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MELSEC-Q/QnA
5 SEQUENCE INSTRUCTIONS
High Performance
QnA Q4AR
Basic
QCPU
PLC CPU
Process CPU
5.5 Master Control Instructions
5.5.1 Setting and resetting the master control (MC, MCR)
Usable Devices
Internal Devices
(System, User)
MELSECNET/10(H)
Direct J
\
Other
Set
Data
Bit Word
File
Register
Bit Word
Special
Function
Module
U
\G
Index
Register
Zn
Constant
K, H
NDY
n
D
[Instruction Symbol] [Execution Condition]
Command
MCR
MC
n
n
n
Master control ladder
D
MC
D
MCR
[Set Data]
Set Data Meaning Data Type
n
Nesting (N0 to N14) Nesting
D
Number of device to turn ON Bit
[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:
X0
X1
[Ladder as displayed in GPP Ladder Mode]
M0N1
X3 M7
Y47
MC
M5
Y4F
X6 X4
N1MCR
X0F
Y10
M0N1
X0
X1
M0N1
X3 M7
Y47
MC
M5
Y4F
X6 X4
N1MCR
XF
Y40
M0N1
[Ladder as it actually operates]
Executed only
when X0 is ON
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