1. Switch logic control
Switching logic control is the basis of PLC. It is the first use case and the most extensive of all. Replace the previous relay circuit control and realize logic sequence control; It can be used for the control of stand-alone equipment, as well as for group control and automated factory assembly line.
Switching logic control for applications such as modular machine tools, grinding machines, packaging lines, etc.
2. Analog control
In the industrial production process, there are many changing quantities, such as temperature, pressure, flow, liquid level, speed, etc. In order to handle these analog quantities, PLCs need to realize A/D and D/A conversion between analog and digital quantities. Nowadays, PLC manufacturers usually produce matching A/D and D/A conversion modules to make the PLC easy to analogue control.
3. Motion control
The motion control module dedicated to the PLC body can drive stepper motors or servo motors for linear or circular motion. Almost all the products of major PLC manufacturers at home and abroad have motion control functions.
Motion control, applications such as: machinery, machine tools, elevators, etc.
Fourth, process control
As an industrial-grade control computer, PLC can write a variety of control algorithm programs to complete closed-loop control of analog quantities such as temperature, pressure, and flow. PID adjustment is a commonly used adjustment method in closed-loop control systems. Large and medium-sized PLCs generally have PID modules. Nowadays, many small PLCs are also equipped with modules with this function.
Applications such as: metallurgy, chemical industry, heat treatment, boiler control, etc.
5. Data Processing
The current PLC can complete the collection, analysis and processing of data such as mathematical operations, data transmission, data conversion, sorting, table lookup, and bit operation. This data can be compared with reference values stored in memory to accomplish certain control operations. Data processing is often used in large-scale control systems. Applications such as: flexible papermaking, textile, food industry and other large-scale control systems.
6. Communications and Networks
With the development of industrial plant automation network, PLC manufacturers attach great importance to the communication function of PLC and have launched their own characteristic network systems. Now the PLC is equipped with a communication interface, which makes the communication between PLC and PLC, and the communication between PLC and third-party equipment more convenient. The above points are qualitatively emphasized. PLCs can be large or small in number, so their control range can be large or small. so small that it can only control a certain device, or even a certain part, a certain site; Large enough to control multiple pieces of equipment, production lines, or even entire plants.
In fact, PLC has been widely used in various fields of industrial production, such as steel, chemical industry, electric power, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection, culture and entertainment and other industries, whether it is manufacturing or management inspection. You can see the shadow of PLC, which is determined by the continuous improvement of PLC's own characteristics.
|
More on that
|
Hollysys debuted at the XCon2022 Security Focus Information Security Technology Summit
On September 19, 2022, the XCon2022 Security Focus Information Security Technology Summit was successfully held in Beijing. More than 10 technical experts, heads of security departments, and front-line security experts from well-known domestic network security enterprises shared in-depth topics at the meeting.
|
|
Hollysys PLC - maintenance steps of PLC control cabinet
1. Data backup
When carrying out maintenance, we must cut off the power, data backup between power outages is an important link, for the data that needs to be archived for a long time, you can back up the historical trend data to the mobile hard disk, and then turn off the Windows-based operating system (Note...
|
|
Hollysys PLC - PLC maintenance and use skills
With the development of society, PLC programmable controller has been widely used in industrial production, but its maintenance and overhaul methods and skills, many engineers are not lawful, the following is to introduce the experience and skills of PLC use process.
1. PLC input and output
A ...
|
|
Hollysys DCS - DCS daily maintenance and fault analysis and troubleshooting methods
01. Power supply
The DCS power supply system is mostly a "dual backup hot redundant power supply", and the prevention and control of power failures is mainly reflected in the inspection and daily maintenance.
Generally speaking, as long as the unit is normal ...
|
|
Hollysys HOLLiAS MACS IC helps the localization of large-scale thermal power units
At 15:05 on January 12, 2022, Datang Anhui Luoneng Power Generation Co., Ltd. (hereinafter referred to as Datang Luohe) successfully completed the full-load trial operation of Unit 5 after comprehensive upgrading, marking the smooth operation of Unit 5 of Datang Luohe Power Plant after the transformation. Hollysys HOLLiAS MACS IC completely ...
|
|
Hollysys released a new DCS control system
Hollysys' safe and trustworthy DCS control system uses the controller K-CU11 for the K series large-capacity trusted controller module, which adopts advanced PowerPC architecture high-performance main processor and security components based on national cryptography algorithm, and has the security functions of static trusted start and dynamic trusted measurement. ...
|
|
Hollysys DCS - Introduction to I/O in DCS control system
The control system needs to establish the input and output channels of the signals, which is called I/O. The I/O in a DCS is generally modular, with one or more I/O channels on one I/O module for connecting sensors and actuators (control valves).
