The M580 is an ePAC with an Ethernet backplane for supported communications. Its architecture includes the local rack, RIO drops on a deterministic ring, and DIO devices connected to the system network. The simulation shows these network roles, cyclic exchanges and the diagnostic response when a remote drop is disconnected.
The M580 CPU sits in the local rack. RIO (Remote I/O) drops hang on a redundant Ethernet ring for deterministic, time-critical I/O; DIO (Distributed I/O) devices provide other configured network exchanges. The animation shows cyclic traffic around the ring. Select ✂ Pull RIO drop 2 to disconnect that simulated drop and inspect the resulting diagnostic indication.
A single cable break leaves an alternative path around the illustrated ring, so the simulation continues its exchanges. A second break can isolate part of the network. Disconnecting a drop makes that station unavailable, and then the affected I/O and fault indication show the loss. Real recovery behaviour depends on the configured network and devices.
The local rack contains the CPU and its local I/O modules. The example uses topological addressing to associate signals with their rack positions (Track 02). Check the selected module's interface when planning the rack.
RIO drops are remote racks on the configured Ethernet RIO network. The ring provides an alternative path after a single cable break; cyclic exchanges supply the controller with remote input and output data.
DIO devices include drives, valve islands and other Ethernet devices. Their exchanges and timing depend on the device and configuration, so select them according to the application's data and control requirements.
These parts belong to the same controller architecture. The M580 supports Modbus TCP and EtherNet/IP communication, but that does not mean every local module uses an Ethernet interface. Plan the I/O, control and supervisory connections for the actual modules and network configuration.
The configured RIO network has a ring path. A maintenance technician cuts one ring cable in the simulation. How does the remaining path affect communication?