Equation

Use the Equation connector to create a new Tag computed from other Tags. You define a symbolic expression and map each symbol to an existing Tag. The result is calculated at the edge and can then be processed/stored like any other Tag output.

Equations apply to read tags but support both On Change and Periodic modes:

• On Change: Equation is computed every time any of the inputs change.

• Periodic: Equation is computed in fixed intervals.

If an On Change equation forms a feedback loop—referencing its own output directly or via other equations. The runtime detects the cycle and rate-limits evaluation to once per second to prevent runaway updates.

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Equation Editor

Use the Formula calculator editor to build equation Tags without hand-typing the full expression#assignments string. The UI validates syntax, lets you map symbols to Tags, and previews the computed result using test values.

When the Data Connection is set to Equation, it is possible to click the blue button to open the Equation Editor.

Clicking the blue button with the f(x) symbol opens the Equation Editor. The editor looks like this:

Equation Editor UI

• Variables table Contains a Tag reference for every symbol in the expression. Symbol : The symbol name Tag reference : Name of the Tag that maps to the symbol Test Value : Temporary value assigned to the symbol, to test the expression. + Add — declare a new symbol.

  ✎ — edit the existing symbol declaration..

  🗑 — remove the symbol declaration.

• Symbolic expressions A single-line input for the expression (e.g., a+b+9). Any symbol used here, must be declared in the Variables table. The expression is continuously validated, and the validation result is shown below the expression.

• Result Displays the evaluated value using the test inputs. This can be used to validate that the expression is correct, especially when defining more complex equations.

How to configure an Equation Tag

1. Declare symbols Click + Add for each symbol you’ll use (e.g., a, b). Map each to an existing Tag in Tag Reference.

2. Enter the expression Type your formula in Symbolic expressions (e.g., a+b+9, min(a;b)^c, if(a;1;2)*if(b;4;5)).

3. Verify Provide Test Values to check the logic; confirm you see Valid Expression and an expected Result.

4. Save The platform stores the configuration in the required format, e.g.: a+b#a=Area3.Asset3.Tag3;b=Area1.Asset1.NewTag

Syntax

An equation has two parts separated by #:

<symbolic expression>#<symbol assignments>

• Symbolic expression — The math/logic to evaluate, e.g.:

  • a+b

  • round(a)

  • sin(b)

  • a*b^c

• Symbol assignments — Map every symbol used in the expression to a Tag name:

  a=Asset1.PumpSpeed;b=Asset2.FlowRate;c=Asset3.Exponent

Examples

a+b#a=asset1.tag1;b=asset2.tag2
min(a;b)^c#a=asset1.tag1;asset1.b=tag2;asset1.c=tag3
2*pi*radius#radius=asset1.tag1

Null/invalid inputs propagate an invalid result for that evaluation.

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Constants

The symbols below denote built-in constants and may not be redefined or used as custom symbols:

• pi = 3.14159… → Example: 2*pi*radius#radius=asset1.R

• e = 2.71828… → Example: e^a#a=asset1.Exponent