Rockwell-automation FactoryTalk Historian SE 3.0 UniInt Interface User Instrukcja Użytkownika Pobierz pdf (Strona 99)

UniInt Interface User Manual 93

Point Values

1 2 3 4

Time

1 Second

Intervals

…

...

IF1

State

Primary

Backup

Off

Primary

Backup

Off

...

IF1

Heartbeat

IF2

State

IF2

Heartbeat

Time

Action

T+0

Both interfaces are running with IF1 in

the primary role.

T+2.5

IF2 reads the active ID point and IF1‟s

heartbeat point. Both are good, so IF2

discards data older than time 0.5.

T+3

Event A: IF1 updates its heartbeat to 30

because it has lost its connection to the

Historian Server. When the connection

to Historian is lost, the heartbeat for the

interface increments between 17-31

and then back to 17. In this example

the primary interface copy heartbeat

was at 13 for IF1, so the next heart beat

will be 30 if the connection to Historian

is lost.

T+3.5

Event B: IF2 reads the active ID point

and IF1‟s heartbeat point. IF2 still has a

good connection to Historian, so it

transitions to primary and sets the

active ID point to 2.

T+4

Event C: IF1 reads the active ID point

and notices the change to a 2. IF1

immediately transitions to backup.

Overlap data from time 0.5 to 4

Figure 5: Timing chart for failover when the primary interface loses its connection with the

Historian Server.

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 107 108

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