Page History

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The EFM Emerson ROC module is capable of polling history data from a ROC device based on a specified polling rate.  With MQTT Transmission, this history data can be published as Sparkplug records to an MQTT server.  Any client subscribed on Sparkplug RECORD messages can receive these objects.  In addition, MQTT Engine when combined with MQTT Recorder can also receive these messages and store these objects in a configured Ignition database.  The following drawing shows the general architecture used to do this.  This tutorial outlines the process of getting history to the central Ignition gateway.

Sending ROC History to a Central Ignition Gateway:

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MQTT Recorder requires that a database be set up in Ignition. That can be done as described described in the 'Connect to a Database' section here.  Note Ignition supports additional database types.  For more detailed information about supported types, take a look at the information provided here.  Once a database is set up, MQTT Recorder can be configured.  Do so by opening the Ignition Gateway Web UI and browsing to the Configure tab at the top of the screen and then selecting 'MQTT Recorder Settings' as shown in the lower left below.

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