OPC | DNP3
Resources links to informations about communication technologies and "pure" protocols met in industrial automated applications, implemented on various supports and/or various platforms , and not attached with a particular material.
Introductions | OPC foundation | OPC-DA | OPCconnect
"OPC is open connectivity in industrial automation and the enterprise systems that support industry. Interoperability is assured through the creation and maintenance of open standards specifications. There are currently seven standards specifications completed or in development."
www.opcfoundation.org
OPenDA is an implementation of the OPC foundations OPC XML-DA 1.0 standard, which provides a standards based publish-subscribe web service for distributing information through a client-server architecture.
OPenDA is an open source free (to use) software.
NOTE : OPC XML-DA allow access to datas without using Microsoft's DCOM technologie, then datas can be transmitted on any software or hardware platforms, and datas exchange can be executed through firewalls (that is impossible with DCOM).
"Opcconnect.com" is a site dedicated to the needs of the softwares / solutions developpers working with OPC.
Mike DILLAMORE provides a set of OPC resources :
Introduction to DNP3 | DNP3 on the web | Documents about DNP3
DNP3 is a multi-drop and master-slave distributed network protocol especially designed for SCADA communications for power systems.
DNP 3 was originally developped by GE-Harris in 1993, and then becomes an open standard especially designed and compliant to power industries, particularily for electric power production and distribution.
DNP 3 is now controlled by the DNP user group which groups all the actors in the industry interessed in DNP3, including vendors and services.
One particular point according to the SCADA systems for power supply systems is to need a high level of availability, a high level of measurement accuracy and high security.
Another particular point is collecting small quantities of datas from a large number of remote sites.
To take in account theese particularities, in order to obtain efficient communications, the DNP3 protocol only use the layers 1 (physical layer), 2 (links layer) and 7 (application layer) of the OSI model.
DNP3 is designed to work with a great inter-operabilty between local area networks (LAN) and wide area networks (WAN), and allows to collect datas towards a master server from concentrators, programmable logic controllers or intelligent electronic devices (IED).
You will find in the last news about the evolutions of the protocol, an averview of the protocol, the services provided by DNP 3 and the benefits, a list of resources and documentation, a list of users.
You will find an introduction to the DNP User group too, and a list of its members.
You will find here a list of documents about DNP3 protocol : videos, white papers, overviews, slides, XML usage with DNP3 and more.
From this page, you can download ( .pdf format) this document which presents the DNP 3 protocol in details (aproximatively 400 pages).
General presentation of the DNP3 protocol
Answering the most frequently asked questions about the DNP3 protocol, by the company which created the protocol.
Implementation of an automated electric power distribution system by the Indian Institute of Technology in Kanpur (India).
Last updated : Mai 18nd, 2008.
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