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Analog F(x) Function Block |
The analog F(x) function block will allow you to derive a value from an arbitrary mathematical formula involving any output from the device's existing function blocks. You can mix analog and digital values liberally. A digital value used in an analog context has the value 1.0 (On) or 0.0 (Off), and an analog value used in a digital context is On (value != 0.0) or Off (value = 0.0). The output of the block is an analog value.
| Parameter | Description |
| Name | Function block name, see common parameters |
| Units | Parameter's engineering units, see common parameters |
| Scale | Parameter's scale, see common parameters |
| Format | Parameter's format, see common parameters |
| Formula | The mathematical formula to compute the block's output value. |
The mathematical formula can contain the following operators:
| Operator | Description |
| + | Add |
| - | Subtract |
| * | Multiply |
| / | Divide |
| Operator | Description |
| > | Greater Than |
| < | Less Than |
| >= | Greater Than or Equal |
| <= | Less Than or Equal |
| = | Equal |
| Operator | Description |
| ! not | NOT |
| & and | AND |
| | or | OR |
Operator precedence is divided into three groups as shown below. Multiple operators from the same group are evaluated left to right. You can use parenthesizes liberally to force a particular evaluation order as required.
| Precedence | Operators |
| Highest | ! () |
| * / & | |
| Lowest | + - > < >= <= = | |
| Operator | Description |
| dt() | The elapsed time interval, in seconds, since last iteration |
| sin(x) | Trigonometric SIN function x is in radians |
| cos(x) | Trigonometric COS function x is in radians |
| sqrt(x) | Square root |
| min(x,y) | lesser of x or y |
| max(x,y) | greater of x or y |
| mod(x,y) | Floating point modulus, remainder of x / y |
| exp(x) | returns the exponential function of its argument; i.e., ‘e’ to the power of ‘x’. - MBus_io12_LCD & MBus_io14_DIN only |
| log(x) | returns the natural logarithm of 'x' - MBus_io12_LCD & MBus_io14_DIN only |
| pow(x,y) | returns x raised to the power of y (x^y) - MBus_io12_LCD & MBus_io14_DIN only |