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The EFM Emerson ROC module is capable of getting alarm events polling alarms from a ROC device based on a specified polling rate.  With MQTT Transmission, these alarms 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 alarms to the central Ignition gateway.

Sending ROC Alarms 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 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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Once there, select a Datasource as shown in the image below.  This drop-down will be populated with any database connections you have set up in Ignition.  Optionally you can select a Partition Period if you would like tables segregated by time periods.

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At this point, the Central Ignition Gateway with MQTT Distributor, MQTT Engine, and MQTT Recorder is fully configured and ready to receive MQTT Sparkplug messages from the Remote/Edge Ignition Gateway.  MQTT Distributor listens on TCP port 1883 by default for inbound MQTT connections.  Make sure your Operating System's Firewall, Antivirus, and Malware protection services allow inbound connections on port 1883/TCP before proceeding.

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Start by configuring the MQTT Transmission module. Do so by opening Ignition Designer and creating a tag structure similar to what is shown below.

Image RemovedImage AddedNote this structure is based on usage of the 'Default Transmitter' in MQTT Transmission.  So, the directory structure is very important.  Note the structure.

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Next the MQTT Transmission server configuration must be modified to point to the Central Ignition Gateway we set up earlier.  To do so, in the Ignition Gateway Web UI browse to the Configure tab on the top and then to MQTT Transmission Settings in the lower left as shown below.

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Once in the MQTT Transmission Settings configuration, click the Servers tab.  Then click 'edit' on the Chariot SCADA MQTT Server definition.  Modify the URL to match the URL of the Central Ignition Gateway you have configured.  In this example, MQTT Distributor is installed on a Central Ignition Gateway at the IP address of 192.168.1.532.  You should not have to modify any other parameters because MQTT Distributor and MQTT Engine have been left in their default state.  Once you have modified the URL to match your configuration, you should see a '1 of 1' in the Connected column as shown below.

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The next step is configuring the EFM Emerson ROC module.  This is done as described in the Emerson ROC Configuration manual.  In going through the basic setup and configuration for Alarm configuration you must perform the following steps at a minimum.

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MQTT Transmission is connected to the MQTT Server and as a result MQTT Engine is receiving tag change events.  In addition, because an EFM Emerson ROC device has been created and configured with the same Sparkplug Group ID, Edge Node ID, and Device ID, alarm events alarms will also be pushed to the MQTT server as Sparkplug RECORD objects.  When alarm events alarms are discovered by the EFM Emerson ROC driver, they will be published to the MQTT server, consumed by MQTT Engine, passed on to MQTT Recorder, and then inserted into the specified database.  Below is an view of some alarms using a third party database viewing tool.

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