SCADA system and features of SCADA Software

In early years of industrial automation, PLC system used to function like black boxes. Once you develop a program in PLC programming software, download the program in PLC System, it used to run for years. Problem with this arrangement was that we never knew what is going on inside the PLC system. Today industrial automation systems come with PLC SCADA software. By using PLC SCADA software combination we can have better monitoring and control of the plant, at the same time we can have access to process information. SCADA system enables plant operators, handlers, engineers, managers to view and interact with the working of entire plant operations through mimics/graphical representation.

PLC SCADA software is loaded on a PC and is connected to various PLC systems and other field devices. SCADA system regularly collects data from the plant in real-time, stores and processes the date, analyses and generates alarms and events and displays information to plant handlers, supervisors and managers and also issues instructions to PLCs on the plant floor.

WHAT is TAG in SCADA System?

A tag database consisting of records are called tags. In the tag database you define the data you want SCADA software to monitor. If you have several machines with similar function and they all require the same tags, you can create a folder called M1 and define its tags. To create the tags for M2 you will have to use duplicate Folder command and specify M2 as the folder name. This creates a folder called M2 containing all the tags that are in the folder M1. Tags can be 3 types: digital, analog and string.

Features of SCADA software

Dynamic Process Graphic: Graphics/mimics developed in SCADA software should resemble the actual process equipment. SCADA software generally have good library of symbols for developing the mimics as per requirement. Once the operator sees the SCADA screen he should understand what is going on in the plant.

Real time and Historical Trend the trends play very important role in SCADA Software. Whenever any production batch fails or the plant trips, historical trend data helps production managers/handlers of the plant in analyzing the causes.

Alarms warn the operator when something goes wrong. An alarm indicates that process has stopped operating within acceptable, pre-defined limits or it has broken down. Alarms have important role in PLC SCADA industrial automation. Generally SCADA System has alarm like temperature should not cross 70 deg or lever should be less than 50%, So if the parameter goes beyond Alarm State the operator should be informed with the visual or audio alarm. Alarms are most important part of plant control operations, the operator must know instantly when something goes wrong.

Recipe Management Most of the SCADA software come with this feature. This feature is useful in plants manufacturing multi products. You just have to load the recipe of that particular product, production will be as per the recipe. There are many plants in India today, who receive recipe from their parent plant overseas, days production is based on the recipe.

Security is very critical feature in PLC SCADA Software. You can allow certain access levels to the operator, process handlers, engineering & maintenance dept. for example operators should be able to only operate the system, he should not be allowed to change the application. The design engineers should authority to editing/changing the application.

Device connectivity Today there are scores of manufactures of PLC SCADA Software. SCADA software should be such that it is easily connected to all types of hardware/software. Since a plant/manufacturing unit may have PLC SCADA from multi brand. The best SCADA software is the one which is easily connected to all PLC SCADA brand of multiple manufactures.

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