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5 SEQUENCE INSTRUCTIONS
5.5 Master Control Instructions
5.5.1 Setting and resetting the master control (MC, MCR)
Internal Devices
Set
(System, User)
Data
Bit
Word
n
D
[Instruction Symbol] [Execution Condition]
MC
MCR
[Set Data]
Set Data
n
D
[Functions]
The master control instruction is used to enable the creation of highly efficient ladder switching
sequence programs, through the opening and closing of a common bus for ladders.
A ladder using the master control would look as shown below:
[Ladder as displayed in GPP Ladder Mode]
X0
N1
M0
X1
X3 M7
M5
X6 X4
X0F
5 - 42
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MELSECNET/10(H)
File
Direct J \
Register
Bit
Command
n
D
Nesting (N0 to N14)
Number of device to turn ON
MC
N1
M0
Y47
Y4F
MCR
N1
Y10
QCPU
PLC CPU
Basic
High Performance
Usable Devices
Special
Function
Module
Word
U \G
MC
Master control ladder
Meaning
[Ladder as it actually operates]
X0
MC
N1
M0
X1
X3 M7
M5
X6 X4
XF
MELSEC-Q/QnA
QnA
Process CPU
Index
Other
Constant
Register
K, H
Zn
N
n
D
n
MCR
Data Type
Nesting
Bit
N1
M0
Y47
Executed only
when X0 is ON
Y4F
MCR
N1
Y40
5 - 42
Q4AR
DY
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