HMI stands for human machine interface and is used in industrial settings. HMI systems can be considered a "window" into a process. This window could be present on specialised equipment like operator panels or a computer. To enable information exchange between the user and the system, an HMI system has connections to both the hardware and software components of an industry.
The collection of screens,visual displays,and other technologies utilised by the operator to view and communicate with the control system is knowm as the human-machine interface(HMI).
The HMI receives signals from the process through devices with input/output cards in the computer,such as PLC 35s,RTU 28s(remote units),or drives.All of these devices must have a communication protocol that the HMI can comprehend
HMI software's characteristics include:
MONITORING :
Monitoring is the process of getting instantaneous plant data and displaying it. To make a reading easier to understand, this data can be presented as numbers, text, or images.
SUPERVISION :
In addition to monitoring, this capability also enables the possibility of changing the process's operating conditions from the computer.
ALARM:
The capacity to identify and communicate extraordinary events occurring during a process.
CONTROL :
Control is the capacity to use algorithms that modify the process's values and keep them inside predetermined bounds.
HISTORIAN :
The capacity to show, store, and process data on a regular basis is known as historian. This data storage is a potent instrument for process improvement and correction.
DISPLAY HIERARCHY :
Displays ought to be created in a manner that exposes detail in stages. Displays created from a stack of P&ID schematic designs won't have this; instead, they will be "flat," similar to a hard drive on a computer, with a single folder containing all of the data.
There is a display hierarchy of four levels:
Level 1 -
Operational overview: Often, control interactions cannot be made with overview visuals. It serves as a general gauge of how the business is doing. By monitoring the Key Performance Indicators, it provides a clear indicator of the operation's present performance.
Level 2-
Unit Control: A process is composed of various little units, each of which has its own process system. Every individual main unit operation has a Level 2 graphic. It is intended to include all the data and controls required to let the operator to carry out nearly all tasks related to that segment from a single graphics.
Level 3-
All of the information on a single piece of equipment is presented in Level 3 visuals. They are employed for thorough problem diagnosis. They display information about each instrument, the interlock's status, and other things. For a Level 3 display, a schematic or P&ID kind of representation is frequently preferred.
Level 4-
The most information about a subsystem, a specific sensor, or a component is provided by Level 4 displays. They display the most thorough data on the system and its subsystems.
Built to measure: They are created in graphical programming environments like Visual C++, Visual Basic, Delphi, etc.
HMI canned goods: The majority of the common SCADA system functions are covered by these software packages.
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