M580 has two different system for communicate on ethernet : RIO system and DIO system. RIO system is mainly reserved for management of Mx80 I/O modules and/or some specific third-party modules. It provides deterministic communication on the main RIO ring and the RIO sub-rings so that RIO modules synchronize with CPU tasks (MAST, FAST, AUX0, AUX1); whereas DIOs is not deterministic:
The data to be sent will be shared from the application with the EIP scanner at the rate of the Mast task only and the scanner will send data at the rate of the RPI configured. These mechanisms are not synchronous. The received data by the scanner will be updated into the applicative variables at the rate of the Mast task.
- RIO Devices objects are associated to a task (Mast, Fast, Safe or Aux).
- DIO Devices objects are associated only on Mast task.
The data to be sent will be shared from the application with the EIP scanner at the rate of the Mast task only and the scanner will send data at the rate of the RPI configured. These mechanisms are not synchronous. The received data by the scanner will be updated into the applicative variables at the rate of the Mast task.
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