Hollysys won the 2022 China Intelligent Transportation Association Science and Technology Award"

The steps of DCS system troubleshooting include: (1) Check the fault caused by improper use. Common types of operational faults include operator errors, terminal wiring faults, module installation faults, and power supply failures. (2) Troubleshoot the improper operation of the DCS system ...

(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 ...

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 ...

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 ...

Merit: 1. High reliability: The DCS system has multiple redundancy, backup and recovery mechanisms, which can ensure the high reliability and stability of the system. 2. Sensitivity: The DCS system can be customized according to different industrial processes to meet different control requirements. 3. Efficiency: D...

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...

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 ...

Recently, Hollysys successfully signed a contract with Luxi Chemical Group Co., Ltd. (hereinafter referred to as Luxi Chemical) for a 1.2 million tons/year bisphenol A equipment project. The project is a key project in Shandong Province in 2021, which will not only greatly improve the competitiveness of Luxi Chemical polycarbonate in the industry, but also have a significant impact on China's phenol ...

1. The switching quantity is also called the logical quantity, which means that there are only two values, 0 or 1, ON or OFF. It is the most commonly used control, and controlling it is the advantage of PLC, and it is also the most basic application of PLC. The purpose of switching control is to follow the current input combination with the historical input according to the switching quantity.

The "2023 China Automation + Digital Industry Annual Conference", "The 19th CAIMRS and Digital Leaders Forum" and the "Annual Award Ceremony" were successfully held in Suzhou. The theme of this summit is "Powerful Digital Intelligence, Junfa New Industry", combined with post-epidemic recovery, digital intelligence, and new industrialization.

01 Node bus failure The node bus material is usually a coaxial cable, so as long as there is a cable disconnected, the communication of all devices on the bus will be paralyzed, which will cause serious phenomena such as data loss, equipment stoppage and operation interruption, and may eventually directly or indirectly cause huge ...

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 ...

First, the working environment (1) Temperature The PLC requires that the ambient temperature is 0-55oC, and it cannot be placed under the components with large heat generation during installation, and the surrounding ventilation and heat dissipation space should be large enough. (2) Humidity In order to ensure the insulation performance of PLC, the relative humidity of the air ...

1. The configuration of the system and controller should focus on reliability and load rate (including redundancy). The communication load rate must be controlled within a reasonable range, and the load rate of the controller must be balanced as much as possible to avoid the occurrence of "high load" problems. 2. The distribution of system control logic should not be too much.

1. What is a communication protocol? A communication protocol is an agreement between two parties to a communication. The agreement includes uniform provisions on data format, synchronization mode, transmission speed, transmission steps, error detection and correction mode, and control character definition, etc., which must be complied with by both parties to the communication. Therefore...

DCS spare parts In the process of using the DCS control system, its management is more important. The requirements of general DCS spare parts management are summarized in four aspects: storage, inspection, preparation for use, and use. 1. Storage DCS system, spare module storage should meet the requirements ...

1. PLCZ self-fault judgment In general, PLCs are extremely reliable devices with a very low failure rate. The probability of hardware damage such as the CPU of the PLC or software running errors is almost zero; If the PLC input point is not caused by strong current intrusion, it will hardly be damaged; PLC output relay ...

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. ...

1. The output accuracy is as high as 0.05%, which greatly improves the operation efficiency of the system. 2. The full-scale output of the channel signal is 0-22.7mA, and the output range is wide; 3. It can be adapted to the enhanced base to achieve channel resistance to 220VAC; 4. It has a perfect channel signal diagnosis function, which can be realized.

Recently, Hollysys signed a contract for the comprehensive management platform project of smart tunnel of Linzhou-Changzhi Expressway in Henan Province. Linzhou to Changzhi Expressway is a traffic artery that crosses the Grand Canyon of Taihang Mountain, through Henan and Shanxi, with a total of 7 pairs (14) tunnels.