For Ethernet Connection - Brother MELSEC iQ-F TD-4420TN Program Reference Manual

4.2. For Ethernet connection

CPU parameter setting

The setting remains as default condition.
Registration of module labels

Select [Element Selection] → [Module] → [Module Label] → [FX5UCPU], and right-click [Add Module
Label].
Set as shown above.
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MELSEC iQ-R Brother Label Printer Sample Program Reference Manual