Arithmetic instructions
421
Part III FP Instructions
F302_BTAN
BCD type Tangent operation
BCD values for input s lie in the area from 0° to 360° (16#0 to 16#360) in 1° steps. With this output
d yields a result in the range of -57.2900 to 57.2900. The result is returned as follows:
ARRAY[0] preceding sign (0 when input is +, 1 when input is -)
ARRAY[1] whole number before the decimal point as BCD value (16#0 to
16#57)
ARRAY[2] numbers after the decimal point with 4 significant figures as 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 F302_BTAN (see page 1324)
Variable Data type Function
s WORD area where angle data is stored
d ARRAY [0..2] of
WORD
result stored in 3 words
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
s = 90° (16#90) or 270° (16#270)
R900B %MX0.900.11 to TRUE the result is 0.
R9009 %MX0.900.9 for an instant the result causes an overflow.
Description
The function calculates the tangent of BCD code angular data (input s) and stores the result
(output d) as a BCD value in an array with three elements.
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.
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