Detection of stale data, Uniint failover, Interface status tags – Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide User Manual
Page 26: Internal state status
Principles of Operation
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between reconnection, and number of reconnection attempts are all user configurable
parameters.
Note: the default network timeout period is 60 seconds. This is not an interface
configuration parameter. This is configured through the PI API configuration file,
pilogin.ini. Please refer to the PI API Users Manual for information on adjusting the
default timeout period.
Detection of Stale Data
The second failover condition is stale source data. The Historian Interface Status Utility is
required on each source server to track data quality. This utility is a separate program that
monitors updates to a specified watchdog tag. The utility updates a status tag to indicate
whether or not the watchdog tag is being updated. The interface monitors this status tag as an
indicator that source data is current. When configuring the Interface Status Utility users will
want to select a watchdog tag that receives reliable high frequency updates.
Whenever possible the interface is connected to a source Historian Server that is actively
receiving data. If this is not possible, the interface enters a loop where it waits for the first
available source Historian Server receiving data.
Note: The Historian Interface Status Utility is not included as part of the interface
installation. It is available for downloaded on our website;
UniInt Failover
This interface supports UniInt Phase 2 failover with warm failover configuration. Refer to
section
of this document for configuring the interface for
failover.
Interface Status Tags
The interface has the optional functionality of outputting status data to a digital tag. There are
two optional status tags that are mutually exclusive. These are digital tags that are created on
the receiving Historian Server. These tags are useful for tracking performance and assisting
with troubleshooting.
Internal State Status
The interface updates the internal state tag to indicate when it executes specific functions.
Specifically, the status will indicate whether the interface is in startup, performing history
recovery, scanning for data, experiencing network communication errors, denied data or point
access (security permissions) or performing shutdown operations. This functionality is
enabled by specifying an internal state status tag in the interface startup script.