A Quantum Ethernet I/O network can also transmit data from . This is accomplished by using devices that are configured to implement the following network design principles:
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Use of a 140 NOC 780 00 distributed I/O head module: A 140NOC78000 distributed I/O head module configured on the local rack and interlinked with the 140CRP31200 remote I/O head module manages distributed I/O devices in a Quantum EIO network.
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Use of Dual-Ring Switches (DRS): Distributed I/O data enters the Quantum EIO network from a distributed I/O device, which is attached to a Schneider Electric dual-ring switch (). Schneider Electric provides DRS
predefined configuration files for each switch, depending upon the role of the switch in the network.
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Implementation of Defined Architectures: A Quantum EIO network supports the addition of distributed I/O data traffic only in specific network designs, including:
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a joined by DRSs to one or more distributed I/O
— or —
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a remote I/O main ring joined to one or more remote I/O sub-rings, with distributed I/O devices connected to DRS ports on the main ring or a sub-ring
These designs provide for a limited number and type of junctions between network segments, and a limited hop count from any device to the PLC.
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QoS Traffic Prioritization: Distributed I/O packets are assigned the lowest priority. They wait in a queue until a device finishes transmitting all remote I/O data packets. This limits remote I/O jitter to 128 µs, which represents the time required to complete the transmission of 1 distributed I/O packet that has already begun.
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Distributed I/O Data is not delivered in real-time: Distributed I/O packets wait in a queue until all remote I/O packets are transmitted. Distributed I/O data transmissions use the network bandwidth that remains after remote I/O data has been delivered.
