# Steps to Design (Logging and Trend Graph)

You can learn how to design Data Logging and Trend Graph in this section.

Note:

- To create variables, see Steps to Design (Variables, Array, Structure).
- For sample projects, see Setting Examples.

- 1. Overview
- 2. Add Logging Group
- 3. Assign Variable
- 4. Add Object
- 5. Add Script

The display unit acquires and records data of multiple external device addresses. Also displays the acquired data on the trend graph.

Set the number of logged data to be recorded and the storage location.

For each logging group, set the time interval and frequency to collect the data, and select whether to export the data.

Assign variables associated with the device address to the logging group.

Note:

In the [Variable Selector] dialog box, you can select and add multiple variables at the same time.

- [Ctrl + Click]: Select variables one by one.
- [Shift + Click]: Select range of variables.
- [Ctrl + A]: Select all variables.

Add the below objects on the screen and configure its properties.

- Trend Graph object.
- Switch object (to export the logged data).

Add script for the switch to work.