Delta Electronics Extension Digital I/O Module DOP-EXIO14RAE - Manual (Page 75)

Appendix C Use of Basic Instructions|DOP-EXIO Series
C-10 Revision March, 2008, Doc. Name: 2007PDD23000014
Mnemonic Functions
LDF Falling-edge Detection Operation
X0~X17 Y0~Y17 M0~M1279 S0~S127 T0~T127 C0~C254 D0~D599
Operand
9 9 9 9 9 9 -
Explanations:
The method of using LDF is the same as using LD, but the actions of the two instructions differ. LDF
saves the current content and store the detected status of falling-edge to the accumulative register.
Program Example:
Ladder diagram:
Instruction code: Operation:
LDF X0 Starting X0 falling-edge detection
AND X1 Series connecting A contact of X1
X0 X1
Y1
OUT Y1 Driving Y1 coil
Mnemonic Functions
ANDP Riding-edge Series Connection
X0~X17 Y0~Y17 M0~M1279 S0~S127 T0~T127 C0~C254 D0~D599
Operand
9 9 9 9 9 9 -
Explanations:
ANDP instruction is used in the series connection of the contacts’ rising-edge detection.
Program Example:
Ladder diagram:
Instruction code: Operation:
LD X0 Loading in A contact of X0
ANDP X1 X1 rising-edge detection in series
connection
X1 X0
Y1
OUT Y1 Driving Y1 coil
Mnemonic Functions
ANDF Falling-edge Series Connection
X0~X17 Y0~Y17 M0~M1279 S0~S127 T0~T127 C0~C254 D0~D599
Operand
9 9 9 9 9 9 -
Explanations:
ANDF instruction is used in the series connection of the contacts’ falling-edge detection.