Rockwell-automation FactoryTalk Historian SE 3.0 UniInt Interface User Manual de usuario descargar pdf (Pagina 97)

UniInt Interface User Manual 91

1 2 3 4

Time

Point Values

1 Second

Intervals

...

IF1

State

Primary

Backup

Off

Primary

Backup

Off

...

IF1

Heartbeat

IF2

State

IF2

Heartbeat

Active_ID

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 in its

queue older than time 0.5.

T+2.8

Event A: the active ID point on the

data source is changed from 1 to

T+3

Event B: IF1 reads the active ID

point and IF2‟s heartbeat point.

IF2‟s heartbeat is good and the

active ID has changed to a 2, so

IF1 immediately transitions to

backup.

T+3.5

Event C: IF2 notices that the

active ID point on the data source

is 2 and immediately transitions to

primary. The data in its queue and

any new data are sent to

Historian.

Overlap data from time 0.5 to 3.

Figure 4: Timing chart for a manual failover to the backup interface.

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 107 108

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Rockwell-automation FactoryTalk Historian SE 3.0 UniInt Interface User Manual de usuario Pagina 97

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