What is HMI?
HMI is an acronym for “Human Machine Interface”, which means communication device between operator and machine. Strictly speaking, any way that a human “communicates” with a machine through an interface screen is an HMI.
Structure of HMI
Hardware:
- Screen: has a touch function so that the operator can touch to control the operations on the screen like we use a touch phone every day. In addition, the HMI screen can also display the operating signals of machinery and equipment.
- Keys: to perform control operations
- Chip: is the CPU of the monitor
- Memory: ROM, RAM, EPROM/FLASH…
Software:
- HMI building tools
- Functions and commands for control
- System software
- Connection tool, installation program
- Simulation applications
Working principle of HMI
HMI is the operating interface between man and machine through PLC, they are connected to each other by signal cable. When the operator presses the button on the screen or sets the parameter, the request will be sent to the PLC, the PLC controls the line machinery.
In contrast, the line machinery system can send the operating status or current parameters to the HMI screen through the PLC to help humans perform the monitoring and control process.
HMI Classification
+ By screen type: HMI touch screen and non-touch HMI screen (TFT, LCD, Touch,..)
+ By size: 3.5 inch, 4 inch, 7 inch, 10 inch, 12 inch, 15 inch,…
+ By memory capacity: 288KB, 1M, 2M, 10M,…
+ By communication port: USB, RS232/422/485, Ethernet, CANBUS,…
+ By communication protocol: MODBUS, MQTT, EtherNet/IP, CANopen, SNMP, FTP, BACnet, M-Bus, ..
+ According to advanced features: SCADA, Cloud, Web Server, SQL,…
What are the advantages of HMI?
+ All mechanical buttons can be replaced with buttons on the touch screen -> Save space, machines will look more compact and professional.
+ It is possible to read operating parameters, observe variation graphs, product statistics, create instructional text and images, pay attention to operation, etc. and many other functions that HMI can do without HMI. can’t do that
What are the limitations of HMI?
+ In applications where a simple push of a button is enough, the use of an HMI will lead to higher costs and, in the event of failure, higher repair costs.
However, in more complex applications that require some features such as the 2nd advantage mentioned above, the use of HMI is a must and for that reason, HMI is a very popular and useful device. is an indispensable part in modern lines and machines.
Applications of HMI
- Manufacturing industry, machine building, upgrading automatic systems and machines
- Manufacturing and upgrading industrial automation lines
- Building automation, control, management, monitoring BMS, HAVC, BTS,…
- Industrial pump control technology, water and wastewater treatment
- Manage and monitor electric energy, oil, gas, gas,…
- Universities, training centers, vocational training
- Smart home
- Environmental monitoring: display, monitor, collect data and monitor remotely
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