Rockwell Automation 1757-SWKIT4000 ProcessLogix R400.0 Installation and Upgrade Guide - Manual (Page 263)

Publication 1757-IN040B-EN-P - March 2002
Performance and Capacity Specifications 11-11
Server Redundancy
Database synchronization is performed as a background activity
and is performed online without affecting the operation of the
Servers. Time to perform synchronization will depend on the
system configuration (e.g., database size, history, processor
speed).
Server Notifications
Table 11.H Server redundancy specifications
Server Redundancy
Server Switchover Time – Default 30-40 sec
Server Switchover Time – Fastest Configurable Time 10 sec
On Server switchover, the 1757-PLX52 performs an event recovery. This causes the
controller to report all current alarm conditions. The Server will report all current process
alarms and events.
Table 11.I Server notification specifications
Server Notifications
Maximum number of events
(1)
(burst condition)
500 events
Maximum number of events/second
(1)
(sustained)
40/sec
Maximum number of alarms/second
(1)
(sustained)
20/sec
(1)
Up to two events are also generated for every alarm, including one event for entering the alarm condition and one for
return to normal.