Delta VFD300C43S-HS User Manual page 689

Ladder diagram:
X0
X1
X2
X3
X10
X11
Command
Start of forward edge detection action
LDP
X0–X17
Operand

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:
X0
Please refer to the function specifications table for each device in series for the scope of usage
of each operand.
A 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
LDF Start of reverse edge detection action
X0–X17
Operand

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:
X0
MC
N0
Y0
MC
N1
Y1
N1
MCR
N0
MCR
MC
N0
Y10
N0
MCR
Y0–Y17 M0–M799

X1
Y1
Y0–Y17 M0–M799

X1
Y1
16-47
Chapter 16 PLC Function ApplicationsC2000-HS
Command
code:
LD X0 Load Contact a of X0
Connection of N0 common series
MC N0
contact
LD X1 Load Contact a of X1
OUT Y0 Drive Y0 coil
:
LD X2 Load Contact a of X2
Connection of N1 common series
MC N1
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
Connection of N0 common series
MC N0
contact
LD X11 Load Contact a of X11
OUT Y10 Drive Y10 coil
:
MCR N0 Release N0 common series contact
Function
T0–159
 
Command
code:
Start of X0 forward edge detection
LDP X0
action
Create series connection to
AND X1
contact a of X1
OUT Y1 Drive Y1 coil
Function
T0–159
 
Command code:
LDF X0
AND X1
OUT Y1
Description:
C0–C79 D0–D399

－
Description:
C0–C79 D0–D399

－
Description:
Start of X0 reverse
edge detection action
Create series
connection to contact a
of X1
Drive Y1 coil