Mitsubishi Electric 700 Series Programming Manual page 139

Sequence Instructions
MC
(1) When the MC ON/OFF command is on at the start of master control, the
operation results between MC and MCR are as performed by the instructions
(ladder).
(2) If the MC instruction is off, the scan between the MC and MCR instructions is
executed, and therefore, the scan time does not become short.
When the MC instruction is off, the operation results between MC and MCR are
as described below.
100ms, 10ms timer
100ms retentive timer, counter
Devices in OUT instruction
SET, RST,
SFT or device in instruction Maintains the current state.
basic
(3) By changing the device at
number any number of times.
(4) When the MC instruction is on, the coil of the device specified at
Since using the same device in the OUT instruction, etc. will result in double coils,
the device specified at
134
The count value is reset to 0 and both the coil and contact
turn off.
The coil turns off but both the count value and contact
maintain the current states.
All turn off.
D
, the MC instruction can use the same nesting (N)
D
should not be used in any other instruction.
D turns on.