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智能工业无线通讯解决方案—现代仓储物流的理想选择

项目介绍:
In order to improve the lower response and inefficient management of traditional logistics, the modern intelligent warehouse advocates adopting the latest Automated Guided Vehicle (AGV) system to greatly increase the intelligent level of logistics warehousing management as well as enhancing the system efficiency.

An AGV (Automated Guided Vehicle) is a battery powered driverless truck equipped with electromagnetic, optical or other automated guidance devices to automatically move them along the guide path. AGV’s provide safety protection and a variety of functions for the carrying and movement of goods. Typically its route and behavior are controlled by a computer system and the electromagnetic guidance system can also set up the AGV’s traveling route and can enable the vehicles to follow the path signals to move and carry.

For the purposes of reducing the complex operation and labor resources, the modern warehouse needs high-speed, convenient logistics channels while its automation application should be upgraded to the next level to ensure the quick response and shorten the transport time of materials so as to maximize the plant’s productivity. An AGV system is compatible with the needs of an intelligent warehouse since they play an important role in quick logistics and intelligent management. But how is the status of the AGV controlled when goods are being transported and loaded and how is the safe transfer of goods from warehouse to production line guaranteed and given greater priority? It is these issues and more that have become essential for logistics engineers when programming AGV’s.

项目实施:
AGV车辆通讯系统由无线AP、串口服务器、组态软件三部分组成。通讯网络采用无线通信,通过无线AP与车辆的终端进行连接,确保通讯即稳定又便捷。

研华的EKI-6311GN是一款高性能的带有控制器无线AP,支持IEE802.11n协议,其传输速率为传统802.11g产品的3倍以上。EKI-6311GN还支持STP和IGMP Snooping等协议,能够非常有效的改善无线网络连接的质量,在网络安全方面,EKI-6311GN提供目前已经发布的所有加密方式,如64/128/512位WEP加密以及WPA2/WPA/802.1x等加密方式,为网络传输提供有利的安全保证。另外6311GN还支持PoE的电源供电方式,极大方便现场电源的连接。

无线串口服务器将串口数据透明传输至无线以太网络,一端串口连接的是AGV车载PLC,另外一端采用WiFi进行通讯。研华的EKI-1351是一款支持802.11b/g协议的无线串口服务器,可以通过WiFi高效的连接到主机,将基于RS-232/422/485的串口数据传输到上位机程序进行监控。

工业组态软件在自动数据采集和控制系统中都有广泛的应用。从控制特定硬件接口的设备驱动程序到数据读取都担当着重要的角色。研华WebAccess组态软件一种是基于浏览器B/S架构的优秀工控组态软件,允许用户方便的通过浏览器软件进行远程甚至是跨越互联网的远程控制和配置。WebAccess采用中央数据库和分布式系统架构设计理念,它是一款功能强大,集成采集自动化工具、人机界面/监控应用于一体的完整监控组态软件。

设备选型:

Product Description

EKI-6311GN

IEEE 802.11 b/g/n Wireless Access Point/Client Bridge

EKI-1351

1-port RS-232/422/485 to 802.11b/g WLAN Serial Device Server

WebAccess

A browser-based software package for HMI and SCADA devices

系统架构图:

系统需求:
物流管理一直以来是制造企业提高生产效率、节约成本的一个重要环节,特别是对于汽车制造业而言,其重要意义更是毋庸置疑。汽车生产车间面积巨大,大量AGV小车在总面积约10000平方米的区域内自动行走,监控中心需要读取AGV小车的运行状态,以及及时读取到小车的故障和报警,并针对不同的状况控制AGV小车的具体动作,系统必须要实时性和准确性。保证AGV车辆监控系统安全、稳定、高效运行,提高汽车生产线的效率显得尤为重要。此项目中,鉴于AGV小车的工作模式,小车与监控中心的通讯决定采用无线通讯的方式,以下为具体的通讯方案:

AGV车辆监控系统主要由组态控制软件、无线通讯系统及车载PLC三部分组成,其中,通讯系统由无线AP、无线串口服务器产品构成,无线AP安装于车间的不同区域,无线串口服务器安装在AGV小车车体内部,建立起无线连接。系统具备快速漫游功能,可使无线串口服务器快速地连接信号强度最佳的无线AP,确保监控中心与现场运动中AGV车辆的可靠通讯。

总结
在本项目的应用中,研华灵活高效的WebAccess组态软件、高效率、高功率抗干扰能力强的工业无线AP产品EKI-6311GN、以及实现无缝串行协议与网络协议转换的无线串口服务器产品EKI-1351,为AGV车辆监控系统安全、稳定、高效运行提供了坚实的保障。

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