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        <div id="content-top1">Page 144 - PLC Automation</div>
        <div id="content-top2">P. 144</div>
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    <pre style="white-space:pre-line"><code>Application descriptions
AC500 HA offers hot standby redundancy

                                                                                                                                                                OPC server

                                                                                            Ethernet

                                                                        Automation Builder                                                                                  CP600 / CP600-eCo
                                                                        engineering suite

     Performance is the key                                             ABB redundant I/O bus
     The high availability of AC500 HA prevents downtime caused         (with CI590)

8 by either human error or cabling/hardware/software malfunc-

     tion. Redundant CPUs and the redundant I/O bus to the
     CI590 module reduce the risk of total system failure, thus
     enhancing system availability.

     If critical data retention and the avoidance of downtime are
     paramount to your application, ABBâ€™s AC500 HA is the per-
     fect solution.

     What are the benefits of AC500 HA for your high availability
     solution?
     â€“ Hot standby: Both CPUs (and all communication or bus-

         lines) are hot: Permanently running in parallel, continuously
         synchronizing each other and monitoring the system. If
         the primary CPU is stopped, powered off or crashed, or if
         a CS31 line is disconnected, the other hot standby CPU
         takes over immediately by adopting primary status.
     â€“ Higher resource utilization, no downtimes caused by cabling/
         hardware/software failure thanks to redundant CPUs and
         redundant communication to I/O and Scada/HMI
     â€“ Cost efficiency and easy system maintenance through the
         use of standard hardware
     â€“ High availability is provided with standard CPUs from
         PM573-ETH to PM592-ETH: Cost matching hot standby
         quality for small or large systems
     â€“ 3 cycles or 50 ms changeover time
     â€“ Scalable: Up to a total of seven redundant l/O-busses via
         CM574 modules offer scalability of large-sized applications.

8/142 | ABB PLC Automation</code></pre>
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