Siemens SIMATIC S7-1500 Function Manual page 111

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3.13 Record
How does the system calculate a new signal?
The system checks:
● Whether you have selected a basic signal for the calculation of a new signal
● The name of the signal to be calculated
● The syntax of your JavaScript code
Subsequently the system defines the counting of the measuring points and executes the
code for each measuring point to be calculated. In each iteration the system stores the
measuring points of the new signal on the basis of the following four attributes:
● Measuring point
● Relative time
● Calculated Y value
● Signal point with x-, t, y-values
The course is displayed after calculation has been completed.
Example for calculating on the basis of a basic signal
You use a single basic signal to calculate the new signal. The basic signal consists of 1000
measuring points.
In this case the system carries out your written code a thousand times. The calculated signal
then consists of 1000 calculated signal points with the same x- and t-values, but with own y-
values.
Import/export settings
You can import/export certain parameters (formulas, calculation method, signal type and
signal name. To import parameters, click the
tab. To export parameters, click the
110
icon in the toolbar of the "Calculated signal"
icon in the toolbar of the "Calculated signal" tab.
Function Manual, 11/2019, A5E03484625-AG
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