Planning an Extended Distributed I/O Network
Original instructions
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Introduction
Plan an extended distributed I/O network if you have an existing distributed I/O network — which you may not want to reconfigure — that you want to add to the Quantum EIO system.
An extended distributed I/O network is an Ethernet-based network containing distributed I/O devices on a copper wire running from a single port connection. If you use dual-port devices that support RSTP, you can connect the devices in a daisy chain loop to the device network ports (ETH 3 and ETH 4) on the 140NOC78000 distributed I/O head module on the local rack. The network is connected to the 140CRP31200 remote I/O head module, making the extended distributed I/O network part of the Quantum EIO system. The 140NOC78000 module is connected to the service/extend port of the 140NOC78100 control head module to provide transparency between the control network and the extended distributed I/O network.
Attaching an Extended Distributed I/O Network
To attach an extended distributed I/O network to a Quantum EIO system:
Step
Action
1
Install one 140CRP31200 remote I/O head module, one 140NOC78100 control head module, and up to five 140NOC78000 distributed I/O head modules (up to 3 modules can be interlinked with the 140CRP31200 module and 1 can be interlinked with the 140NOC78100 module) on the local rack.
2
Connect the interlink port (ETH 2) of the 140NOC78000 module to the interlink port (ETH 2) of the 140CRP31200 module.
3
Connect the device network/interlink port (ETH 3) of the 140NOC78000 module to the service/extend port (ETH 1) of the 140NOC78100 module.
4
Connect the device network (ETH 4) of the 140NOC78000 module to your existing distributed I/O network.
5
Connect the control network port (ETH 3 or ETH 4) of the 140NOC78100 module to the control network.
6
Connect the start of the main ring to the device network port (ETH 3 or ETH 4) of the 140CRP31200 module.
7
Connect the end of the main ring to the device network (ETH 3 or ETH 4) of the 140CRP31200 module.
8
Connect DRSs to the main ring for distributed I/O sub-rings and/or distributed I/O clouds.
Refer to the Predefined Configuration Files topic in the Quantum EIO System Planning Guide for details on installing DRSs.
Example
The following graphic shows an extended distributed I/O network (4). The 140NOC78000 distributed I/O head module is interlinked with the extend port of the 140NOC78100 control head module. The 140NOC78000 module and the 140NOC78100 module are also interlinked with the 140CRP31200 remote I/O head module. Thus, the extended distributed I/O network participates in the Quantum EIO device network. 
1
140CRP31200 remote I/O head module on the local rack 
2
140NOC78000 distributed I/O head module (interlinked with the extend port of the 140NOC78100 module to support the extended distributed I/O network and interlinked with the 140CRP31200 module to support the device network) 
3
140NOC78100 control head module (interlinked with the 140NOC78000 module to provide transparency between the control network and the device network) 
4
extended distributed I/O network, which communicates with the Quantum EIO system 
5
distributed I/O sub-ring 
6
DRSs — with C4 predefined configuration files — for copper-to-fiber and fiber-to-copper transitions on the main ring 
7
distributed I/O cloud 
8
remote I/O drop on the main ring 
9
remote I/O drops on the remote I/O sub-ring 
10
DRS with a C1 predefined configuration file on the main ring connected to the remote I/O sub-ring 
11
control network