The control unit of the DCS: a process control station is ...
|
|
Hollysys PLC – PLC programming advice
(1) When the PLC and the host computer (or touch screen) form a monitoring system, there are many times when there are "manual", "automatic" and other control modes on the screen (generally when there is only one multiple). You can use the "MOV" command in the program. For example, when "manual" is selected, the constant 1 MO ...
|
|
Hollysys PLC - several common types of PLC control systems
1. Stand-alone control system
The stand-alone control system is controlled by one PLC to control one device or one simple production line, as shown in Figure 7-1. The composition of the stand-alone control system is simple, the number of I/O points required is less, the storage capacity is small, and when the model of PLC is selected, whether there is a communication network at present.
|
|
Hollysys PLC - PLC is classified by function
According to the different functions of PLC, PLC can be divided into three categories: low-grade, mid-range and high-end.
(1) Low-grade PLC
Low-grade PLC has basic functions such as logic operation, timing, counting, shifting, self-diagnosis, monitoring, etc., and can also have a small amount of analog input/output, arithmetic operation, math...
|
|
Hollysys - Contribute to China's green development "Yizhuang Power"
Facing China's "double carbon" strategic goals, the Beijing Economic and Technological Development Zone is guiding a large number of enterprises to explore the implementation plan of "carbon peak" and "carbon neutrality", and strive to build a number of green factories, green products and green supply chains. Recently, enterprises in the zone and Lisi Group signed a contract for the first time in China to use CO (dioxide...
|
|
Hollysys DCS - What are the characteristics of DCS?
1. High reliability
Because DCS disperses the system control function on each computer, and the system structure adopts a fault-tolerant design, the failure of one computer will not lead to the loss of other functions of the system. In addition, due to the fact that the tasks undertaken by the various computers in the system are comparatively ...
|
|
Hollysys PLC - the six application functions of PLC
1. It is used for switching control
The ability of PLC to manipulate switching quantities is very strong. The number of points in and out of the control, less than a dozen points, dozens of points, more can be hundreds, thousands, or even tens of thousands of points, because it can be networked, the number of points is almost unlimited, no matter how many points can be controlled, the control ...
|
|
Hollysys was invited to participate in the 2023 China Petroleum and Chemical Industry Digital Transformation and Intelligent Development Conference and delivered a keynote speech
On March 15, the 2023 China Petroleum and Chemical Industry Digital Transformation and Intelligent Development Conference was held in Tai'an, Shandong. The conference aims to strengthen the construction of "intelligent oil and gas fields, intelligent petrochemicals, intelligent chemicals and intelligent oil and gas pipeline networks", and lead China's petroleum and chemical industry to achieve intelligent transformation.
|
|
The main characteristics of Hollysys LE series PLC
LE series is a new generation of high-performance small and medium-sized PLC products launched by Hollysys, which is suitable for small and medium-sized industrial equipment control and distributed long-distance monitoring applications. LE-PLC combines the compact structure of small PLC products with the abundant functional advantages of medium-sized PLC products, and can support up to 20 local IOs or long ...
|
|
What should be paid attention to when cooperating with Lysys PLC-PLC and inverter?
1. Input of switch command signal
The input signal of the inverter includes a switch-type command signal that controls the operating status such as operation/stop, forward/reverse, section speed, and joging. Frequency converters usually make use of relay contacts or components with relay contact switching characteristics (such as crystals).
|
|
Hollysys PLC – How to calculate the analog quantity in PLC
1、-10—10V。 When the voltage of -10V-10V is converted to F448-0BB8Hex (-3000-3000) at 6000 resolution; At 12000 resolution, it is converted to E890—1770Hex (-6000—6000).
2、0—10V。 At a voltage of 0-10V, at a resolution of 12000 ...
|
|
Hollysys PLC - PLC should be noted in operation (2)
2. Interference in the control system and its sources
On-site electromagnetic interference is one of the most common factors in PLC control system and most likely to affect the reliability of the system. It is therefore essential to know the source of on-site disturbances ...
|
|
Hollysys DCS - Introduction to the hardware architecture of DCS distributed control system
DCS usually adopts a hierarchical and progressive structure, each level is composed of several subsystems, and each subsystem achieves a number of specific finite goals, forming a pyramid structure. Examining the hierarchical structure of DCS, DCS level and control management level are the two most basic links that make up DCS.
Process control...
|
|
What are the aspects of the configuration package of Hollysys DCS - DCS distributed control system?
1. Configuration of the control loop
The configuration of the control loop is essentially to use the various basic functional modules provided by the system to form a variety of actual control systems. At present, the configuration methods provided by various DCSs are different, and they can be summarized as having a specific computing module connected ...
|
|
Contact
working hours
