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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
zzzzz
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
XY
R,
M
TD, SS,
CU, CT WX WY
WR,
WM TC DX DY
DR,
DM
Constant
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 DFN n
OR DFN n