Hitachi NJI-350B - Manual (Page 69)

Chapter 5 Instruction Specifications
5-19
Item number Basic instructions-9 Name Trailing edge detection (AND DFN, OR DFN)
Ladder format Condition code Processing time ( µs) Remark
R7F4 R7F3 R7F2 R7F1 R7F0 Average Maximum
DER ERR SD V C
DFN n
DFN n
DFN n
DFN n
z z z z z
Instruction format Number of steps 1.0 ←
AND DFN n Condition Steps
OR DFN n AND DFN n 3
OR DFN n 4
Bit Word Double word
Usable I/O
X Y
R,
M
TD, SS,
CU, CT WX WY
WR,
WM TC DX DY
DR,
DM C
onstant Other
n Number { 0 to 511 (Decimal)
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 R124 LD
AND
OUT X00000
DFN0
R124 DFN0
Program description
X0
R124
1 scan time
Time chart
• 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.
A
ND DF
N
n
OR
DF
N
n