TRICON 9573-110

对SLE来讲，一个通讯中只有SC是接收器，有多个发送器（4线RS 485方式），每当SC发出信息给某台SLE，该SLE再发生信息给SC，SLE不发送信息时，其TX+、TX-输出电阻为高阻状态，从而不影响通讯内其他SLE发送数据，在任何时候一个通讯器只有一台SLE与SC通讯。 四、 遇到问题与解决方法 上海地铁AFC系统是从美国CTS公司引进的，实践证明车站网络是非常稳定与可靠的，但同时我们也发现，随着计算机技术的日新月异的发展，现在的Stallion板（ISA接口），已不能在新的计算机上使用（都是PCI接口），若要更换新的计算机，就必须使用PCI接口的Stallion板，但它不仅价格昂贵，而且在国内市场上买不到。为了解决这个问题，我们对市场进行了调研，结果发现MOXA C320与Stallion板功能一致，不过二者对端口的命名不一样，前者为tty a11~tty a18，后者为tty 1a00~tty 1a07，故应用程序不认MOXA端口。 由于SNC操作系统是SCO UNIXWARE，应用程序不能修改，因此只有对UNIX的相应参数进行改动才能解决问题，开始我们遇到了一定的困难，最后在MOXA公司的帮助下，将UNIX的/dev和/etc/inittab目录下的MOXA端口文件名改为相应的Stallion端口文件名，最后取得了成功。现在地铁票务维修车间，地铁培训中心，二号线河南中路站都先后安装了MOXA C320，结果令人满意，而它的价格只有Stallion板的四分之一。 另一个我们遇到的问题是：在BOM主机中有一块4串口板（Rocketport），它负责与车票处理单元（THU）和两个乘客显示屏（DISP）之间的通讯，但这块板没有光电隔离和突波保护，经常损坏，而且常伴随着BOM主机也被烧坏。当我们改用MOXA CP114IS后，上述现象没有发生过，但是如何用它的P4口取代7006板，我们遇到了问题，当它挂在通道上时，它与SC能正常通讯，通讯内的其他SLE只能收到SC信息，而SC收不到它们的信息，当MOXA公司有关人员了解到上述情况后非常热心，多次派人到现场观察了解情况，最后在分析了7006板的工作原理后，对CP114IS线路板进行了一些处理，顺利地解决了这一问题，这不仅使BOM结构变得简单，易于维修而且可节省一块价格不菲的7006板，我们在一号线人民广场站安装了3台用CP114IS的BOM进行试验，效果非常理想。 五、 结束语 上海地铁AFC系统车站RS 422/485网络与Ethernet比虽然不是最先进的网络，但它非常简单，稳定，可靠给我们留下了深刻的印象。system monitors the whole production process in real time, it can enable operators to clearly grasp all links of the production process and feed back production information in time. Therefore, the alarm protection can be carried out for each quantity requiring alarm, and the alarm mode and the upper and lower limits of the alarm can be manually set, which is very flexible and convenient for use. When the alarm arrives, the system will prompt the operator with sound, light, image and other alarm signals to deal with the fault in time, and can remember the alarm data. It has the function of accident recall, which provides real and effective data for future accident analysis, improves the safety production capacity, and greatly reduces the labor intensity of operators, Effectively ensure the operation of production. The automatic monitoring system saves a lot of maintenance costs, reduces the occurrence of production accidents, and brings considerable economic and social benefits. At the same time, the system has good protection functions, such as automatic pump shutdown under overpressure. 2. Improve the operation efficiency of the whole system and realize real-time report processing and multi-level management. The FOCS automatic monitoring system can automatically adjust the operation parameters of the system to make it run at the best efficiency point. Its report management function can automatically store, display, print and query the historical data of each link of production, Completely change the working mode of manual meter reading, calculation and preparation in the past. At the same time, leaders at all levels can master the operation dynamics at any time. 3. Improve the automatic production management capacity and reduce the labor intensity. The adoption of FOCS automatic monitoring system can make the operators clearly grasp all links of the whole production process, timely feed back the production information, improve the automatic production capacity, and