Mitsubishi Electric MELSEC iQ-F Series Quick Start Manual page 16

9.
Select [Application Settings] and configure [DNS Settings] as shown below.
Item
To Use or Not to Use DNS Server Settings
DNS Server 1 Address
DNS Server 2 Address
DNS Server 3 Address
DNS Server 4 Address
10.
Select [Application Settings]  [MQTT Communication Setting], check that [To Use or Not to Use MQTT Function] is set
to "Used", and double-click <Detailed Setting> of [MQTT Connection Setting].
3 CONFIGURING CLIENTS (MQTT PUBLISHER, MQTT SUBSCRIBER)
15
3.1 Configuring Settings with GX Works3
Setting
Use
8.8.8.8
8.8.4.4
1.1.1.1
1.0.0.1