This function block can be used for mathematical calculations. A formula with a maximum of 4 analogue values can be calculated, the result will be provided at the output. An area of application is the calculation of the level of a water tank. The formula is defined in the properties of the function block.

Table of Contents


Abbreviation Summary Description Value Range
R Result
E Error E.g. an illegal mathematical operation. -


Abbreviation Summary Description Value Range Default Value
I1-4 Value 1-4 This value can be used in the formula. A constant value can be also be set in properties. 0


Summary Description Default Value
Formula The 4 inputs are referred to as I1,I2,I3,I4.

The following operands are available: +,-,*,/,^

The following functions are available: PI, ABS, SQRT, LN, LOG, EXP, SIN, COS, TAN, ARCSIN, ARCCOS, ARCTAN, SINH, COSH, TANH, RAD, DEG, SIGN, INT, IF

Trigonometric functions use Radians as the unit of measure, inputs in degrees have to be converted first (e.g SIN(RAD(I1))).

Example: (I1+(I2*0,005))/SIN(I3)

Supported Features

+ : Add

- : Subtract

* : Multiply

/ : Divide

^ : Power x^n

PI : PI (~3,14)

ABS : Absolute value ABS(I1) => |I1|

SQRT : Square Root SQRT(I1)

LN : natural logarithm with the base e LN (I1)

LOG : LOG logarithm base 10 LOG(I1)

EXP : Exponential Function EXP(I1) => e^I1

SIN : Sine SIN(I1)

COS : Cosine COS(I1)

TAN : Tangent TAN(I1)


ARCCOS : Arc Cosine ARCCOS(I1)

ARCTAN : Arc Tangent ARCTAN(I1)

SINH : Hyperbolic Sine SINH(I1)

COSH : Hyperbolic Cosine COSH(I1)

TANH : Hyperbolic Tangent TANH(I1)

RAD : Angular representation in radians (360°=2PI)

DEG : Angle display in degrees (360°)

SIGN : Signum function (Sign Function) SIGN(I1)

INT : Integer function (removes decimals) INT(I1)

IF : If function, examples:
IF(I1 > 0;1;0)