Hollysys DCS——What should I pay attention to when cleaning the DCS system?

The bottom layer, the field control layer, that is, the field instrument and signal transmission, is mainly the collection of signals and the transmission of control signals. From field devices to control CPUs. The middle layer, the system management layer, that is, the internal network layer of the DCS system, including the control station, the operation station, the historical server...

1. Check before power-on If the cable insulation resistance meets the requirements (greater than 5M ohms), check the cable insulation resistance test record, and spot check the actual measurement if necessary. Check that all power cables, signal cables, and communication buses should be connected. Control stations, operator stations, engineer stations, etc.

1. What is serial communication? Serial is a very versatile protocol for device communication on a computer (not to be confused with Universal Serial Bus or USB). Most computers contain two serial ports based on RS232. The serial port is also an instrument ...

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 ...

On April 7, 2021, the "2021 China Software Industry Annual Conference" hosted by the China Software Industry Association was held in Beijing. With years of technology accumulation and outstanding strength, Hollysys Group won the title of "The Most Influential Enterprise in China's Software Industry in 2020", as well as the "...

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 ...

In general, DCS control systems require two types of grounding: protective ground and working ground (logical, shielded, etc.). For systems equipped with safety barrier explosion protection measures, such as those used in the chemical industry, intrinsically safe premises are also required. 2.1 Protected areas (CG, Cabinet Grounding...)

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...

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...

On November 13, 2022, Zhong'an United Coal Chemical Branch came with exciting news that the 20,000 tons/year butene-1 plant produced qualified butene-1 products at 22 o'clock on the same day, and the one-time start-up was successful. The control system of the device adopts the innovative technology product "OCS Industrial Optical Bus Control ...

On October 18, 2022, the China Intelligent Transportation Association released the list of winners of the "2022 China Intelligent Transportation Association Science and Technology Award", which includes the Science and Technology Progress Award, the Technology Invention Award, and the Outstanding Innovative Talent Award. Among them, Beijing Hollysys System Engineering Co., Ltd. ...

There are many new developments in the field of DCS-related, which are mainly manifested in the following aspects. (1) The system function is developing in the direction of openness. The structure of traditional DCS is closed, and it is difficult to be compatible with DCSs from different manufacturers. The open DCS will allow users to set a larger system ...

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.

On December 18, 2020, the "8th Member Congress and 2020 Zhejiang Enterprise Leaders Summit" hosted by Zhejiang Enterprise Confederation, Entrepreneur Association and Industrial Economics Federation (hereinafter referred to as the "Three Associations" of Zhejiang Province) was held in Hangzhou. At the conference, the top 100 in Zhejiang Province in 2020 were commended.

1. Realize remote control of industrial field equipment; 2. The PLC industrial gateway realizes remote upgrade of equipment firmware, downloads the program, and can flexibly access various equipment management platforms; 3. Realize remote control of industrial site touch screen and remote mapping of configuration screens; 4. PLC industry ...

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.

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 ...

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 ...

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 ambient temperature exceeds the range of 0-50 °C; (2) The relative humidity exceeds 85% or there is dew condensation (caused by sudden temperature changes or other factors); (3) direct sunlight; (4) There are corrosive and flammable gases, such as hydrogen chloride, ...