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4.6 MC
Master Control (Start)
MCR
Master Control Reset (End)
Project name QB-8
Program name MAIN
X7
X2
X3
NO M98
Y71
MCR NO
Y70
MC
0
3
5
7
• The above program is a basic one.
• MC N M to MCR N (indicated as "MC to MCR" hereafter.)
The available nesting (N) numbers for "MC to MCR" are from N0 and N14.
• The scan time skipped by "MC to MCR" hardly changes.
The device status of the program skipped by "MC to MCR" becomes as follows;
All the devices in the OUT instruction are turned off.
The devices in the SET, RST, and SFT instructions, the counter, and retentive
timer keep their statuses.
The 100ms timer and 10ms timer are reset to 0.
Application
• The instructions can be used for a program for switching between manual and
automatic operations. (Refer to Ladder example.)
Applicable device
Internal device
(system or
user)
File
register
MELSECNET/
10 (H) Direct
Jn\
Index
register
Constant
Pointer
Level
Bit Word R Bit Word
Intelligent
function
module
Un\G
Z K H P I N
Digit
Number of basic
steps
n
MC
MCR
n
n
D
D
2
1
The number of basic steps of the MC instruction is two, and that of the MCR instruction is one.