PLC stands for PROGRAMMABLE LOGICAL CONTROLLER, as the name itself defines, it's a controller of a logical program. You can write the program in a specific application, like for siemens plc you can write the logical program using step-7 /Simatic manager.
PLC will control the output based on the logic you have written in program.
There are different kinds of features of controller which are:
A PLC is basically a custom industrial embedded computer. It is designed to monitor digital or analog signals, perform logical operations on them and subsequently trigger specific output signals.
Disadvantages of PLC system:
Disadvantages of the PLC system purely depend on your requirement. Source the right equipment to satisfy your requirement.
Controllers absolutely don’t have any disadvantages, rather it's the understanding gap between the supplier and the user. Controllers are evolving very much to replace their own conventional design.
Advantages of PLC system:
Plc has a lot of advantages if u are comparing it with any embedded or something as plc can be programmed as many times as possible according to user convenience, we can connect thousands of inputs and output depending upon the type of plc we choose and its scan time is also 0.1ms which will be sufficient for any system to process perfectly
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Need of PLC:
PLC is needed so as to have the following tasks:
The difference between PLC, DCS, and SCADA:
PLC - Programmable Logical Controller (Digital computer device)
DCS - Distributed Control System ( Network of Interconnected devices including a number of PLC’s )
SCADA - Supervisory Control and Data Acquisition ( software for industrial control system )
PLC manufacturer provides a specific SCADA software to control their PLC
Ex- for OMRON PLC the SCADA software used is CX- Supervisor
For MITSUBISHI PLC - Uniware
PLC is used to control the particular operation in a plant —but —DCS is used to control the entire Plant
DCS is used when PLC’s are not sufficient to control the entire automation process ( more number of inputs and outputs)
PLC Power supply
Two types of PLC
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