Redundancy Control - Toshiba TOSDIC-CIE DS Instruction Manual

2. Functions

Redundancy Control

For redundant OIS(SVR), online/standby is switched when the online OIS(SVR) goes down.
Switching is performed when;
1) online/Stand-by is switched manually.
2) operation of the online OIS(SVR) stops, or
3) an error occurs in the online OIS(SVR), which becomes a stand-by OIS(SVR).
Table 2.3 shows the redundant functions in the redundant system.
Historical Database
Report Database
Internal Process Tag
Event Condition
Control
History Message Save Save
History Message Print
External Alarm Output
The time it takes to mirror the Historical Database, Report Database, and history messages
depends on the number of mirrored data items.
If the standby or online OIS(SVR) goes down again during mirroring, mirroring is not performed
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Table 2.3 Functions and Operations of Redundant Systems
Function
Collection
Save
Mirroring
Read
Filing
Maintenance
Mirroring
Read
Data Save
Alarm Occurrence
Mirroring
Read
Event Condition
Registration
Event Occurrence
Mirroring
Read
Print
Diagnosis
Digital tag Output
Mirroring
Operations of Online/Standby SVR
Collected by online and some standbys
Performed by both online/standby
Performed when recovered from down of
standby
Read from online
Performed by both online/standby
Performed only by online
Performed when recovered from down of
standby
Read from online
Performed by both online/standby
Performed only by online
Performed when recovered from down of
standby
Read from online
Performed by both online/standby
Performed only by online
Performed by both online/standby
Performed when recovered from down of
standby
Read from online
Performed only by online
Shared printers are diagnosed individually
Performed only by online
Performed when recovered from down of
standby