KROHNE Summit 8800 Vol 2 - Manual (Page 175)

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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 REDUNDANCY 14
Figure 198 Global redundancy
Enable redundancy Set Enable to “Yes” to use the redundancy feature
Default state Set the initial state of this flow computer position as standby, duty or not
used
Switch over Set the value for the health difference between the flow computers to switch
over
Switch over time Set the time the difference must exist before switching over
Written time deviation Maximum defined allowable time deviation between the other and the
system time
Redundancy alarm
score
The penalty for a redundancy alarm, e.g. a comms alarm.
Clash alarm time Sets a time period allowed for switching of duty/ stand-by before an alarm is
raised.
14 .3 Redundancy Parameters
These pages deal with the essential flow measurement to determine the health of the system.
Penalty points can be assigned to measurements that are failing. A complete healthy system is
100% healthy, any of the failures lower its health by the value entered with the measurement.
The measurements are grouped in four area’s:
Redundancy alarm The penalty for a redundancy alarm (see global redundancy)
The meter. All essential measurements to calculate the flow
The chromatograph The penalty for a failing chromatograph
Valves The penalty for failing valves
Slots The penalty for alarms for the 6 slots, such as hardware failures
or when an inserted board does not match the configured board