Chapter 14 PLC Function
|
C200 Series
14-34
Mnemonic Function
MC/MCR
Master control Start/Reset
Operand
N0~N7
1. MC is the main-control start command. When the MC command is executed, the
execution of commands between MC and MCR will not be interrupted. When MC
command is OFF, the motion of the commands that between MC and MCR is
described as follows:
Command Description
Timer
The counting value is set back to zero, the coil and
the contact are both turned OFF
Accumulative timer
The coil is OFF, and the timer value and the
contact stay at their present condition
Subroutine timer
The counting value is back to zero. Both coil and
contact are turned OFF.
Counter
The coil is OFF, and the counting value and the
contact stay at their present condition
Coils driven up by the OUT
command
All turned OFF
Devices driven up by the SET
and RST commands
Stay at present condition
Application commands
All of them are not acted , but the nest loop
FOR-NEXT command will still be executed for
times defined by users even though the MC-MCR
commands is OFF.
2. MCR is the main-control ending command that is placed at the end of the
main-control program and there should not be any contact commands prior to the
MCR command.
3. Commands of the MC-MCR main-control program support the nest program
structure, with 8 layers as its greatest. Please use the commands in order from N0~
N7, and refer to the following:
Command code:
Operation:
LD
X0
Load A contact of X0
MC
N0
Enable N0 common
series connection
contact
LD
X1
Load A contact of X1
OUT
Y0
Drive Y0 coil
:
LD X2
Load A contact of X2
MC
N1
Enable N1 common
series connection
contact
LD X3
Load A contact of X3
OUT Y1
Drive Y1 coil
:
Example
Ladder Diagram:
X0
MC
N0
X1
Y0
X2
MC
N1
X3
Y1
MCR
N1
MCR
N0
X10
MC
N0
X11
Y10
MCR
N0
MCR
N1
Disable N1 common
series connection
contact
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Call 1(800)985-6929 for Sales
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sales@deltaacdrives.com
