X20CM4800X - Data sheet V1.04
B&R offers an additional communication method for some modules. "Flatstream" was designed for X2X and POWERLINK networks and allows data transmission to be adapted to individual demands. Although this method is not 100% real-time capable, it still allows data transfer to be handled more efficiently than with standard cyclic polling.
Fig.: 3 types of communication
Flatstream extends cyclic and acyclic data queries. With Flatstream communication, the module acts as a bridge. The module is used to pass CPU queries directly on to the field device.