Mitsubishi Electric MELSEC FX3U Programming Manual page 150

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
5. Input a device number to be set to "Device Label", and click the [Display] button.
6. Select the data type to be set in the two selection boxes to the right of the [Display] button.
7. Input data or character string to each device accordingly.
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4.10 Extension Register [R] and Extension File Register [ER]
4 Devices in Detail