Hollysys PLC - Introduction to the composition of PLC control cabinet

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、-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 ...

When the PLC understands the interrupt function, it needs to understand the PLC's operating cycle or scan cycle. It is necessary to talk about the process of PLC sequential control loop execution, which is a prerequisite for understanding interruptions and must be mastered. It is divided into three parts, input processing, program processing, and output processing. 1、 ...

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.

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. ...

(1) There are three forms of programmable controller: relay output, thyristor output, and transistor output. (2) The wiring of the output terminal is divided into independent output and common output. When the output relay or thyristor of the PLC is activated, the two output terminals of the same number are turned on. In different groups, you can ...

1. Relay output circuit This type of output circuit form can be either DC or AC. The output circuit form of PLC relay allows the load to be generally below AC250V/50V, the load current can reach 2A, and the capacity can reach 80-100VA (voltage × current), so ...

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...

1. View the data on the monitoring screen When the following situations occur, it means that there is a problem with the control system, and the microcomputer maintenance personnel should be notified immediately for maintenance, and the operator should go to the site to deal with it. (1) Frequently changing data does not change for a long time, and several or all data do not ...

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, ...

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 ...

First, the type of failure of the PLC. 1. External equipment failure. External equipment refers to various switches, sensors, actuators, loads, etc., which are directly connected with the PLC operation process. The failure of these equipment will directly affect the control function of the PLC system. Therefore...

The control of pulse amount is mostly used for angle control, distance control, position control and so on of stepper motor and servo motor. The following is an example of a stepper motor to illustrate each control mode. 1. Angle control of stepper motor. First of all, it is necessary to clarify the number of subdivisions of the stepper motor, and then determine the stepper ...

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. ...

Recently, the signing ceremony of the strategic cooperation between Bureau Veritas and Hollysys and the functional safety certification ceremony of Hollysys valves were held in the Hangzhou base of Hollysys. Mr. Ye Jiong, General Manager of Bureau Veritas Technology Center, Mr. Zhong Aimin, Director of Product Certification Center, Mr. Yang Yang, Sales Director of Eastern Region, and Mr. Yang Yang, Director of Functional Safety ...

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 ...

(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 ...

On August 16, 2021, the Tarim Oilfield Natural Gas Ethane Recovery Project, the largest natural gas deep processing base in Xinjiang (1), a key project of PetroChina, was successfully completed and put into operation, with stable operation and the production of qualified ethane products. Tarim Oilfield Natural Gas Ethane Recovery Project ...

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...

Hollysys, as the PC general contractor, participated in the construction of the first smart water project in the domestic nuclear power industry (1) - Qin's No. 2 Plant Chengjing Water Intake Smart Operation and Transformation Project, which was recently completed and put into operation. The project is independently implemented by Hollysys, and Hollysys is independently controllable, safe and reliable, and deeply developed by the nuclear high-tech project.