Envision a centralized hub sitting between all your enterprise systems that converges and delivers data in such a way that only those who need particular “atoms” of data can access them. No matter how big or small the importance of the decision is, or how granular the data, whichever user needs it, they get it as it occurs. Alarms and notifications delivered to any devices with interaction/control mechanisms at hand. This is the power of Ignition with MQTT!
By leveraging MQTT and Ignition, you can decouple intelligent devices from the plant floor or industrial applications and make that data available to anyone in the enterprise.
Message Queuing Telemetry Transport (MQTT) is a machine-to-machine oriented lightweight bi-directional publish/subscribe messaging protocol based on TCP/IP protocol stack. MQTT's architecture is based on client/server architecture.
Clients publish messages to the server, also known as a broker, receives these messages and distributes them between subscribers. Broker decouples publisher and subscriber acts as a message router. MQTT supports one-to-one, one-to-many, and many-to-one communication.
The MQTT message is a unit of information that is exchanged between publisher and subscriber. The MQTT protocol specification has the message Topic namespace and the Payload. The message Topic works as an address and has hierarchical structure, like a file system. MQTT doesn’t dictate any particular Topic and Payload structure or encoding. MQTT supports three quality service levels: “fire and forget,” “delivered at least once,” and “delivered exactly once.” The Sparkplug B specification provides topic namespace structure and encoding, a mechanism for state management and a payload structure and encoding.
MQTT’s one-to-many function facilitates the use of message-oriented middleware (MOM), which allows you to decouple the edge-of-network devices from the applications that consume the data. This decoupling of devices from applications is positively impactful in regards to scalability, system performance, and centralized visibility while requiring simple to add security measures.
Ignition is the world’s leading HMI, SCADA, and MES software development platform from Inductive Automation which delivers a device-agnostic, fully scalable OT/IT solution with unparalleled plug and play services.
Implementations and migrations have never been faster. Leveraging the full power of the Ignition universal industrial automation platform and the MQTT middleware infrastructure defines a true IIoT solution unlike any other on the market today.
Ignition is the only IIoT platform with full-featured SCADA functionality built-in. Ignition is the world’s first truly universal industrial application platform. It empowers each user to connect IIoT data across an entire enterprise, rapidly develop automated systems, and scale in any way you need.
Ignition SCADA provides full support of MQTT via stand-alone MQTT modules including Engine MQTT, Transit MQTT, Distributed MQTT, and Ignition Edge. Easily download and install each module onto the Gateway.
One Ignition Gateway can combine various modules, for example MQTT Distributor and MQTT Engine can be used all together, so one gateway can serve as MQTT Broker and client simultaneously.
The Inductive Automation platform and MQTT modules can be resilient to failures when configured to use redundancy. Redundant Ignition systems are often set up to act as failover backups for primary/master Ignition instances. Redundancy is set up and managed in the Gateway. Thus, in case of lost connection, Ignition MQTT publishers will store and forward the data from a RAM or hard drive.
Ignition MQTT solution can share data with major cloud providers like AWS, Google Cloud, Azure, and IBM Cloud via Cloud Injectors modules. Cloud Injector pushes Tag data to the cloud database including Tag metadata, UDTs and Tag values. To emphasize, the module will send all data or a specific subset of data. As the Tags change, the events adjust and are consumed by the module and sent to the cloud.
With PLCs connected via Ignition MQTT Edge devices and Ignition Gateway with MQTT Transition module. These PLCs publish messages to standalone MQTT Distributor. Ignition Gateway with MQTT Engine subscribes to the MQTT Broker.
Comparatively, the two gateway approach is one serving as the MQTT Broker and MQTT Client simultaneously using MQTT Distributor and Engine modules; and the second connected to PLCs utilizing MQTT Transmission module to publish changes to MQTT Broker.
Furthermore, security is another aspect of IoT applications that is critical and found in almost all layers of the IoT protocols. Threats exist at all layers including the data link, network, session, and application layers.
In this section, we briefly discuss the security mechanisms built in the Ignition MQTT. MQTT Edge, Ignition MQTT Distributor, and MQTT clients share the same security model. Also, MQTT's connection between client and broker runs over TCP/IP using TLS protocol for establishing connection and encryption.
With the MQTT network architecture, MQTT clients can disable all inbound TCP ports. This configuration is the most secure. It prevents any potential attacks from the internet. Basically, access to the MQTT client is secure via reverse VPN.
The MQTT server shares the same security configuration TCP/IP over TLS as clients, moreover utilizing MQTT level username, password and Access Control List measures.
Additionally, The ACL controls what topics a given username/password pair can publish-subscribe on providing further security. The MQTT broker should be setup in a DMZ and behind the firewall with ports 443 and 8883 open for inbound connection.
In summary, every aspect of the MQTT protocol is configurable via Ignition modules as well as integrating third party solutions. The architectures outlined above represent a cost-effective solution for an organization to build their IIOT transformation.
The Ignition/MQTT combo pack eliminates time spent on connecting and describing PLC’s tags, values and metadata as well as minimizes the time of deploying the MQTT Broker and Clients.
Overall, with minimal risk and cost, this solution enables OT data consumption with simple configurations on proven software tools that securely bridge the IT/OT gap. This provides contextual information for the data scientist to use Big Data Analytics, Machine Learning, Artificial Intelligence to gain insight and increase productivity and profit.
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