Ignition Historian Question

Ignition
1

Hello,

I'm historizing one tag with Sample Mode as "On Change" and other parameters for History settings are as default.

However, When I tried to fetch the data for that tag, I am seeing multiple rows with different time stamp with the same value.

Tag Type: BOOLEAN

My question is why Ignition is historizing if the setting is Sample at "On Change" and values are same?

Thanks in advance!!!

I'm attaching screenshot for historized data

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image1377×811 171 KB

image
image964×681 89.7 KB

2

My Initial thoughts - your tag is changing in quality.
From the docs @ Configuring Tag History - Analog:

  • The system always stores a value when the quality on the tag changes.