Using Watch Lists

What is a watch list?

A watch list is a user-defined list of project variables that are collected in one view for the purpose of monitoring their values. In online mode, you can write and force variable values in a watch list. Monitoring, writing, and forcing are handled the same way as the declaration editor in online mode. You can customize the format of the representation of floating-point values in the options for monitoring.

There are four, ready-to-use watch lists (Watch <n>) available in a project. Click View ‣ Watch .

Note

If the expression is an interface reference, then it can be expanded. If the interface points to a global instance, then this global instance is displayed as the first entry below the reference. If the interface reference changes, then the displayed reference is collapsed.

See also

Creating and editing a watch list (offline or online mode)

Requirement: The project is in either online or offline mode. It includes an application with declared variables that you want added to one of the four possible watch lists.

  1. Click View ‣ Watch ‣ Watch <n> .

    ⇒ The Watch <n> view opens. It contains a blank table row.

  2. Double-click the field in the Expression column and type a variable to monitor, either manually or with the input assistant.

    Syntax: <device name>.<application name>.<object name>.<variable name>

    Example: “Dev1.App1.PLC_PRG.ivar“

    If you type the name of a structured variable, then the individual components are displayed automatically in other lines in online mode.

  3. Define all successive variables that will be monitored with this list. You can change the order by using drag and drop operations.

    ⇒ The Execution point, Type, Address, Comment fields are filled in automatically according to the variables declaration. The symbol before the expression indicates the type of variable: input variable (), output variable (), or ordinary variable ().

Note

In online mode, you can also create or edit watch lists by right-clicking and choosing the Add Watch command.

See also

Adding variables by choosing the ‘Add Watch’ command (online mode)

Requirement: A project is open and running. It includes an application with declared variables that you want added to a possible watch list.

  1. Click View ‣ Watch <n> to open the watch list.

  2. Place the cursor on a variable in the declaration or implementation part of a POU and right-click to choose the Add Watch command.

    ⇒ This adds an entry to the list for the selected variable.

  3. You can add other variables in this way or by typing directly into the list in the Expression field as described above.

    ⇒ The watch lists are updated immediately.

Note

If a watch list is not open when you click Add Watch for a variable, then it is added automatically to the Watch 1 list.

Note

Writing and forcing variable values is also possible in the watch lists. In online mode, the Prepared value column is also available.

See also