High Availability Theoretical Basics - Schneider Electric
High Availability Theoretical Basics - Schneider Electric
High Availability Theoretical Basics - Schneider Electric
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Conclusion<br />
<strong>High</strong> <strong>Availability</strong> with Collaborative Control System<br />
Each cluster contains only one pair each of ATR servers. Those pairs of servers,<br />
redundant to each other, must be on different machines.<br />
Each cluster can contain an unlimited number of I/O servers; those servers must also<br />
be on different machines that increase the level of system availability.<br />
The following illustration shows a complete installation. Redundant solutions<br />
previously discussed can be identified:<br />
Scada Clients<br />
Data Servers<br />
Control Network<br />
Targeted Devices<br />
Communication Infrastructure Level<br />
The previous section reviewed various aspects of enhanced availability at the<br />
Information Management level, focusing on SCADA architecture, represented by<br />
Vijeo Citect. This section covers <strong>High</strong> <strong>Availability</strong> concerns between the Information<br />
level and the Control Level.<br />
A proper design at the communication infrastructure level must include:<br />
• Analysis of the plant topology<br />
• Localization of the critical process steps<br />
• The definition of network topologies<br />
• The appropriate use of communication protocols<br />
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