Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 137)

FactoryTalk Historian To Historian Interface User Guide 131
[UI_SCINSCANTIME]
You can create a [UI_SCINSCANTIME] Health Point for each Scan Class in this Interface.
The ICU uses a tag naming convention such that the suffix “.sc1” (for example,
sy.st.etamp390.E1.Scan Class Scan Time.sc1 ) refers to Scan Class 1, “.sc2”
refers to Scan Class 2, and so on.
A particular Scan Class‟s [UI_ SCINSCANTIME] point represents the amount of time (in
milliseconds) the interface takes to read data from the device, fill in the values for the tags,
and send the values to the Historian Server.
The Interface updates the value of this point at the completion of the associated scan.
[UI_SCINDEVSCANTIME]
You can create a [UI_SCINDEVSCANTIME] Health Point for each Scan Class in this
Interface. The ICU uses a tag naming convention such that the suffix “.sc1” (for example,
sy.st.etamp390.E1.Scan Class Device Scan Time.sc1 ) refers to Scan Class 1,
“.sc2” refers to Scan Class 2, and so on.
A particular Scan Class‟s [UI_ SCINDEVSCANTIME] point represents the amount of time
(in milliseconds) the interface takes to read data from the device and fill in the values for the
tags.
The value of a [UI_ SCINDEVSCANTIME] point is a fraction of the corresponding
[UI_SCINSCANTIME] point value. You can use these numbers to determine the percentage
of time the interface spends communicating with the device compared with the percentage of
time communicating with the Historian Server.
If the [UI_SCSKIPPED] value is increasing, the [UI_SCINDEVSCANTIME] points along
with the [UI_SCINSCANTIME] points can help identify where the delay is occurring:
whether the reason is communication with the device, communication with the Historian
Server, or elsewhere.
The Interface updates the value of this point at the completion of the associated scan.
I/O Rate Point
An I/O Rate point measures the rate at which the interface writes data to its input tags. The
value of an I/O Rate point represents a 10-minute average of the total number of values per
minute that the interface sends to the Historian Server.
When the interface starts, it writes 0 to the I/O Rate point. After running for ten minutes, the
interface writes the I/O Rate value. The Interface continues to write a value every 10 minutes.
When the interface stops, it writes 0.
The ICU allows you to create one I/O Rate point for each copy of this Interface. Select this
Interface from the Interface drop-down list, click IO Rate in the parameter category pane, and
check Enable IORates for this Interface.