When the data of A address of PLC A in Beijing changes, after using the Data-Mapping, the B address of PLC B in Guangzhou will keep exactly the same change as the data of A address of PLC A .
1. Devices locate in two places for real-time cooperative work through V-NET;
2. Synchronization, real-time and efficiency;
3. The channel would not be stopped as soon as it is established.