Yaskawa MP900 Series Machine Controller New Ladder Editor - Manual (Page 155)

1.7 DDC Instructions
1-145
1
If the data set in the parameter table for the FGN instruction are X
n
and Y
n
, the data must be
set so that X
n
≤ Y
n+1
. The FGN instruction searches for an X
n
/ Y
n
pair within the parameter
table for which X
n
≤ X ≤ Y
n+1
and computes the output value Y according to the following
formula:
If the X
n
/ Y
n
pair, which satisfies X
n
≤ X ≤ Y
n+1
for an input value X, does not exist in the
parameter table, the result will be as follows:
• IF X < X
1
• IF X > X
1
Table 1.23 Double-length lnteger or Real Type FGN Instruction Parameters
ADR Type Symbol Name Specifications I/O
0 W N Number of data Number of pairs of X and Y IN
1 W − (Reserved) Reserved register IN
2 L/F X1 Data 1 IN
4 L/F Y1 Data 1 IN
6 L/F X2 Data 2 IN
8 L/F Y2 Data 2 IN
••• ••• ••• ••• ••• •••
4N-2 L/F XN Data N IN
4N L/F YN Data N IN
Y
n+1
– Y
n Y = Y
n
+
X
n+1
– X
n
× (X– X
n
) (1 ≤ ≤ n N – 1)
Y
2
– Y
1 Y = Y
1
+
X
2
– X
2
(X– X
1
)
Y
n
– Y
n
-
1 Y = Y
n+ 1
+
X
n
– X
n -
1
(X – X
1
(
X1 X2 X X3 X 4
Y 1
Y 2
Y
Y 3
Y 4
Input value
Output
value