And Lysisys DCS - the difference between DCS control and PLC control

In order to further strengthen the comprehensive cooperation with Shaanxi Traffic Control Group, on August 11, 2022, Xu Yue, Chairman and Co-President of Hollysys Group, visited Zhang Wenqi, Secretary of the Party Committee and Chairman of Shaanxi Traffic Control Group, and the two sides conducted in-depth exchanges and cooperation on topics such as business ecology and smart highways.

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.

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 ...

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...

In December 2020, the equipment of Sinopec Qingdao Petrochemical Co., Ltd. (hereinafter referred to as Qingdao Petrochemical) 5 million tons/year oil refining integration project, which was upgraded and transformed by Hollysys, was successfully operated, marking the successful completion of the DCS equipment upgrading task. This upgrade is a major development for Sinopec Industrial Holdings.

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...

1. Confirm that the new computer has relevant interfaces and can be used normally, and Hollysys DCS software can run on the computer operating system 2. Device and Lisi DCS software, dongle, and related drivers (mainly redundant network cards, data hard disks, etc.) 3. Set up ...

(1) The ambient temperature exceeds the range of 0-50 °C; (2) The relative humidity exceeds 85% or there is dew condensation (caused by sudden temperature changes or other factors); (3) direct sunlight; (4) There are corrosive and flammable gases, such as hydrogen chloride, ...

In order to improve the anti-interference ability of the PLC system, we should start from the design. In the anti-interference design of specific projects, products with strong anti-interference ability can be selected to improve the anti-interference of equipment and systems by suppressing interference sources, cutting off or attenuating the transmission path of electromagnetic interference, and using software means.

(1) High reliability DCS is designed to be fault-tolerant, so that when a computer fails, it does not cause the system to lose other functions. In addition, because the tasks undertaken by the individual computers in the system are relatively simple, it is possible to adopt a specific structure and ...

1. Logic control of switching quantity This is the most basic and most extensive application field of PLC, which replaces the traditional relay circuit to achieve logic control and sequence control, which can be used for the control of a single device, as well as for multi-machine group control and automatic assembly line. Such as injection molding machines, printing machines, ...

1. Lack of motivation It may sound simple, but it's good to check the simple stuff first. Thoroughly inspect all power connections and cables for damage that could cause a short circuit. Make sure your power supply is functioning properly. Use a voltmeter to check if the grounding and voltage are correct. 2. Bad ...

The bottom layer, the field control layer, that is, the field instrument and signal transmission, is mainly the collection of signals and the transmission of control signals. From field devices to control CPUs. The middle layer, the system management layer, that is, the internal network layer of the DCS system, including the control station, the operation station, the historical server...

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...

1. The function of PLC PLC is a general industrial automatic control device with microprocessor as the core, integrating computer technology, automatic control technology and communication technology, which has high reliability, small size, strong function, simple program design, flexible and universal and maintenance methods.

1. What is serial communication? Serial is a very versatile protocol for device communication on a computer (not to be confused with Universal Serial Bus or USB). Most computers contain two serial ports based on RS232. The serial port is also an instrument ...

The choice between a programmable logic controller (PLC) and a distributed control system (DCS) is a case-by-case analysis, as the requirements for the control system vary depending on the application. You can start from the following aspects! PLC and DCS PLC ...

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...

Various brands of PLCs have a self-diagnosis function, but the trick of PLC repair is to make full use of this function to analyze and then pinpoint the problem. Sorted out the 8 common types of errors that PLC repairmen need to know when the PLC presents abnormal alarms. 1. CPU abnormality ...

Resistive coupling interference In the process of work, many factories ignore the problem of wire aging. When a variety of signal lines are transmitted together, other transmission signals will be affected due to the aging and leakage of the insulation material on the wire, and other transmission signals will be interfered with. ...