One master display unit and 16 slave display units can be connected to one PLC simultaneously.
Only the master display unit communicates with the PLC. Slave display units communicate with the master display unit.
Please refer to the following for models that support Ethernet Multilink settings.
1.5 Supported Features
GP-Viewer EX can be connected only to the master display unit. Refer to the following for information on GP-Viewer EX.
Chapter 37 Viewing and Operating Display Unit Data and Video Images from GP-Viewer EX, Web Server, and Camera-Viewer EX
If you control the same PLC/device address in parts on multiple display units, it may not operate properly.
For example, if you set up the same address in the Data Block Display Graph's control word, even though you update the graph on the Master display unit the graph will update on Slave display units but not the Master display unit. To prevent this type of behavior, use a different address on each display unit.
If the [Reflect in Device/PLC] check box is selected (accessible from [Project] menu, [System Settings], [Display Unit], [Display Settings] tab), and the same items are used on Master and Slave display units, the [System Area Start Address] will be the same for all display units.
For example, if you change a shared screen number, the Master and all the Slave display units will synchronize their screen displays.
If you want to connect multiple display units using serial connection (Serial Multilink feature), see the GP-Pro EX Device/PLC Connection Manual.
7.6.1 Procedure - Connecting Multiple Display Units to One Device/PLC (Ethernet Multilink)
7.6.2 Procedure - How to Calculate the Communication Traffic