Distributed I/O Devices

Distributed I/O devices can be connected to a Quantum EIO system in the following 2 ways:

Distributed I/O devices in a sub-ring have 2 Ethernet ports (to maintain the ring), and they support . An example of devices on a distributed I/O sub-ring would be several STB islands that use STB NIP 2311 NIMs.

Ethernet distributed I/O devices that can be put on distributed I/O clouds include 2 families of devices:

I/O Scanned Devices	Devices that Cannot be I/O Scanned
variable speed drives — Altivar ATV 32, 61, 71	Magelis HMI controllers
main protection and control functions — TeSys T	Pelco cameras
ETB (I/O modules), OTB (distributed I/O modules), and STB (modules connected on a single island)
remote masters — Profibus master interface, ETG1000 master interface, Hart master interface
Modbus TCP distributed I/O devices
third-party distributed I/O devices compatible with the Quantum EIO system

RSTP

(rapid spanning tree protocol) A protocol that allows a network design to include spare (redundant) links to provide automatic backup paths if an active link stops working, without the need for loops or manual enabling/disabling of backup links.