Rockwell Automation FactoryTalk Historian SE 3.0 UniInt Interface User Guide - Manual (Page 82)

UniInt Failover Scheme
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Parameter Value Description
Host Historian Server
for Exceptions and
Historian tag updates
Computer:
IF-Node2
/Host=SecondaryPI
to send data to a Historian Server collective, the
value of the /host parameters should equal
different members of the collective.
This configuration will ensure output continue to
be sent to the Data Source if one of the
Historian Servers becomes unavailable for any
reason.
If the redundant interfaces are being configured
to send data to a Historian Server collective, the
value of the /host parameters should equal
different members of the collective.
This configuration will ensure outputs continue
to be sent to the Data Source if one of the
Historian Servers becomes unavailable for any
reason.
Data Source Points
The following table lists the points that are required on the Data Source with the values that
will be written to the points and comments describing the points.
Point Value Description
Active ID Point Updated by the
redundant Interfaces
Can be changed
manually to initiate a
manual failover
Values range between 0
and the highest of the
Interface Failover IDs
(typically 2)
The Active ID Point on the datasource is used
by the interfaces to determine which interface is
currently sending data to Historian. This point
on the Data Source must be initialized so the
interfaces‟s first read of the value is not an
error.
The Active ID Point may be used to initiate a
manual failover. If the current value of the
Active ID point is 1, the value can be manually
changed to a 2 which will cause the interface of
IF-Node1 to transition to the backup role and
the interface of IF-Node1 to transition to the
primary role.
Heartbeat 1 Point Updated by the Interface
on IF-Node1
Values range between 0
and 31
The Heartbeat 1 Point on the Data Source is
updated periodically by the interface on IF-
Node1. The interface on IF-Node2 monitors this
value to determine if the interface of IF-Node1
has become unresponsive.
Heartbeat 2 Point Updated by the Interface
on IF-Node2
Values range between 0
and 31
The Heartbeat 2 Point on the Data Source is
updated periodically by the interface on IF-
Node2. The interface on IF-Node1 monitors this
value to determine if the interface of IF-Node2
has become unresponsive.