Hitachi HIDIC MICRO-EH Applications Manual page 69

Item number Basic instructions-9
Ladder format
DFN n DFN n
DFN n DFN n
Instruction format
AND DFN n
OR DFN n
Usable I/O
n Number
Function
•
Detects the fall of an input signal and retains the operation result only for one scan.
( ) indicates the display when the Ladder Editor is used.
Notes
•
DFN number may not be overlapped. (However, no error is generated even if overlapped numbers are used.)
•
DFN cannot use the b contact.
Program example
X00000 DFN0
Program description
Time chart
X0
R124
1 scan time
•
Upon a fall of X00000, R124 turns on only for one scan.
•
If b-contact is used for X00000, operation will be the same as the a-contact DIF operation.
Name
Condition code
R7F4 R7F3 R7F2
DER ERR SD
Number of steps
Condition
AND DFN n
OR DFN n
Bit
R, TD, SS,
X Y M CU, CT WX WY
R124
5-19
Chapter 5 Instruction Specifications
Trailing edge detection (AND DFN, OR DFN)
Processing time (µs)
R7F1 R7F0
Average Maximum
V C
1.0
Steps
3
4
Word Double word
WR, DR,
WM TC DX DY DM
LD X00000
AND DFN0
OUT R124
Remark
←
Other
0 to 511 (Decimal)