Delta CFP2000 Series User Manual page 622

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
Start of reverse edge detection action
LDF
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
Command
Forward edge detection series connection
ANDP
X0–X17
Operand

The ANDP command used for a contact rising edge detection series connection.
Ladder diagram:
X0
Y0–Y17 M0–M799

X1
Y1
Y0–Y17 M0–M799

X1
Y1
Y0–Y17 M0–M799

X1
Y1
16-49
Chapter 16 PLC Function Applications│CFP2000
Function
T0–159
 
Command
code:
Start of X0 forward edge detection
LDP X0
action
Create
X1
AND
contact a of X1
OUT Y1 Drive Y1 coil
Function
T0–159
 
Command code:
LDF X0
X1
AND
OUT Y1
Function
T0–159
 
Command code:
LD X0
ANDP
X1
OUT Y1
C0–C79 D0–D399

－
Description:
series connection
C0–C79 D0–D399

－
Description:
Start of X0 reverse
edge detection action
Create series
connection to contact a
of X1
Drive Y1 coil
C0–C79 D0–D399

－
Description:
Load Contact a of X0
X1 Forward edge
detection series
connection
Drive Y1 coil
to