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MQTT (originally an initialism of MQ Telemetry Transport [a]) is a lightweight, publish–subscribe, machine-to-machine network protocol for message queue/message queuing service. It is designed for connections with remote locations that have devices with resource constraints or limited network bandwidth , such as in the Internet of things (IoT).
MQTT-SN v1.2, standardized by IBM. [65] MQTT v3.1, standardized by Eurotech and IBM. [66] MQTT v3.1.1, standardized by OASIS. [67] [68] MQTT v5.0, standardized by OASIS. [69] The following table lists the versions of MQTT that each implementation supports, and also lists their support for SSL/TLS and TCP.
In smaller SCADA systems, the supervisory computer may be composed of a single PC, in which case the HMI is a part of this computer. In larger SCADA systems, the master station may include several HMIs hosted on client computers, multiple servers for data acquisition, distributed software applications, and disaster recovery sites.
The HMI/SCADA Module Layer contains mainstay products of the Ignition Platform. Vision is the main visualization module, SQL Bridge is a bidirectional OPC to SQL database historian and transaction manager, Reporting generates dynamic Pdf reports, and Mobile allows access to HTML 5 compatible devices such as iPads, iPods, Android, Smartphone ...
After more than three years of specification work and another year for a prototype implementation, the first version of the Unified Architecture was released in 2006. [4] The current version of the specification is on 1.04 (22 November 2017 [5]). The new version of OPC UA now has added publish/subscribe in addition to the client/server ...
The computer technology is also referred to as SCADA/EMS or EMS/SCADA. In these respects, the terminology EMS then excludes the monitoring and control functions, but more specifically refers to the collective suite of power network applications and to the generation control and scheduling applications.
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