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DCN and eDCN networks for Advant MOD 300 DCS

Support and migration for DCN and eDCN networks for Advant MOD 300 DCS

The DCN, distributed communications network, is the communications medium which allows the functional and geographical distribution of the different subsystems - HMI, servers, I/O and most important, remote I/O, located close to the process.


DCN and eDCN networks life cycle status
DCN is in the Classic life cycle phase since Janruary 2016. ABB has migrations solutions to help customers evolve from DCN to eDCN, while local ABB units can offer temporary DCN to eDCN gateways during the migration phase.

eDCN is currently in the Active life cycle phase.

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DCN
eDCN

DCN, Distributed Communications Network

The basic structure of the Advant MOD 300 is a “backbone” ring, known as the Distributed Communications Network (DCN), with various subnetworks connected to it, and gateways allowing connection to other vendors’ equipment (such as Programmable Controllers and host computers).

The fact that it has been designed using available models and 
standards set by the ISO and IEEE is significant. It means that the system is capable of embracing existing installations and proprietary networks as well as encompassing future developments in networking standards. This allows the matching of capabilities and costs with the control and information requirements of process plants.

 
Each subsystem provides the functional elements and supporting operations for a portion of the overall plant control and management scheme. The DCN is the communications medium which allows the functional and geographical distribution of these subsystems.

 eDCN, enhanced distributed communications network

The basic structure of the eDCN on an Advant MOD 300 Software is an ethernet based bus with subnetworks connected to it. The eDCN has been designed using models and standards set by the ISO and IEEE. The eDCN is capable of connecting to existing DCN installations and other networks as well as encompassing future developments in networking standards. This allows the matching of capabilities and costs with the control and information requirements of process plants.

The eDCN is the communications medium which allows the functional and geographical

Physical Structure
The eDCN is made of up communications devices called nodes, and communication paths between the nodes called links. The bus topology permits effective implementation of critical network control strategies. To avoid the overhead associated with lots of collisions in a traditional “shared” Ethernet network, the eDCN uses a “switched” Ethernet technology that limits the collision domain to each node and a switch.


The eDCN is a bus network by which messages travel from node, to switch, to node. Physically,
it is a twisted pair 10Base-T cable interconnecting the nodes to switches that can be linked together in a “backbone” using 10Base-T or 100Base-X copper wire or fiber optics media. The dual eDCNs function simultaneously and provide parallel communications paths for data travelling through the system. The use of this dual network improves average response time by as much as 50%. In addition, it provides a high degree of security, as a failure of one of the networks causes the remaining one to automatically assume full service. distribution of these subsystems.

Multiple Network Domain Topology
The ability to interconnect two or more eDCN network domains makes it practical to have very large systems. Because the multiple network domain structure does not imply any hierarchy  (that is, no one domain has higher communication priority than any other), the choice of how many domains to use and which nodes should reside on each may be made on virtually any logical basis, such as:

• Geographic (various plant or process areas)
• Functional (groups of similar processes, unit train operations)
• Control system geographics (control room and process)
• System performance (localize high density traffic to improve access or response time)
• Fault tolerance (segment to localize fault impact)

This high degree of flexibility is possible due to the nature of the communications system. No matter how the domains are interconnected, the entire network appears to the users and APs as a single logical network.

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