1. Budget for input and output (I/O) points When budgeting I/O points, the appropriate margin should be considered, usually based on the calculated number of input and output points, and then add 10%-20% of the expandable, and after the margin, it will be used as the budget data of input and output points. When ordering in practice, it is also necessary to rely on the manufacturer's ...

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...

How a PLC controller works 1. Scanning technology When the PLC is put into operation, its working process is generally divided into three stages, namely input sampling, user program execution and output refresh. The completion of these three phases is called a scan cycle. During the entire operation ...

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. Communication network failure: communication network faults are generally easy to occur at the contact bus and local bus, or caused by wrong address identification. 2. Node bus failure: The transmission medium of the node bus is generally coaxial cable, some use token signal transmission mode, and some use ...

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 ...

In recent years, the State Administration of Safety Supervision, the Ministry of Industry and Information Technology, the Ministry of Education, and the Ministry of Finance have successively launched a number of national policies to implement major decision-making projects such as vocational skills improvement actions, safety skills improvement actions, and vocational education reforms, aiming to create a highland for the training of technical and skilled talents.

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.

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...

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.

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 ...

Since the day of the birth of PLC, it has occupied the core position of the entire automatic control system. There are also many discussions about the development direction of PLC, whether it is predicted that PAC will replace PLC from 10 years ago, or during this time, some people even say that PLC is no longer needed in the future Industry 4.0 era...

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 ...

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 ...

With the inclusion of "exploring the construction of digital twin cities" in the 14th Five-Year Plan, the field of intelligent transportation is being endowed with more new business value. Recently, Century Qualcomm and Hollysys reached a strategic cooperation, based on the principle of "giving full play to advantages, mutual promotion, long-term cooperation, mutual benefit and win-win", ...

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.

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 ...

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...

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 ...

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. Preliminary preparations Engineering configuration is operated at the engineer station, and before engineering configuration, it is necessary to have the necessary tools and information, specifically: Tools: refers to the hardware environment and software environment used in engineering configuration, usually refers to the ...