Automation Control System Based on Industrial Network

Automation Control System Based on Industrial Network
System Overview:
The automation control system based on industrial networks is widely used in industrial fields such as mining, petrochemicals, food, medicine, and biochemistry. It can monitor and control on-site operating equipment to achieve various functions such as data acquisition, equipment control, measurement, parameter adjustment, and various signal alarms. High precision, low-cost, and highly reliable data acquisition and control systems are required in some important industrial fields such as mining. In these fields, monitoring points are often widely distributed with long distances between them, which makes it difficult for data collection and distributed control. Therefore, networked control of automatic control systems applied in these fields is of practical significance. At present, automation control systems are developing towards distributed system architecture and intelligence.
The "Industrial Network based Automation Control System" developed by Hangzhou Shanghang Communication Equipment Co., Ltd. adopts Omron CP1H series PLC and DeviceNet network module (CJ1W-DRM21) as the main station, and connects the slave nodes composed of PLCs or acquisition cards with network interfaces through T-branch connectors to achieve networked communication control. It can be widely used in industrial fields such as mining, petrochemicals, food, medicine, biochemistry, etc., and can achieve high-speed real-time data acquisition and control.
Scheme composition:
In this scheme, the data collection, data processing, and system monitoring units are designed in layers, and the network topology principle is shown in Figure 1.

The top-level data monitoring layer is the data monitoring center, which consists of one or more industrial control computers, realizing real-time display, storage, printing and other functions of data, and sharing data through the network. The middle layer is the data processing layer, which is composed of multiple programmable logic controllers (PLCs) according to the system requirements. CLK (or PC-LINK) data communication is used according to the working conditions, and data transmission is achieved through a fiber optic system. The fiber optic system adopts a single link connection method, and the data monitoring center communicates with the PLCs in the data processing layer through RS485. The bottom layer is the device layer, consisting of PLCs or acquisition cards equipped with network interfaces, such as sensors and actuators such as motors on on-site devices.
The various functional units of the system can be configured with hardware and its functions as needed, such as I/O quantity, redundancy mode, communication interfaces, etc. Especially, the device layer terminals can be independently designed according to different application environments to meet the requirements of different occasions. This method can be used for building new networked automatic control systems, as well as facilitating technical transformation of existing control systems. In addition, due to the high reliability, strong anti-interference ability, and easy maintenance of PLC, using PLC as the data processing layer of the system for data processing and object control can make the system performance more stable.
Integrated access system:
Gas drainage monitoring system, ventilation fan monitoring system, underground drainage automatic control system, compressed air fan monitoring system, coal preparation plant monitoring system, lifting monitoring system, boiler room monitoring system, etc.
System performance:
1) Adopting an open TCP/IP protocol, it has strong compatibility and supports various signal access and conversion such as CAN/RS485 bus, making it easy to access various monitoring subsystems in mines;
2) Strong information integration capability, seamlessly integrating various subsystems to achieve information sharing and web queries;
3) Adopting redundant ring network and dual power supply working mode, a node or line failure does not affect the entire platform;
4) The transmission medium supports fiber optics, twisted pair cables, etc., meeting the branching characteristics of mine tunnels and having a flexible structure.
(Editor in charge: admin)