Hollysys signed a contract with Lysys for the integrated management platform project of smart tunnel of Linzhou-Changzhi Expressway in Henan

Analog signal: refers to a continuous current signal or voltage signal, and analog signal can be divided into standard signal and non-standard signal. Switching signal: It can be divided into active signal and passive signal, which is basically an on-off signal, and can be measured on and off with a multimeter ohm. ...

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 ...

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. ...

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.

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.

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 ...

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.

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) Development in the direction of integration: the development of standardized data communication links and communication networks, and the formation of a large system of various single (multi) loop regulators, PLCs, industrial PCs, NCs and other industrial control equipment to meet the requirements of factory automation and adapt to the general trend of openness. (2) To the intelligent ...

CNC machine tool PLC (programmable logic controller) has the following common faults in the operation process, and the following corresponding solutions are taken for the faults in the work engineering to make the equipment operate normally. 1. The power grid fluctuates too much, and the PLC does not work It is manifested as no output of the PLC. Check first ...

Recently, Hangzhou Hollysys Automation Co., Ltd. (hereinafter referred to as Hollysys Company) successfully signed a contract with PetroChina Liaoyang Petrochemical Branch (hereinafter referred to as PetroChina Liaoyang Petrochemical) to construct and rectify 16 sets of control system projects during the planned overhaul in 2023 - 9 ...

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...

1. Check the circuit according to the drawing (without power transmission) The drawings of the general PLC system include two parts: the drawings in the cabinet and the drawings outside the cabinet; The drawing in the cabinet refers to the wiring diagram inside the cabinet; The out-of-cabinet drawings are the wiring diagrams of all electrical cabinets that are connected out. This part needs to be checked for; 1. Drawings ...

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 ...

To put it simply, DCS is mainly used for process automation, PLC is mainly used for factory automation (production lines), and SCADA is mainly for wide-area needs, such as oil fields and pipelines that stretch for thousands of miles. If from the point of view of computers and networks, they are unified, and the reason for the difference is mainly in ...

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. ...

PLC understands the interrupt function in this way, when understanding the interrupt, we must first understand the PLC operation cycle or the scanning cycle, it is necessary to say that the PLC sequential control cycle execution process, which is the premise of understanding the interrupt, must be mastered, divided into three parts, input processing, program processing, output ...

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.

1. Use the analog output module of the PLC to control the analog output module of the inverter The analog output module of the PLC outputs a 0-5V voltage signal or a 4-20mA current signal, which is used as the analog input signal of the inverter to control the output frequency of the inverter. This control method is simple to wiring, but it needs to be selected and changed.

1. PLC programmable logic controller (programmable controller). 2. DCS system pays more attention to the field of process control. Such as chemical, smelting, pharmaceutical, etc. It mainly monitors and controls some field parameters, while PLC focuses on logic control. machining). Of course, the PLC's ...