Delta C200 Series User Manual page 320

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Mnemonic
Rising-edge detection operation
LDP
Operand
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.
Ladder diagram:
Example
Please refer to the specification of each model series for the applicable range of
Remarks
operands.
If rising-edge status is ON when PLC power is off, then the rising-edge status will be
TRUE when PLC power is on.
Mnemonic
Falling-edge detection operation
LDF
Operand
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.
Ladder diagram:
Example
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X0~X17 Y0~Y17
X0
X1
Y1
X0~X17 Y0~Y17
X0
X1
Y1
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Chapter 14 PLC Function |C200 Series
:
MCR
:
LD
MC
LD
OUT
:
MCR
Function
M0~M799 T0~159
Command code:
LDP
AND
OUT
Function
M0~M799 T0~159
Command code:
LDF
AND
OUT
14-35
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Disable N0 common
series connection
N0
contact
Load A contact of X10
X10
Enable N0 common
series connection
N0
contact
Load A contact of X0
X11
Enable N0 common
Y10 series connection
contact
Load A contact of X1
Drive Y0 coil
N0
C0~C79 D0~D399
－
Operation:
Start X0 rising-edge
X0
detection
Series connection A
X1
contact of X1
Y1
Drive Y1 coil
C0~C79 D0~D399
－
Operation:
Start X0 falling-edge
X0
detection
Series connection A
X1
contact of X1
Y1
Drive Y1 coil
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