Datalogs
All SCADAPack RTUs have a data logging feature. Using this feature, data can be stored in non-volatile memory for later retrieval. The MQTT Application can publish time stamped data from up to 4 datalogs. However, the Publish Format must be Sparkplug B to use this feature. Additionally, the first field in each datalog must be a timestamp.
We recommend using the SCADASuite Datalogs application to create and manage the datalogs on the RTU. Using this application will ensure correct formatting of the datalog, and comes with the additional benefit that datalogs and values will be published using user configured names, instead of generic names.
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Datalogs can only be published if the Publish Format is Sparkplug B and the first value in each datalog is a timestamp.
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When the Datalog Application is also on the RTU, each value from a datalog will be published under the [datalog name]/[value name] tag, where [datalog name] and [value name] are user configured group names that are read from the Datalogs application. For example, if a datalog is named 'meter values' and holds two float values, and the names of the Monitored Value Floats are 'differential pressure' and 'static pressure', the values will be published under the 'meter values/differential pressure' and 'meter values/static pressure' tags.
When the Datalogs application is not available, then each value from the datalog will be published under a generic tag name that looks like datalogXX/valueYY, where XX is the datalog number and YY is the field number. Additionally, boolean values are actually stored as an integer in datalogs. As such, boolean values will be published as integers when the Datalogs application is not available because there is no context available as to whether a given value is a digital value or an integer value. When the Datalogs application is available, then the MQTT application can see from the Datalogs application which values are digitals, so this problem will not occur.
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Use the Datalogs application to get additional context about the logged values. This allows you to use meaningful tag names.
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The first value in a datalog must be a timestamp. All values in the same record will be published with that timestamp. The MQTT application can only publish boolean, integer and floating point values. Additional timestamps other than the timestamp in the first column and double precision floating point values are not supported.
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Ignition expects timestamps to be UTC values. Set the clock on the RTU to UTC to have timestamps appear correctly in Ignition
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Datalogs Group - Configuration Parameters
