Delta Electronics VFD-E manual Ldp, Ldf

				Appendix D How to Use PLC Function
			LD	X11	Load A contact of X11
			OUT	Y10	Drive Y10 coil
		:
			MCR	N0	Disable N0 common series
					connection contact
Mnemonic				Function
LDP			Rising-edge detection operation
Operand	X0~X17	Y0~Y17		M0~M159		T0~15	C0~C7	D0~D29
	9	9		9		9	9	--

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:

X0

X1

LDP

X0

Start X0 rising-edge detection

Y1

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

9

9

9

9

9

--

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:

Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 D-41