### External Device Settings

Use the programming software MELSOFT GX Works3 to set up communication settings on the External Device.

For details on communication settings, please refer to the manual for the External Device.

1. Start the programming software.

2. Open the [Module Parameter] window for the target CPU.

3. From the [Basic Settings], set up the following in [Own Node Settings].

   Setup Items | Setup Description
   --- | ---
   IP Address | 192.168.3.250
   Subnet Mask | 255.255.255.0
   Communication Data Code | Binary

4. From [To Use or Not to Use MODBUS/TCP Setting], select [Used].

5. From [External Device Configuration], click [Detailed Setting] and the [Ethernet Configuration] window opens.

6. From the [Module List] window’s [Ethernet Device (General)] area, select [MODBUS/TCP Connection] and drag and drop to the settings screen.

7. In the settings screen’s [MODBUS/TCP Connection], set up the following.

   Setup Items | Setup Description
   --- | ---
   Protocol | TCP
   PLC Port No. | 1025

8. To save the settings, in the [Module Parameter] window click [Apply].

9. The project is saved and sent to the External Device.
   Make sure the [Module Parameter] check box is selected.

10. Either turn the External Device power OFF/ON, or reset the External Device, to verify the changes.

NOTE

- Check with a network administrator about IP address. Do not set the duplicate IP address.

- Use an integer from 0 to 255 to enter the unit ID of the External Device.