Please advise, which manufacturers of PLCs used in construction machinery are the main ones, and wha

plc。The advantages are: high reliability and stability.

Defects: The architecture of PLC is closed, the hardware system of each PLC manufacturer is incompatible with each other, the programming language and instruction system are also different, when the user chooses a PLC product, must choose the corresponding control procedures, and learn a specific programming language.

PC. It can realize the control function of the original PLC. And it has the advantages of stronger data processing capabilities, powerful network communication functions, and the ability to execute relatively complex control algorithms and its nearly unlimited storage capacity.

Defects: PC-based automatic control also has its shortcomings, and the reliability, real-time and stability of its equipment are poor.

In the early days, Panasonic and Omron were the majority.

At present, Siemens is the majority in the northern region, and Mitsubishi is the majority in the southern region, but it is not endless, depending on the use and design unit.

Nowadays, there are many domestic ones for small equipment, such as Inovance, Delta, etc.

The advantages and disadvantages are not necessarily, it mainly depends on what you are used to and what you want to do, which can basically be achieved, nothing more than the cost, memory, points, etc.

Siemens, Fanus, Schneider, ABB

Domestic: Delta, Yonghong, Tengkong, Inovance.

Konichi: Omron, Mitsubishi, Panasonic.

Each has its own advantages, but they are much the same.

It is recommended to support domestic ones! In particular, don't use the small day!

At present, except for Siemens, PLC is basically Japanese, like Panasonic, Mitsubishi, and Hitachi, which are all good. Domestic technology is currently not keeping up.

Omron, Mitsubishi, Siemens, AB are all useful.

Construction machinery generally has more EPEC in the Netherlands, suitable for harsh environments, and multi-PWM interface for mobile machinery. Codesys programming environment.

Advantages: high reliability, strong anti-interference ability, complete support, perfect functions, strong applicability, easy to learn and use, small design and construction workload of the system, convenient maintenance, easy to transform, small size, light weight, low energy consumption.

The PLC replaces the wiring logic with storage logic, which greatly reduces the wiring outside the control equipment, greatly shortens the cycle of control system design and construction, and makes maintenance easier. What's more, it makes it possible to change the production process with the same equipment through changing the program. This is ideal for high-mix, low-volume production.

Output unit. The output unit is also the connecting part between the PLC and the controlled equipment, and its function is to transmit the output signal of the PLC to the controlled equipment, that is, to convert the weak current signal sent by the processor into a level signal to drive the actuator of the controlled equipment. The types of outputs are relay output, transistor output, and crystal gate output.

In addition to the above-mentioned parts, the PLC also has a variety of external devices depending on the model, which are used to help with programming, monitoring, and network communication. Commonly used peripherals are programmers, printers, cassette recorders, computers, etc.

Compared with single-chip microcomputer, PLC has the following advantages: high reliability, strong anti-interference ability, easy programming, convenient use, and strong application to harsh industrial environments.

PLC control system, programmable logic controllerIt adopts a kind of programmable memory designed for industrial production, which is used for storing programs in its internal program, executing user-oriented instructions such as logic operation, sequence control, timing, counting and arithmetic operation, and controlling various types of machinery or production processes through digital or analog input and output. It is the core part of industrial control.

Since the introduction of programmable logic controller (PLC) in the United States in the sixties of the twentieth century to replace the traditional relay control device, PLC has developed rapidly and has been widely used around the world.

At the same time, the functions of PLC are constantly improving. With the continuous development of computer technology, signal processing technology, control technology and network technology and the continuous improvement of user needs, PLC has added analog processing and motion control functions on the basis of switching processing. Today's PLC is no longer limited to logic control, but also plays a very important role in motion control, process control and other fields.

PLCs have both stop and run states. When in the STOP state, the PLC does not scan the user's program and has no output. When the PLC is in the RUN state, the PLC scans the user program, and according to the logical state of the user program, the switch, analog input signal, digital input signal, communication signal, etc. are logically processed, and the processing results are output through the output port, analog output port, digital output port, PID, and communication, so as to achieve the purpose of controlling various execution components.

Hardware can be quickly set up using standard modules.

The software can be changed at any time via a ladder diagram.

The biggest advantage is that it is convenient and reliable, depending on the technology of the person who wrote the program.

Single-chip microcomputer, cost-effective.

PLC, too expensive. Operators can make money.

PLC is simpler, and the steps are too cumbersome if the sequential output is too cumbersome! MCU programs are difficult to write, but they are highly controllable.

A programmable logic controller is an electronic system of digital operations designed for use in industrial environments. It uses a programmable memory to store instructions for performing operations such as logic operations, sequence control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production processes through digital or analog inputs and outputs.

Uses of PLC technology:

1. Open-loop control.

Open-loop control of switching quantities is the most basic control function of PLC. The instruction system of PLC has powerful logic operation ability, and it is easy to realize various logic control methods such as timing, counting, and sequential (stepping). Most PLCs are used to replace traditional relay contactor control systems.

2. Analog closed-loop.

For the analog closed-loop control system, in addition to the input and output of the switching quantity, there should also be the input and output points of the analog quantity, so that the sampling input and adjustment output can realize the continuous adjustment and control of temperature, flow, pressure, displacement, speed and other parameters. At present, PLCs not only have this function for large and medium-sized machines, but also some small machines also have this function.

3. Digital control.

When the control system has a rotary encoder and a pulse servo device (such as a stepper motor), the PLC can be used to realize the function of receiving and outputting high-speed pulses, realize digital control, and the more advanced PLC has also specially developed a digital control module, which can realize the curve interpolation function, and recently launched a new type of motion unit module, and can also provide a programming language for digital control technology, so that PLC realizes digital control more simply.

4. Data collection and monitoring.

Because the PLC is mainly used for on-site control, it is a very necessary function to collect on-site data, and on this basis, the PLC is connected with the upper computer or touch screen, which can not only observe the current value of these data, but also carry out statistical analysis in time.

Some PLCs have a data logging unit, which can be inserted into the unit with a memory card of a general personal computer to save the collected data. Another feature of PLC is that the self-test signal is more Using this feature, the PLC control system can realize white diagnostic monitoring, reduce the failure of the system, and improve the reliability of the system.

PLC (Power Line Communicaon) is the full name of power carrier communication technology, also known as power line network, is an important part of the power system, at present, the domestic is based on optical fiber communication, microwave communication, power line carrier communication and other ways of coexistence of power system communication network pattern.

Its outstanding feature is that it does not need to be rewired, and can use the existing power lines to achieve data transmission, so it is also gradually used in the Internet of Things technology, used in smart street lights, smart homes, smart buildings and industrial control and other fields.

With the development of whole-house smart home, PLC technology is also widely used in smart home, taking Lingpu PLC dual-line whole-house smart home system as an example, it is connected to the domestic mainstream Mijia ecological platform to achieve a stable, reliable and flexible whole-house smart home scene experience. Compared with the traditional bus solution, it is free of wiring, simple operation and maintenance, cost reduction, compared with the wireless solution, it has good stability and anti-interference, it can be said that Lingpu PLC dual-line whole house smart home system has the advantages of both schemes, and has a new breakthrough, will be one of the trends of the future whole house smart home deployment.