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Floating-point Math Instructions
Section 3-15
1.
This section of the program converts the data from BCD to floating-point.
a) The data area from D00200 onwards is used as a work area.
b) First BIN(023) is used to temporarily convert the BCD data to binary
data, and then FLT(452) is used to convert the binary data to floating-
point data.
c)
The value of x that has been converted to floating-point data is output
to D00203 and D00202.
d) The value of y that has been converted to floating-point data is output
to D00205 and D00204.
2.
In order to find the distance r, Floating-point Math Instructions are used to
calculate the square root of x
2
+y
2
. The result is then output to D00213 and
D00212 as floating-point data.
3.
In order to find the angle
θ
, Floating-point Math Instructions are used to
calculate tan
–1
(y/x). ATAN(465) outputs the result in radians, so DEG(459)
is used to convert to degrees. The result is then output to D00219 and
D00218 as floating-point data.
4.
The data is converted back from floating-point to BCD.
a) First FIX(450) is used to temporarily convert the floating-point data to
binary data, and then BCD(024) is used to convert the binary data to
BCD data.
b) The distance r is output to D00100.
c)
The angle
θ
is output to D00101.
3-15-1 FLOATING TO 16-BIT: FIX(450)
Purpose
Converts a 32-bit floating-point value to 16-bit signed binary data and places
the result in the specified result word.
Ladder Symbol
Variations
DM Contents
D00000
#0100
D00001
#0100
x
y
D00100
0 1 4 1
D00101
0 0 4 5
r
(BCD)
(BCD)
(BCD)
(BCD)
Distance r =
Angle
θ
= tan
−
1
χ
2
y
2
+
y
χ
---
Calculations
Distance r =
Angle
θ
= tan
−
1
100
2
100
2
+
141.4214
=
100
100
----------
180
π
÷
×
45.0
=
Examples
FIX(450)
S
R
S
: First source word
R
: Result word
Variations
Executed Each Cycle for ON Condition
FIX(450)
Executed Once for Upward Differentiation
@FIX(450)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification
Not supported.
Summary of Contents for SYSMAC CS Series
Page 2: ......
Page 4: ...iv ...
Page 30: ...xxx ...
Page 186: ...146 List of Instructions by Function Code Section 2 4 ...
Page 1320: ...1280 Model Conversion Instructions Unit Ver 3 0 or Later Section 3 35 ...
Page 1390: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...
Page 1391: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits ...
Page 1392: ...1352 ASCII Code Table Appendix A ...
Page 1404: ...1364 Revision History ...