HMI & DCS
A human-machine interface or HMI is the apparatus which presents process data to a human operator, and through which the human operator controls the process.
HMI is usually linked to the SCADA system's databases and software programs, to provide trending, diagnostic data, and management information such as scheduled maintenance procedures, logistic information, detailed schematics for a particular sensor or machine, and expert-system troubleshooting guides.
The HMI system usually presents the information to the operating personnel graphically, in the form of a mimic diagram. This means that the operator can see a schematic representation of the plant being controlled. For example, a picture of a pump connected to a pipe can show the operator that the pump is running and how much fluid it is pumping through the pipe at the moment. The operator can then switch the pump off. The HMI software will show the flow rate of the fluid in the pipe decrease in real time. Mimic diagrams may consist of line graphics and schematic symbols to represent process elements, or may consist of digital photographs of the process equipment overlain with animated symbols
Part 4-HMI (Human Machine Interface) Introduction about HMI Use & Benefits of HMI Types of HMI Introduction about HMI Software Creating Applications Creating Tags Page Jump Creating Alarms Security (login & logout) Boot page (Welcome page) Downloading/Uploading program Communication with PLC Difference between SCADA and HMI Fault finding Part 5-DCS (Distributed Control System) Introduction to DCS Applications of DCS system Architectural evolution for DCS Hardware architecture of DCS -Processor -Power supply -I/O modules -Communication bus -Operator and Engineering station -Redundancy Comparison between the hardware PLC & DCS Sinking | Sourcing concept of control logic.
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