New Cogent White Paper Simplifies Redundancy for OPC
A free white paper from Cogent gives an overview and
practical tips for planning an OPC-based redundant
Georgetown, Ontario (June 21, 2011) Cogent Real-Time Systems announces the release
of of a new white paper titled "Redundancy
for OPC" that provides background information and
practical considerations for plant engineers and managers
interested in implementing redundancy in a data communications
network based on the OPC protocol.
The paper defines basic redundancy concepts such as cold,
warm, and hot standby, seamless and smart switchovers,
fallbacks, and object and link monitoring. It also points out
common design problems like the timer pitfall and forced
switching, and gives useful advice on how to get the best value
in a redundancy manager.
"As system up-time becomes more critical to financial
success, many plant engineers are looking at adding redundancy
to their mission critical control systems," said Andrew Thomas,
President of Cogent. "This paper is helpful for anyone
interested in getting quickly up to speed on the main issues, so
that they can make informed decisions."
The OPC protocol is a Windows standard for real-time data
communication in industrial automation processes. Stated
briefly, redundancy for OPC is typically implemented with two
redundant OPC servers connected to a single OPC client, through
some kind of redundancy manager. When the data from one OPC
server becomes unreliable for some reason, the redundancy
manager switches to the other OPC server.
Although the concept is straightforward, implementing
redundancy in an OPC-based system requires a good understanding
of what's at stake. A poorly implemented solution can mean
delays, data loss, and overuse of system resources. Whether
someone is currently using a redundant system, planning to
implement one, or simply wants to broaden their understanding,
Cogent's free "Redundancy for OPC" white paper provides useful
Founded in 1995, Cogent Real-Time Systems
provides versatile and reliable middleware products to enable
real-time data integration and access for industrial, embedded,
and financial systems. Customers include Siemens, ABB,
Honeywell, IBM, GE, Statoil, Goodyear, BASF, Cadbury Chocolate,
and the Bank of Canada.