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Functions
Function
Description
@SIN[n]
Sine of n (n in degrees, with range of -32768 to 32767 and 16-bit fractional resolution)
@COS[n]
Cosine of n (n in degrees, with range of -32768 to 32767 and 16-bit fractional resolution)
@TAN[n]
Tangent of n (n in degrees, with range of -32768 to 32767 and 16-bit fractional resolution)
@ASIN[n]*
Arc Sine of n, between -90 and +90 . Angle resolution in 1/64000 degrees.
@ACOS[n]*
Arc Cosine of n, between 0 and 180 . Angle resolution in 1/64000 degrees.
@ATAN[n]*
Arc Tangent of n, between -90 and +90 . Angle resolution in 1/64000 degrees
@COM[n]
1’s Complement of n
@ABS[n]
Absolute value of n
@FRAC[n]
Fraction portion of n
@INT[n]
Integer portion of n
@RND[n]
Round of n (Rounds up if the fractional part of n is .5 or greater)
@SQR[n]
Square root of n (Accuracy is +/-.004)
@IN[n]
Return digital input at general input n (where n starts at 0)
@OUT[n]
Return digital output at general output n (where n starts at 0)
@AN[n]
Return analog input at general input n (where n starts at 0)
@AO[n]
Return analog output at general output n (where n starts at 0)
*:
These functions are multi-valued. An application program may be used to find the correct
band.
Functions may be combined with mathematical expressions. The order of execution of mathematical
expressions is from left to right and can be over-ridden by using parentheses.
Examples:
V1=@ABS[V7]
The variable, V1, is equal to the absolute value of variable V7.
V2=5*@SIN[POS]
The variable, V2, is equal to five times the sine of the variable, POS.
V3=@IN[1]
The variable, V3, is equal to the digital value of input 1.
Variables
The number of variables available on the RIO depends on the option ordered, see Table 1.2.These
variables can be numbers or strings. A program can be written in which certain parameters, such as
I/O status or particular I/O bit, are defined as variables. The variables can later be assigned by the
operator or determined by program calculations. Example:
SB Red
Uses variable “Red” in SB command
input1=_@IN[1]
Assigns value of digital input 1 status to variable “input1”
Programmable Variables
Each variable is defined by a name, which can be up to eight characters. The name must start with an
alphabetic character, however, and numbers are permitted in the rest of the name.
Spaces are not
permitted.
Variable names should not be the same as RIO instructions. For example, RS is not a good
choice for a variable name.
Examples of valid and invalid variable names are:
Valid Variable Names
STATUS1
TEMP1
Chapter 5 Programming ▫ 70 RIO-47xxx Rev. 1.0r