D-51
Mnemonic Function
LDP
Rising-edge detection operation
Operand
X0~X17 Y0~Y17
M0~M159 T0~15 C0~C7 D0~D29
--
Explanations:
Usage of the LDP command is the same as the LD command, but the motion is different. It is used to
reserve present contents and at the same time, saving the detection status of the acquired contact
rising-edge into the accumulative register.
Program Example:
Ladder diagram:
Command code:
Operation:
X1
Y1
X0
LDP
X0
Start X0 rising-edge detection
AND X1
Series connection A contact of X1
OUT Y1
Drive Y1 coil
Mnemonic Function
LDF
Falling-edge detection operation
Operand
X0~X17 Y0~Y17
M0~M159 T0~15 C0~C7 D0~D29
--
Explanations:
Usage of the LDF command is the same as the LD command, but the motion is different. It is used to
reserve present contents and at the same time, saving the detection status of the acquired contact
falling-edge into the accumulative register.
Program Example:
Ladder diagram:
Command code: Operation:
X0
X1
Y1
LDF X0
Start X0 falling-edge detection
AND X1
Series connection A contact of X1
OUT Y1
Drive Y1 coil
