Master Control Instruction: Master Control Set, Reset - Mitsubishi Electric A800 Programming Manual

Sequence instructions
3.25.8
Master control instruction: master control set,
reset ... MC, MCR
Bit device
X Y M
n
 
D
Nesting (N0 to 14)
Function
• This instruction is for creating an efficient ladder switching sequence program by opening and closing the common bus
of the ladder using the master control instruction. The following ladders use the master control.
MC
• When the MC ON/OFF instruction is turned ON at the start of master control, the operation results from MC to MCR are as
per the instruction (ladder).
• Even when the MC instruction is OFF, the scan time is not shortened because the scan is executed between the MC
instruction and MCR instruction.
Also, when the MC instruction is OFF, the operation results of MC and MCR are as follows.
100 ms, 10 ms timer
100 ms retentive timer, counter
Device currently under OUT instruction
SET, RST or SFT, or devices currently
executing basic or application instructions
• The MC instruction can use the same nesting (N) number any number of times by changing the
• When the MC instruction is ON, the coil of the device specified by
the same device is used by instructions such as the OUT instruction, do not use a device specified by
executing a different instruction.
134
Sequence program
Applicable device
Word (16-bit)
device
T C D
MC ON/OFF command
Device
Display in ladder mode of GPP
The count value becomes 0, and both coil and contact turn OFF.
The coil turns OFF, but the count value and contact both retain the current
state.
All turn OFF.
Retain the current state.
Digit
Constant Level
specification
K H N

Setting data
n
Actual operation ladder
D
is ON. Furthermore, as a double coil occurs when
Error flag
(SM0)
Nesting (N0 to 14)
Device number to be
D
turned ON
Y7
Executed
only when
X0 is ON.
YF
Y10
D
device.
D
when it is