Delta AS Series Programming Manual page 267

A S S er i es Pr o gr am m ing Ma n ua l
Instruction code
LDF/ANDF/ORF
Device DX

S
Data type
S
Symbol
_5
Explanation
1. LDF saves the current contents, and stores the contact falling-edge detection in the accumulative register.
2. ANDF connects the falling-edge detection of the contact in series.
3. ORP connects the falling-edge detection of the contact in parallel.
4. The system must scan LDF/ANDF/ORF to get the state of the device. Changes to the device state are not detected
until LDF/ANDF/ORF is scanned the next time.
5. Use the corresponding NED, ANED, and ONED instructions in subroutines.
Example
1. The falling-edge detection of X0.0 starts, the falling-edge detection of X0.1 is connected in series, the falling-edge
detection of X0.2 is connected in parallel, and the coil Y0.0 is driven.
2. When both X0.0 and X0.1 switches from OFF to ON, or when X0.2 switches from OFF to ON, Y0.0 is ON for a scan
cycle.
5 - 1 0
Operand
DY X Y
 

LDF
S ： Specified device
ANDF
ORF
Starting the falling-edge detection/Connecting the
S falling-edge detection in series/Connecting the
M SM S
  
Function
falling-edge detection in parallel
T C HC
  
D
