Case study of wireless network technology (III)

In the previous article, we introduced the relevant industrial art basics and wireless communication technology applications in wireless network technology applications. For details, refer to "wireless network technology application case study 1". "wireless network technology application case study 2"). Next we will introduce the construction of wireless network units.

3. Wireless Network Unit

1) set up wireless client EC) 18, install one on each car, and connect to 150PLC through Ethernet cable. The wireless client has the roaming function, and automatically selects the wireless access point nearest to it based on the signal strength, so that the vehicle-mounted 150PLC can maintain good data communication with the ground ILC350 main PLC.

2) set up two Wireless Access Point APs. After testing, a wireless access point can be used to meet the communication requirements of the system. Finally, two wireless access points are adopted. On the one hand, a fault occurs on either of them, the other one can still ensure the normal operation of the network, play a hot standby role, and improve the reliability of the system; on the other hand, two wireless access points can be used to achieve Roaming Communication between wireless clients, when both wireless access points are normal, no matter where the car runs, the wireless client can maintain the communication distance from the wireless access point to ensure excellent communication quality. Field wireless access points and wireless clients and their settings are shown in "wireless network technology application case study 2)", figure 5) and figure 6.

4. Slip wire unit

The sliding wire unit consists of five power units and three control units in the new eight sliding wire system. Multiple power supplies and balanced compensation are used. The new set electrical appliance provides two-way functions, both output and input, it is highly flexible and maximizes the communication capability of the sliding line. When the wireless network system fails, the New Slip-wire system can remove the faulty circuit and enter the emergency mode. Using Three Control slip-wires, the vehicle can run properly in case of network exceptions.

New system features

1. Consistent Electrical Products

Both PLC and wireless products use Phoenix electric products. They are consistent, compatible, compact, and have minimal space.

2. wireless network technology applications bring direct benefits

1) the installation is simple and convenient, eliminating the need for installation and verification for hard line connections, greatly reducing the workload of on-site construction and minimizing the on-site transformation cycle.

2) It eliminates the drawbacks such as Jitter, interference, and loss that may easily occur in the contact mode of the sliding touch line, especially solves the fundamental problem of the limit on the amount of signal transmitted in the sliding touch line mode, and realizes the full collection of system information, it improves reliability and stability, and facilitates operation and maintenance.

3) provides a wireless access point for the system to solve the problem of connecting the vehicle-mounted system of the car to the ground. When debugging, parameter change, fault check, and maintenance of the on-board system, you do not need to use air operations or line control accompanying methods in the past, all controlled points of the system can be operated and monitored through wireless clients, such as laptops, anywhere in the coverage area of the wireless system.

4) The system interface is fully open, and debugging is simple and convenient, saving Development and debugging time.

3. high flexibility and easy scalability

To add a license in the future, you only need to add a vehicle-mounted control unit and a wireless client to the control system.

4. Security Assurance System

Through the Innovative Transformation of the slip line, we have developed a security assurance system. Even if a wireless fault occurs, the New Slip Line system can ensure non-stop line operation of the production line.

5. the positioning and recognition system is very advanced.

The advanced positioning and identification system has no mechanical wear, no reference point, absolute position measurement, and real-time detection, maximizing the intelligence of the car.

Conclusion

This project has now been transformed and achieved the goal of improving production capacity. At present, the project has passed the pre-acceptance. The application of wireless network technology has been stable since the beginning of debugging, and is the key to the success of this project. This project proves that Phoenix Electric's wireless network communication is reliable, and its application can make full use of its advantages in the automatic control system of the self-propelled vehicles, which is highly cost-effective. In China, wireless network technology is applied in the painting of the car transport system, in particular, it is a brand new attempt in the self-built loop car transformation project with a long sliding distance, a wide range and a large number of shards.