot detect errors if an instruction is added between the MC instruction and the N instruction by write
during RUN.
The PLC can detect errors after it is set to the STOP mode once and then to the RUN mode again.
Program examples
1) When the nesting structure is not adopted
Circuit program
X000
N 0 M100
X001
X002
X003
N 0 M150
X004
X005
MC N 0 M100
Y000
Y001
MCR N 0
MC N 0 M150
Y002
Y003
MCR N 0
List program
0000 LD X000
0001 MC N000
Three-step instruction
SP M100
0004 LD X001
0005 OUT Y000
0006 LD X002
0007 OUT Y001
N000 ← Two-step instruction
0008 MCR
← Return to the bus line ("N0" shows the
nest level.)
← When not adopting the nesting structure,
use "N0" again. There is no limitation in
the number of "N0".
Only in the nesting structure, increase
the nest level "N" in the way "N0 →
N1 ... N6 → N7" as shown in the
example 2 on the next page.
7 Basic Instruction
7.9 MC, MCR
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