After converting a device/PLC, any parts, D-Scripts, Alarms, etc., must have their device addresses set again. Also, please save any screens that use a Special Switch set to [Screen Change].
If you change the device/PLC by clicking the [Change] button in the [Change Device/PLC] dialog box, the address conversion pattern may not display correctly if there is no device code at the destination. Confirm all device addresses used in the project and correct the relevant addresses.
When using an Ethernet communication driver with multiple connections, [UDP] or [TCP] cannot be set up in the same driver.
For example, when [Device/PLC1] has been set to MELSEC A Ethernet [UDP] type, [Device/PLC2] cannot be set to MELSEC A Ethernet [TCP] type.
When deleting the settings for multiple connected PLCs, connected devices whose addresses are already used inside a project cannot be deleted. If you cannot delete PLC settings, click [Project] menu - [Utility] command and open [Cross Reference]. You can then check which addresses are being used. Delete the PLC settings after either replacing the address in use or deleting the unused address.
You cannot stop the communication scan of a device specified with the System Area Start Address. However, if you are not using the System Data Area, you can stop the communication scan.
5.19.6 Display Unit (System Area) Settings Guide