II. Description of the system:

1. About wireless communication network

The entire network is connected by a fixed-side wireless hub and a wireless Ethernet formed by a mobile-side wireless Ethernet client. On the fixed-side wireless hub, the monitoring computer and the NS are connected, and the wireless Ethernet client on the mobile side passes through the ethernet. The network is connected to the PLC. Through this wireless network, the host computer on the wireless HUB on the fixed side completes the monitoring of all PLCs, and the NS completes the PLC monitoring connected to it. The communication speed of the entire wireless network can reach 11Mbps and the distance can be reached. 300m.

2. With regard to the connection between PLC, laser range finder and absolute rotary encoder, in addition to the PROFIBUS-DP interface, the above two types of detection equipment also provide the DEVICENET interface; meanwhile, the laser range finder has RS-422/RS. -232 interface and analog output. So the PLC and their connection,

You can take the following connections:

1) Use DEVICENET connection, this method should be the best in terms of technology.
2) The laser range finder is connected through the serial port and communicates with the protocol macro. The absolute encoder is connected through the I/O port and uses the GRY instruction. This method needs to consider the response time of the entire system and decide whether it is feasible.

Annex IV: Wireless HUB (AP):
1) D-Link Air DWL-700AP (802.11b)

The D-Link Air DWL-700AP access node is designed to provide low-cost 2.4GHz wireless LAN users, but secure access to IEEE 802.11b wireless LANs. This access node implements a variety of functions such as bridging, repeater mode, etc. in conjunction with industry standards, and has enhanced IEEE 802.11i security features like WEP, TKIP, and AES to provide you with wireless LAN at an acceptable price. Interoperability and versatility.

This AP combines state-of-the-art chip technology and security features with fast data transfer and high reliability.

With an easy-to-use management interface, filtering of MAC, IP, URL, and other types of addresses is possible. The DWL-700AP can be set to any of the following operating modes: (1) as a wireless network access node; (2) as a point-to-point bridge device communicating with other access nodes; (3) as a point-to-multipoint wireless bridge device; (4) As a wireless client; (5) As a repeater. These features of the DWL-700AP allow you to flexibly configure the device. You can think of it as a visiting node in your home or office and within a normal wireless operating range, or when wireless users increase and you have to When expanding in scope, you can connect it to the most bridge or relay device to two or more wireless networks.

2) TP-Link TL-WA200

The TL-WA200 is based on the 802.11b standard and can provide up to 11Mbps transmission rate. The effective transmission distance is 120 meters indoors and 350 meters outdoors. With 256-bit WEP encryption, data transmission security is high. It also provides access to wireless network cards as a wireless AP.

As a point-to-point bridging device, it realizes the interconnection of multiple wireless networks and completes wireless network roaming; as a client, it realizes the interconnection of a wired network and a wireless network, and accesses the wireless network to the Ethernet. The TL-WA200 does not support WEB management, but it can be managed directly through the USB interface using the Utility, but many people are accustomed to WEB login. To avoid confusion, manufacturers do not specifically mention the default IP, and do not provide crossover cable, but comes with a USB cable.

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