Arithmetic instructions
425
Part III FP Instructions
F304_BACOS
BCD type Arccosine operation
BCD values for input s lie in the area from -1.0000 to 1.0000. They are entered as follows:
ARRAY[0] preceding sign (0 when input is +, 1 when input is -)
ARRAY[1] whole number before the decimal point (0 or 1)
ARRAY[2] numbers after the decimal point with 4 significant figures as a BCD
value (16#0000 to 16#9999).
This instruction also exists as a P instruction (for FP2/2SH, FP3/5, FP10/10SH PLC types), which
is only executed at the rising edge of the EN trigger. Select [Insert P instruction] from the
"Instructions" pane if you require a P instruction. To facilitate reuse, the instruction then appears
under "Recently used" in the pop-up menu. Press <Ctrl>+<Shift>+<v> within the programming
area to open the list of recently used elements.
PLC types
Availability of F304_BACOS (see page 1324)
Variable Data type Function
s ARRAY [0..2] of
WORD
area where angle data is stored in 3 words
d WORD result
For Relay T/C Register Constant
s WX WY WR WL SV EV DT LD FL dec. or hex.
d - WY WR WL SV EV DT LD FL -
No. IEC address Set If
R9007 %MX0.900.7 permanently
R9008 %MX0.900.8 for an instant
the input value for s is not a BCD value
or is not between -1.0000 and 1.0000.
R900B %MX0.900.11 to TRUE the result is 0.
R9009 %MX0.900.9 for an instant the result causes an overflow.
In the POU header, all input and output variables are declared that are used for programming this
function.
Description
The function calculates the arccosine of a BCD value that is entered at input s as an ARRAY with
three elements. The result is returned as BCD angular data in the range of 0° to 360° (16#0 to
16#360) at output d.
Data types
Operands
Error flags
Example
In this example, the same POU header is used for all programming languages. For an example
using IL (instruction list), please refer to the online help.
POU header
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