Chapter 16 PLC Function ApplicationsC2000-HS
16-47
Ladder diagram:
X0
MC
N0
X1
Y0
X2
MC
N1
X3
Y1
MCR
N1
MCR
N0
X10
MC
N0
X11
Y10
MCR
N0
Command
code:
Description:
LD X0 Load Contact a of X0
MC N0
Connection of N0 common series
contact
LD X1 Load Contact a of X1
OUT Y0 Drive Y0 coil
:
LD X2 Load Contact a of X2
MC N1
Connection of N1 common series
contact
LD X3 Load Contact a of X3
OUT Y1 Drive Y1 coil
:
MCR N1
Release N1 common series contact
:
MCR N0
Release N0 common series contact
:
LD X10 Load Contact a of X10
MC
N0
Connection of N0 common series
contact
LD X11 Load Contact a of X11
OUT Y10 Drive Y10 coil
:
MCR N0
Release N0 common series contact
Command Function
LDP
Start of forward edge detection action
Operand
X0–X17 Y0–Y17 M0–M799 T0–159 C0–C79 D0–D399
－
The LDP command has the same usage as LD, but its action is different; its function is to save
current content, while also saving the detected state of the rising edge of the contact to the
cumulative register.
Ladder diagram:
X1
Y1
X0
Command
code:
Description:
LDP X0
Start of X0 forward edge detection
action
AND
X1
Create series connection to
contact a of X1
OUT Y1 Drive Y1 coil
Please refer to the function specifications table for each device in series for the scope of usage
of each operand.
rising edge contact will be TRUE after power is turned on if the rising edge contact is On
before power is turned on to the PLC.
Command Function
LDF
Start of reverse edge detection action
Operand
X0–X17 Y0–Y17 M0–M799 T0–159 C0–C79 D0–D399
－
The LDF command has the same usage as LD, but its action is different; its function is to save
current content while also saving the detected state of the falling edge of the contact to the
cumulative register.
Ladder diagram:
X1
Y1
X0
Command code: Description:
LDF X0
Start of X0 reverse
edge detection action
AND
X1
Create series
connection to contact a
of X1
OUT Y1 Drive Y1 coil
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