Before PLCs were created many Automobile industries used Complex relays to control their processes. These processes are huge time-consuming, less robust, sometimes electricians would individually rewire every relay to change a production system. The development of the low-cost computer(PLC) has brought a revolution in automation. PLC Training in Chennai at FITA Academy provides the complete overview of programmable logic controller concepts.
PLC devices are widely used in manufacturing and automation. Its purpose is to monitor important process parameters and adjust process functions accordingly. It is designed to survive harsh conditions and is protected from heat, cold, dust, and moisture. They are programmable logic controllers or simply PLC.
The components of PLC are classified into three parts.
1.The input-output modules
2.CPU, Power supply
3.Rack.The input-output or (IO) modules
Information is transmitted inside and outside the PLC through IO modules. The input module has terminals that contain electrical signals generated from sensors or transformers on the plant side.
The output module has terminals, which send output signals to activate solenoids, motors, heaters, displays, and so on. Typically a module has 4, 8, 12, or 16 terminals. Sometimes, the processes controlled by the PLC are too far away from the CPU. An electronic system such as remote amplifier units is used to avoid data loss.Central Processing Unit
The central processing unit is the PLC’s brain. It performs arithmetic and logical processes. An operating system is stored permanently in the ROM area of the CPU and it is not lost when input power is off The application program is stored in Read-Write a portion of memory. A battery backup may also be present to prevent loss of data.Power supply and rack
PLC CPU works at a constant voltage and current. Thus, PLC contains a built-in voltage converting power supply. If you are interested to know how PLC works in the industry, Just step into the PLC Course in Chennai, they will arrange industrial visits. Therefore beginners will get a great opportunity to know the working principles of PLC devices.
PLCs classified into two types based on the industry requirements:
Fixed: A fixed PLC contains a fixed number of Inputs & Outputs.
Modular: In modular PLC, Input and Output can be expanded. All I/O Modules are stored together in a rack. Modular PLCs have a chassis (also called a rack) in which the blocks are placed with different functions.
A PLC operation consists of 3 steps
Input scan: It checks the status on the input side.
Program scan: The CPU begins to execute the application program written in the PLC programming language.
Output scan: It writes data to the output module so that all releases are updated. Scan time is how long it takes for the PLC to Rotate the whole process back to the beginning. PLC Training Institute in Chennai is the best platform to know about PLC programming, Troubleshooting, PLC data manipulations Etc.