CALCULATE (Calculate)

S7-1200 Programmable controller

V20

11/2024
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Table of content

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CALCULATE (Calculate)
Table 1. CALCULATE instruction
1
LAD / FBD SCL Description

Use the standard SCL The CALCULATE instruction lets you create a math
math expressions to function that operates on inputs (IN1, IN2, .. INn) and
create the equation. produces the result at OUT, according to the equation
that you define.

Select a data type first. All inputs and the output

must be the same data type.

To add another input, click the icon at the last

input.

Table 2. Data types for the parameters

Parameter Data type1

IN1, IN2, ..INn SInt, Int, DInt, USInt, UInt, UDInt, Real, LReal, Byte, Word, DWord

OUT SInt, Int, DInt, USInt, UInt, UDInt, Real, LReal, Byte, Word, DWord

1 The IN and OUT parameters must be the same data type (with implicit conversions of the input
parameters). For example: A SINT value for an input would be converted to an INT or a REAL
value if OUT is an INT or REAL
Click the calculator icon to open the dialog and define your math function. You enter your
equation as inputs (such as IN1 and IN2) and operations. When you click "OK" to save the
function, the dialog automatically creates the inputs for the CALCULATE instruction.
The dialog shows an example and a list of possible instructions that you can include based on
the data type of the OUT parameter:

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 Note:
You also must create an input for any constants in your function. The constant value would
then be entered in the associated input for the CALCULATE instruction.
By entering constants as inputs, you can copy the CALCULATE instruction to other locations
in your user program without having to change the function. You then can change the
values or tags of the inputs for the instruction without modifying the function.

When CALCULATE is executed and all the individual operations in the calculation complete
successfully, then the ENO = 1. Otherwise, ENO = 0.

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