Chapter 5 Instruction Specifications
5-18
Item number Basic instructions-8 Name Leading edge detection (AND DIF, OR DIF)
Ladder format Condition code Processing time (µs) Remark
R7F4 R7F3 R7F2 R7F1 R7F0 Average Maximum
DER ERR SD V C
DIF n
DIF n
DIF n
DIF n
zzzzz
Instruction format Number of steps 1.0
AND DIF n Condition Steps
OR DIF n AND DIF n 3
OR DIF 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 rise of an input signal and retains the operation result only for one scan.
( ) indicates the display when the Ladder Editor is used.
Notes
DIF number may not be overlapped. (However, no error is generated even if overlapped numbers are used.)
DIF cannot use the b contact.
Program example
X00000 R123 LD
AND
OUT
X00000
DIF0
R123
DIF0
Program description
X
00000
R
123
1 scan time
Time chart
Upon leading of X00000 on, R123 turns on only for one scan.
If b-contact is used for X00000, operation will be the same as the a-contact DFN operation.
AND DIF n
OR DIF n