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一、前言 PT系列打字机是西德西门子公司为其可编程序控制器配套生产的打字机。近年来,随着整套工厂设备和单个可编程序控制器的引进,国内用户,特别是冶金企业所拥有的西门子公司的可编程序控制器越来越多,因而对打字机的需求量也在日益增加。但是,由于西门子公司的PT系列打字机价格昂贵,而且只能与其生产的可编程序控制器联机使用,因而使得用户不敢问津。针对这种情况,我们通过研究开发,选用了市场上比较多、价格便宜,且可多机使用的EPSON FX系列打字机来代替PT系列打字机。替代后的技术特性满足可编程序控制器的应用,并可作IBM-PC的打字机使用,而且经济效益明显,每台打字机可节约资金三千元左右。
I. INTRODUCTION The PT series typewriter is a typewriter that Siemens of West Germany manufactures for its programmable logic controller. Demand for typewriters is also growing in recent years with the introduction of complete plant equipment and a single programmable logic controller (PLC), and the increasing use of PLCs by domestic customers, especially those owned by metallurgical companies increase. However, Siemens’ PT Series typewriters are expensive and can only be used online with the programmable controllers they produce, making them inaccessible to users. In response to this situation, we adopted the research and development, the selection of the market more, cheap, and can be used more than the EPSON FX series typewriter to replace the PT series typewriter. Replacement of the technical features to meet the application of programmable logic controller, and can be used as a typewriter IBM-PC, but also obvious economic benefits, each typewriter can save money about three thousand yuan.