# Overview

Data logging collects and stores values in device addresses associated with variables. You can specify the timing for collecting data and how much data is stored. Display logging data in a Trend Graph object.

The Trend Graph supports boolean, real, integer, string, date, and time variables. The number of variables you can collect in a project depends on the display unit.

Note:

- Set up a logging condition (Value Change/Periodic/Script) for each logging group.
- Export logging data with the [Export Log Data] operation.
  Export Log Data
- Data Logging can be saved in a backup memory or an external storage. To calculate the size of Data Logging, see Calculating the Size of Data to Save.
- When a communication error or power failure occurs, depending on the status of data, an icon may appear or a part of the graph color changes to gray in the Trend Graph.
  Status of Data

WARNING
WRONG DATA REPORTED/LOGGED Do not depend on the integrity of the HMI's logging data for critical safety actions. Collect critical logging data on the external device responsible for corrective actions. Failure to follow these instructions can result in death, serious injury, or equipment damage.

## When Using SP5000 Series Open Box (Windows 10 IoT Enterprise Model)

NOTICE
LOSS OF DATA Do not turn OFF the power while writing to a storage device that is not protected by the write filter (write protection). Disable the write filter settings before starting the runtime application. Failure to follow these instructions can result in equipment damage.