HMI: Human-Machine Interface in Automation Systems

Study Notes

Efficient communication between humans and machines is essential in automation systems.
Human-Machine Interface (HMI) serves as the vital link between humans and machines.
HMI provides graphical interfaces to monitor and control industrial processes or equipment.
HMI presents real-time data and system controls on a single screen.

HMI stands for Human-Machine Interface.
HMI enables operators to monitor and control industrial processes or equipment.
HMI provides access to process data and allows operators to input commands executed by PLCs.

Inputs and outputs are connected to the PLC, and then the HMI is linked to the PLC to carry out tasks.
PLCs are programmed to manage input/output signals and control logic.
HMIs are programmed to create graphical interfaces to monitor and control processes.

DCS is used for large-scale and efficient control of complex processes in modern industries.
DCS consists of multiple controllers distributed throughout a factory to control different interrelated processes.
All controllers are interconnected with other devices, forming a network to control and monitor the whole factory.

In a factory environment, a DCS supervises several areas, each with its own set of inputs and outputs.
DCS enables centralized control and monitoring of different areas across the factory.
A DCS controller is responsible for executing control algorithms, managing input and output signals, and communicating with other devices within the network.
A DCS control room includes components for monitoring and controlling industrial processes, such as engineering workstations, operator screens, and other devices.

SCADA is a system architecture that uses controllers, computers, communications, and graphical user interfaces to monitor and control different processes.
SCADA is used to supervise non-DCS systems within a factory or remotely across different locations.
SCADA construction involves:
1. Data acquisition from various sensors and devices
2. Data communication through wired or wireless methods
3. Data presentation to operators
4. Control of the system by operators