Hollysys signed a strategic cooperation agreement with Jinan Iron and Steel International in Jinan

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...

Kunming Changshui International Airport is one of the eight regional hub airports in China and one of the five national large-scale gateway hub airports. With the rapid economic development of Yunnan Province, the aviation business volume of Kunming Airport has grown rapidly.

1. DCS is a "distributed control system", while PLC (programmable controller) is just a control "device", which is the difference between the two. The system can realize the function and coordination of any equipment, and the PLC equipment only realizes the function of this unit. 2. In terms of networking, the DCS network is ...

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...

Simplicity Make the PLC program as simple as possible. Simplicity means using a standardized procedural framework as much as possible and using simple instructions as much as possible. If you want the program to be simple, in a big way, you should optimize the program structure, simplify the program with process control instructions, and ...

Whether it is a new unit or an upgraded DCS, the equipment of the system and controller should focus on the reliability and load factor (including redundancy) objectives. The load rate planning of the communication bus must be controlled within a reasonable range, and the load rate of the controller should be balanced as much as possible.

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, and can also be used for group control and ...

3. Main anti-interference measures (1) Reasonable treatment of power supply to suppress the interference introduced by the power grid For grid disturbances introduced by the power supply, an isolation transformer with a shielded ratio of 1:1 can be installed to reduce the interference between the equipment and the ground.

1. Power supply: The power supply is used to convert the alternating current into the direct current required inside the PLC, and most of the PLCs are powered by switching regulated power supply. 2. Central processing unit: The central processing unit (CPU) is the control center of the PLC, and it is also the core component of the PLC.

1. Power off 2. Cleaning the ash can not only clean the surface, but also clean the internal card key of the controller 3. If there is a supporting UPS, open the UPS and clean the ashes 4. After cleaning the ash, check whether the card and relay are loose, and tighten them if they are loose 5. The relays with frequent actions should be cleaned regularly.

Since the reform and opening up, China's economy has developed rapidly, and many enterprises have improved production efficiency by introducing foreign production equipment and DCS systems. However, with the growth of the use years, many foreign DCS systems and equipment have gradually aged and are not suitable for the current production needs, so they are localized.

1. The thermocouple uses a compensation wire, and there can be a node in the middle, but the corresponding compensation cable must be used to directly connect to the DCS thermocouple module, such as the LLMUX card in HONEYWELLTPS. Minimize nodes to reduce interference. In addition, in the DCS configuration, it is necessary to select the corresponding thermocouple model, and supplement the ...

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 ...

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.

DCS is the English abbreviation of distributed control system (Distributed Control System), distributed control system is referred to as DCS, which can also be literally translated as "distributed control system" or "distributed computer control system". The decentralized control system is based on the microprocessor, and the control function is decentralized.

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 ...

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 ...

1. Open empty A master air switch that is the power control for the entire cabinet. 2. Power supply A 24VDC switching power supply. 3、PLC This should be chosen according to the needs of the project. If the scale of the project is small, the integrated PLC can be used directly; If the item ...

According to the structural form of PLC, PLC can be divided into two categories: integral type and modular type. (1) Integral PLC The integral PLC is a centralized power, CPU, I/O interface and other components in a chassis, which has the characteristics of compact structure, small size and low price. Small PLC ...

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 ...