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The EFM Emerson ROC module is capable of 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.
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We must configure a total of five Cirrus Link modules on two different Ignition gateways to get alarm data flowing from an Emerson ROC device to a central database. These are:
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The configuration of each of these modules is covered below based on the Ignition gateway they're installed on.
MQTT Distributor can be left in its default configuration. Note in a production system you would likely want to set up TLS especially if MQTT connections are using the Internet.
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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'. 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.
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 the Operating System's Firewall, Antivirus, and Malware protection services allow inbound connections on port 1883/TCP before proceeding.
With the Central Ignition Gateway ready to receive MQTT/Sparkplug RECORD objects, the EFM Emerson ROC and MQTT Transmission modules can be configured on the Remote/Edge Ignition Gateway.
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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, alarms will also be pushed to the MQTT server as Sparkplug RECORD objects. When 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 a view of some alarms using a third party database viewing tool.
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