Based on Industrial 4G RTU PLC Wireless Remote Control System

I. Overview

PLC = Programmable Logic Controller, a programmable logic controller, an electronic system for digital computing operations designed for industrial environments. It uses a class of programmable memory for its internal memory program, performing user-oriented instructions such as logic operations, sequence control, timing, counting and arithmetic operations, and controlling various types of machinery through digital or analog input/output or the production process.

II. Changes in the development trend of PLC communication methods:

PLC communication methods mainly include RS232, RS485, PPI/MPI, PROFIBUS DP/PA/FMS field bus, Ethernet bus, DEVICEnet bus, and wireless network.

With the limitations of local communication control, remote control of networked communication, slowly adopting wired and wireless methods to enter the mainstream. Ethernet port communication and wireless network communication slowly replaced the original local serial port or bus mode control in PLC remote control.



III. PLC wireless remote control uses the advantages of wireless

3.1, Simplify engineering and reduce wiring costs:

The 433m Networking mode is used to realize the wiring of the RS485 bus. The wireless CM550 realizes point-to-point (point-to-multipoint) wireless communication. Eliminating the cost of manual wiring and simplifying the progress of the project.

3.2, Reduce operating and maintenance costs:
The wireless self-organizing network is used to summarize the unified management and monitoring of the touch screen configuration, and there is a cascaded wireless communication module to realize the remote management control of the remote networking king software, and reduce the manual inquiry to realize the unattended operation system. Improve the centralized remote management interface, realize remote management control, and reduce post-operation and maintenance costs.
3.3, SMS control and query to improve the randomness of remote control:
CM550 is a wireless acquisition and transmission control terminal. It can realize remote human-machine interface control of remote and Kingview software. It also has SMS receiving center and SMS control function. It can query PLC real-time analog quantity, switch quantity and other information at any time. The remote configuration modification and remote parameter configuration of the PLC are realized by the short message command mode.
3.4, data transmission is safe and reliable
The 2G/3G/4G network standard is adopted to ensure the coverage and popularization of the network, and the operator APN/VPN is supported. The encrypted communication mode effectively ensures the security of the APN private network data communication. At the same time, it can also superimpose the DES, AES and 3DES self-encryption modes of the CM550 to realize single-layer/double-layer wireless encryption. Ensure data communication is safe and reliable. There is a guarantee of the safety and effectiveness of industrial automation control.

IV. Network networking topology and field application diagram

V. Function and application of products in the system
The system adopts the front-end 433M wireless independent network equipment CM530, realizes the point-to-multipoint PLC master-slave relationship application through the modbus RTU protocol through the RS485 bus, and realizes the local wireless remote distance monitoring through the serial line and the touch screen software. Wireless remote man-machine interface management and monitoring is realized through the bus and CM510 products through the GPRS/CDMA network through the configuration king software virtual serial port (IO/device).
CM550 RTU have been used in various industrial automation industry applications, reliable industrial design standards, and ten years of wireless communication. It ensures the stable operation of the customer in the harsh industrial environment of 24*7 hours unattended in various industrial project applications, fully reflecting the reliability and stability of PLC wireless remote control.
At present, PLC wireless remote control has been widely used in steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automotive, textile, transportation, environmental protection, water treatment and other industries. In the future, other spaces in the field of industrial automation will be popularized and new application areas will be explored.