As you know, the main prerequisite for doing any work is to have accurate information about that subject. In the discussion of choosing, checking prices, buying, and getting to know more about the types of PLCs, the following information is included so that you, dear visitors of the specialized website of Dematheheez (an official member of the Heating and Air Conditioning Dealers Association), can use these tips. With enough information, choose and buy suitable PLCs in bulk for your living or work environment.
In simple words, PLC is a device that can program an operation that can provide the desired data as input to the device to process it and finally control or display the outputs. The use of PLC has caused many of the conventional wirings in relay control circuits to be eliminated. It can be said that PLC is a programmable computer that is very easy to work with. By knowing the simple principles and basic logic, you can analyze and understand the basis of its work. These devices are like the electrical command circuit of a controller, but unlike them, they are logical. Join us in introducing and checking the performance of PLC types in the rest of this article.
PLC or programmable logic controller (PLC: Programmable Logic Controller) is an industrial digital computer with different applications used in industrial processes that require simple troubleshooting and reliable and accurate control. Among the industrial processes in which PLC is used, we can mention production processes, assembly line control, and robotic devices.
Each PLC consists of five main parts:
All these five parts are placed in one unit in small PLCs, and in larger PLCs, each is placed in a separate unit.
In the specialized HVAC group of Damatajhiz, all the PLCs are only sold in bulk. Therefore, if you want to wholesale any of these products, feel free to contact us.
Each PLC manufacturing company produces four different models of PLCs with unique and specific names for their manufacturing company. These four general models of PLC devices are:
Integrated PLC: Small PLCs are usually designed and built as compact or integrated, meaning that the power supply and CPU and the input and output modules are integrated and considered a unit. This type of PLC can maintain only 1000 program lines, but they have space to connect additional input and output programs.
Modulator PLC: In this type of PLC, unlike the integrated type, the user can choose the input and output modules of the same family according to their needs and put them together, including separate power supply cards. CPU, input, and output are required in number, respectively, installed on the RACK and inside the SLOTS slots.
PLCs are used in various industries, some of which are designed and manufactured for special applications such as hazardous environments, which are often explosion-proof. The price of explosion-proof and EX PLCs is higher than other PLCs with similar features. Some of the applications of PLCs in various industries are:
Heavy industries: industrial coolers, automatic control systems, devices, and equipment used for melting metals.
Plastics industries: melting and injection molding machines, air blowing systems for plastic production and analysis
Machine industries: danger notification and warning systems, wood industries, packaging industries, systems used in metal welding, drilling systems, etc.
Construction services: automatic lighting systems, elevators, air control, air conditioning, etc.
Chemical industry: mixing systems, devices combining materials with different proportions, etc.
Automotive industry: paint spraying systems and body shaping by automatic presses, connecting parts, testing car parts and equipment, automatic drilling operations, etc.
Food industry: centrifuge systems, extraction and packaging systems, etc.
Among the most famous PLC brands, we can mention Delta PLCs, made in Taiwan, Siemens PLCs from Germany, Omron from Japan, and Allen Bradley from America, each of these PLCs is designed with its programming and has been built.
PLC programming is done in various ways, and three methods are used to display the PLC program; we will introduce these languages in the following:
Ladder Programming (LAD): The program structure of this method is similar to relay circuits, and the program is shown as connection symbols and relay control circuit screw systems.
Programming by flow chart method (CSF) or function facet display (FBD): rectangular symbols are used in this method, and regional action is displayed in each rectangle.
Programming using the written method or list of sentences (STL): In this programming language, commands and key sentences are used to write the program, and each statement has two parts, an operator and an operand.
Input Scan: Detects the status of all input devices connected to the PLC.
Program Scan: The program logic created by the user is executed.
Output scan: All input devices connected to the PLC are energized or de-energized.
Internal operation: This phase includes communication with programmable terminals, internal diagnostics, etc.
In the PLC group, the reference site and store of Damatajhiz, you can view the information and prices of Siemens brand PLCs for review and selection.
In addition to a valid business license from the heating and air-conditioning trade union, Damatajhiz has an electronic trust symbol and has been operating its store site since 2013 in Tehran's head office.
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