PLC (Programmable Logic Controllers) has become the soul of industrial automation as it is the hardware component directly in contact with the field instruments. It gives the access to control and monitor the array of connected machinery and the software system integrated with it. The PLC system can work with a variety of communication protocols like data conversions, i/o interfacing, signal processing, etc. The system is user programmable, i.e., you can set triggers on different parameters like temperature, liquid level, opening or closing of valves, etc.
A PLC linked with graphical displays such as an HMI are key components of the broader concept of SCADA. Both these phenomena help propel the applicability of SCADA systems across different industrial sectors.
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