Read Variable

Exposes the current value of a declared Flow variable as data.

When to use

Use it when a calculation or decision needs a value stored in Variables.

Example

Read the last stored signal value and connect it to Expression.

Try it here

Explore Read Variable

Exposes the current value of a declared Flow variable as data.

Exercise steps

1. Open Variables and rename threshold using the real rename action.
2. Return to Read Variable and inspect the updated reference.

Start lesson

Read after the write

With a declared numeric signalCount initially 0, Read Variable supplies 0 before a Set Variable update and 1 after an Increment-by-1 update in the same supported state context. Connect Value to a compatible Expression or Condition input. The node only reads; it has no control outcome and does not itself force the Set Variable branch to run first. Put the read on the intended execution path and inspect the run order when a value appears stale. A missing declaration or incompatible type needs correction in the Variables workspace, not a guessed string in the node.

Common problems

Select an existing declaration and check its type. Read Variable supplies data and does not start a control path.

Next steps

Review the generated Parameters, Outcomes, and Data Ports on this page, then open the related guides for the complete workflow.