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What is PLC?

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info@Barzinelectronic.ir

+989156506148

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What is PLC?
70
15 January 2023
برزین الکترونیک

What is PLC?


PLC, also known as Programmable Logic Controller, is an industrial digital computer used to control industrial processes, such as assembly lines, robotic equipment, and any activity that requires high reliability control. be designed it was made. Presentation in programming and easy troubleshooting is one of the features of PLC. In other words, PLC is a software controller that receives information in binary form in the input part and processes them based on the program stored in the memory, and the result of the operation is also sent from the output part to takes place Sends commands to receivers and actuators. In other words, PLC is a logic controller for which the logic can be defined with the program

and easily changed if needed.

PLC repairs in Barzin Electronice

Repairing all kinds of industrial automation PLC in Barzin Electronics engineering team in Iran, Mashhad, with more than 11 years of experience in repairing industrial automation precision instruments in Iran, is proud to be among the leaders of the industrial automation repair industry, PLC, industrial computer, industrial display, etc. Repair for business owners.

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PLC operation method and application


PLCs are designed to last in harsh industrial environments and conditions and are protected against heat, dust and cold. A PLC has a microprocessor that is programmed using a computer language. The program is written in a computer and transferred to the PLC through a cable.

For the first time, PLC is used in the automotive industry and this device replaces relays and timers. In the PLC system, the output results in response to the input conditions must be produced in a limited time. If there is no proper response in the defined time, unwanted operation will happen in the system.

A range of PLCs are manufactured, starting from small PLC with about a dozen I/Os that are compact with a processor, to modular rack-mountable PLC that have thousands of I/Os and a set of have to network They are connected to other PLCs and to SCADA.

PLCs have many characteristics, but the most commonly used ones are:

Number of digital and analog inputs and outputs
Number of timers
Number of counters
Number of auxiliary relays
Programmable memory size
Speed of command execution
PLCs have industrial communication ports that can be used to communicate with other devices. This speeds up the exchange of information and allows more precise control to the PLC. The use of PLC in industries and factories is increasing and industrial electricians should know how to use it. In fact, every system needs control. There are 2 types of control in industrial systems.

hardware (electrical control circuits)
PL systems (which themselves are divided into 2):
DCS control systems
IPC personal computers
PLC components
Each PLC consists of two parts:

hardware
software
PLC hardware
The hardware of PLC includes CPU MEMORY, INPUT/OUTPUT, power supply and programming module.

PLC hardware includes the following:

Power supply unit
central processing unit
Memory: RAM (includes maintenance of flags, timers, numbers and user programs) and permanent memory (EEPROM, EOROM)
Input terminals: digital inputs and analog inputs
Output terminals: digital outputs and analog outputs
Processor communication module
Interface module: inputs and outputs image
Power supply module
The following figure shows the general structure of a PLC:

CPU
In order to prevent errors, the CPU continuously checks the PLC controller and performs functions including logic functions, computer interface and many other functions.

MEMORY
It is fixed data that is used by the CPU. The ROM system stores data permanently for system operation. RAM stores information about inputs and outputs, values of timers, counters and other internal equipment.

I/O section
Receives and sends inputs and outputs of field equipment, such as sensors and switches.

Power supply
PLCs have an isolated power supply. But most PLCs work with 220V AC or 24V DC power supply.

Programming Device
This device is used to send the program to the processor memory. The program is first entered into this device and then transferred to the PLC memory.

System Buses
Buses are ways to pass digital signals inside the PLC. There are 4 bus systems in PLC as follows:

Data bus, which is used by CPU to transfer data in different elements.
The control bus carries signals related to internal control functions.
The address bus sends the address of the positions to access the data.
The system bus helps the I/O ports and the I/O unit communicate with each other.

Memory used in PLC

Semiconductor memories and more RAM and EEPROM are used in PLC. A battery is also used to prevent erasing of RAM memory information when the power is cut and the device is turned off. A capacitor is also connected in parallel with the backup battery, which can supply the system with electricity for 30 seconds when the battery is replaced.

Compared to the traditional solution methods and PLC, it can be concluded that the PLC method is easier and more capable than the traditional method. In PLC, you can easily make changes in the program and its implementation. It also has a smaller and cheaper volume and is easier to maintain.

The importance of PLC in industrial automation


Better control of production processes
High speed and accuracy
Ability to read all types of digital, analog and high frequency inputs
The ability to transfer commands to systems and output components such as industrial monitors, motors, valves, etc
Network connection facilities
Very small dimensions
Very high response speed
Safety, accuracy and high flexibility
Networking of PLCs and the possibility of managing them with a central computer

Application of PLC
Control of any machine and electrical device
Control of each production line system
CNC circuit steering control
Advantages of PLC
Wiring new systems compared to relay control systems
Since the PLC consumes very little power, the power consumption will be greatly reduced.
PLC system’s built-in troubleshooting functions make system diagnosis and troubleshooting very fast and convenient.
Unlike the old systems, in the new control systems, if we need to change the way of control or the order of its steps, we can do it without changing the wiring and just by writing a few lines of the program. As a result, very little time and money will be spent on doing this.


The difference between PLC and computer


All the components of a computer are present in a PLC, but the computer is different from the PLC in terms of the type of inputs and outputs as well as the combination of inputs and outputs. PLC output can be a relay-transistor-thyristor etc. which must be selected according to the maximum permissible output current of the P_L C so as not to damage the system. In P L C, we see the result of the operation, but in the computer, we only see the information.

plc types


In the PLC industry, there are more than a hundred factories with great diversity in designing and manufacturing different types of PLC. PLCs can be classified according to memory size or number of inputs/outputs

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