1/3/2019 11:26 AM | |
Posts: 27 Rating: (0) |
What is the main difference between scada and hmi? |
1/3/2019 4:04 PM | |
Joined: 9/27/2006 Last visit: 9/21/2024 Posts: 12282 Rating: (2684) |
Hello cart; In the early days of modern automation, because of the lower power of electronic systems that are available today, it was standard to distinguish between: - HMI, human-machine interface, which basically is an operator panel giving control of plant machinery and systems to an operator on the plant floor. It replaced button panels that preceded them. It allowed control of start/stop, auto/manual (for example) signals to the operator on its screen, and displayed error and alarm statuses for machine operation and diagnostics. -SCADA, supervisory control and data acquisition screens, which were computer units generally placed in the operator office, outside of the plant floor, in air-conditionned rooms (computers were much more delicate units then industrial HMIs). It offered control screens (similar to those of the plant floor HMI) but additionally interfaced with databases so historical data could be collected and preserved and studied outside of real-time operations. You could also have add-on programs for statistical analysis, historical alarm collection, communication drivers, etc... Today the differences between the 2 types of systems are getting muddled, as HMI panels become more powerful and can collect data and display pdf or Excel files, and supervisory computers get more robust and are now found on the plant floor (still in protective cabinets due to environmental issues, of course). For more detailed descriptions of these systems, a simple web search will locate many articles and discussions on the subject. Here is one: https://www.quora.com/What-is-the-difference-between-SCADA-and-HMI Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 1/3/2019 5:45:23 PM |
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12/19/2019 2:24 PM | |
Posts: 3 Rating: (0) |
Are HMI and SCADA related to each other? HMI and SCADA two terms for distinct industrial automation interfaces. HMIs are subsets or components of a SCADA system. Additionally, a DCS or Distributed Control System is very similar to a SCADA system, and may also use one or more HMIs as well. All these components are classes of, or describe parts of, an ICS or Industrial Control System, which is the general description of Automation. In modern control systems, there is a great deal of overlapping technology and functionality between these two classes of ICSs. HMI or Human Machine Interface is simply the way by which humans interact with machines. An HMI in terms of the InduSoft Web Studio platform is a control panel that is easily designed, implemented, and maintained/modified simply by creating or modifying it in the InduSoft Development Environment. Using InduSoft Web Studio SCADA/HMI software to design HMIs can save months of development, rework, and rewiring time over creating (a) hard-wired control panel(s) or machine interface panel(s). Software HMIs will securely operate in runtime on a host machine (application server) or as a Thin Client using Microsoft® Internet Explorer or in InduSoft’s Secure Viewer on a variety of displays or multi-displays, devices, and platforms as a built-in interface, a portable interface, or a handheld interface and display terminal. A SCADA (Supervisory Control and Data Acquisition) System is an Automation or Industrial Control System that may involve, directly control, or communicate with one or more of the following: Networked industrial automation and machines Remote telemetry and control using continuous or burst communications Process Control and Statistical Process Control systems Data Acquisition Systems (DAQs) Historians and Data Storage Servers Industrial Control Systems utilizing PLCs and RTUs. Business environment systems such as ERP4 and MES5 Systems. Industrial Cloud Computing Environment Security Systems and Processes local machine security or process security and control Enterprise or global level involving LDAP and other connectivity. A SCADA system may be continuously connected to all the components in the ICS, or may be intermittently connected to some or all, and updated with a burst communication over the radio or cellular modems (2G, 3G, or 4G, CDMA, and GSM technologies) to field devices and equipment. A SCADA system usually has a one or more SCADA Servers containing an application that is/are communicating with and running in conjunction with intelligent single-purpose intelligent components such as PLCs and/or RTUs, or possibly even remote, independent SCADA systems. InduSoft Web Studio serves as a SCADA software platform on which to design an effective SCADA system. An Industrial Control System as described may be connected together via (one or more of the following) serial connections, proprietary and/or Ethernet network, LAN, WAN, and/or Cloud and may involve widely dispersed external components and/or facilities; include processes such as MES and ERP Systems, Process Control and Data Historians, JIT and other upstream/downstream manufacturing connectivity, etc. A DCS or Distributed Control System is similar to, and in some cases, can be indistinguishable from, a SCADA system but is generally considered to be a more self-contained process control type of automation. A DCS usually has a Control Server hosting the Supervisory Control System with the possibility of various SCADA Servers and/or Master Terminal Units or Master Telemetry Units (MTUs) communicating with PLCs, RTUs, Process Historian and/or other business entities as discussed in SCADA systems. DCSs can also be used in Continuous and Batch-based Process Control, and may or may not have proprietary components throughout the whole system. HMIs, SCADA, and Control Systems developed using InduSoft Web Studio SCADA/HMI software are used within many types of vertical industries, large and small, in order to provide a means of direct process and machine control, automation, security, data storage and analyses, indirect operation services such as ingress/egress control, communications and video; and connectivity to a variety of functionality within the system or manufacturing and supply chain that may be closely or loosely associated with the operational or manufacturing of those products and services.
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