Questions & Answers Category

Bar Chart Question! V25.5

How do I configure a bar chart to only show the current values of the selected tags? I'm thinking a special combination of AggregateInterval, AggregateKind, TimeDuration, and TimeStart.…

Backfill to roll-over hdb3 files

I'm trying to backfill a year's worth of data for about 30k tags across two datasets using the gRPC write API extension methods. I'd like to backfill these into two new backfill datasets with daily…

0 Time Event

This might be the wrong question, but is there a way to create an event that is 0 seconds long? Background - we have a use case where valves can direct product to one of 4 tanks.…

Merge Tags at file level

Is it possible to merge history (within the same dataset) by adding new hdb3 file to the data set? I see tags can be merged at the Views level which is a great option in many scenarios: https:…

Multistate Tags using metadata properties

Could I please get some more details around the options for multistate tags (enums): ie 0=Off, 1=On, 2=Disabled, 3=Emergency stopped I see Axiom has a State Drawing mode for a tag - is it possible to…

How does DurationSinceLastTVQ resolve the 'last TVQ' in periodic/subscription Event jobs?

Is there any documentation that explains exactly how DurationSinceLastTVQ determines the `last TVQ` when used in periodic or subscription Calculation/Event jobs?…

Store and Forward - Change buffer location

Is it possible to change the buffer and other SaF locations? On many servers the client wants to avoid buffered data on the system drive (C:) incase it fills up and crashes the server.…

Licensing — Dual Historian (Both Historizing) with SaF Proxy Forwarding

My client wants to add a local Canary instance to their site and I have a question on licensing, license configurations and Historian Configuration. They were led to believe they do not need any…

• Answered

Axiom Displays - Move to a new Server

Hi There, I have a client deploying a new Canary Server (local instance) and they want to copy/move the Axiom displays that were created on the off-prem Canary Server.…

Error loading Sender UI

Hello community! After configuring the Sender, when I navigate to the Sender UI, I get "Something went wrong". This happens with both the HTTP and HTTPS endpoints.…

AXIOM - Unexpected exception occurred. Value cannot be null

Hello, A few days ago, this error message started appearing in some of our Axiom applications, where I display value boxes with conditions (an “if” equation in a calculate control) that depend on the…

File automatic removal after CSV collector does its job.

After saving data to historian through CSV collector, the completed CSV files are automatically moved into 'Completed' folder. I'm wondering if there are any Canary built-in features I can use for…

Kepware Server Configuration

Has anyone setup Collector to read tags from Kepware Server OPC UA?

Axiom Value Box with a calculated time delay

Hello, I am attempting to create a value box that has a time delay behind another value box directly tied to a received value. Here are some specifics. Consider four Value Boxes:…

What's the UoM for the Duration within the Events database?

Hello Canary team What's the UoM (or business logic) behind the duration attribute of the Events table within the Events database? Below are examples of a 1 second duration,…

• Answered

OPC/Custom Functions for Calc Server Error

When I create an application and use the DeltaTotalCount aggregate with the end time in the future (based on the duration and start time) The calculation seems to truncate to Now and works fine.…

How to Remove OPC Collector Sessions

Hi I'm new to the Canary sphere, and am trying to figure out how to remove Sessions that are no longer in use from the OPC Collector tile, and in the OPC Collector window.…

• Answered

Intermittent gRPC Ingestion Failures Between Store & Forward and Historian

We are experiencing intermittent issues between two Store & Forward (S&F) nodes and our Canary Historian. The S&F services intermittently fail to start or maintain their gRPC connections to the…

Axiom list box IsMultiSelectEnabled

Hello, I'm using a list box to configure a grid template filter. When IsMultiSelectEnabled = false the item boxes change from a checkbox to a radio button, implying one option must always be selected.…

• Answered

Repeated "View not found" errors logged

Hello... I'm seeing clusters of repeated errors logged in Messages saying "View not found" and referencing two other server names (not the local Historian's name).…

Event Hash and ID

We've been looking at pulling Events via the API. Here is a sample response from our system. We noticed there is an ID and a Hash. I don't see any documentation on what those represent.…

AxiomCore2 EventManager+CacheableBatchEventsRequest was not present in the dictionary

We keep receiving the following error when navigating to any tab in this particular application. first two tabs are basic trends, third tab is an events table that seems to be populating fine.…

Events Table Control - manually format properties

Hi all, using the events table control (v25.3) I would like to manually define the property's format, similar to the question by James Wise. I couldn't find any documentation on formatting the values…

Calcs string comparison like

I have a use case where I need to start an event when a flare pilot goes out. For whatever unknown reason, statuses are sent to us in string. And they're not uniform.…

Axiom Extrapolation?

We have a scenario where a tag may only have a single timestamp with value until membranes are replaced in the future. We want to see this data point as an extrapolated value from the entry point to…