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工业上对各种设备的运行情况进行监视是最常见的一项任务,当然最直观的方法莫过于把所有设备的运转信号直接通往监视中心进行显示,但这种方法传输线太多,成本高,维修困难。本文给出一种简单灵巧的设备巡检方式,能有效地避免这些问题。基本原理是通过编码扫描的方式,把每台设备分配一个固定的地址,控制器对每一台设备进行逐个扫描时,选通相应的门,使设备的运行信号通过一条公用传输线送回监视中心,这样从现场至监视中心只需要有一条公用回输线,和几条输入至现场的地址扫描线即可。下面我们以扫描128台设备为例来说明这种方法。图1为现场的扫描选通部分,图中54LS150为16选1电路。54LS152为8选1电路。图2为监视中心的控制
Industry is the most common task of monitoring the operation of various devices, of course, the most intuitive way than all the equipment running signal directly to the monitoring center for display, but this method too much transmission line, high cost Maintenance difficulties. This article gives a simple and smart device inspection methods, which can effectively avoid these problems. The basic principle is that by code scanning, each device is assigned a fixed address. When the controller scans each device one by one, the corresponding gate is gated so that the operation signal of the device is sent back to the monitoring center via a common transmission line , So from the scene to the surveillance center only need to have a common return line, and several input to the site address scan line can be. Here we scan the 128 devices as an example to illustrate this method. Figure 1 for the site scan gating section, the figure 54LS150 for 16 election 1 circuit. The 54LS152 is an 8-out-of-1 circuit. Figure 2 for the monitoring center control