YNT512D YOKOGAWA技术规格

YNT512D从起源和发展来说 DCS是从传统的仪表盘发展而来。因此，DCS从先天性来说较为侧重仪表的控制。 PLC从传统的继电器回路发展而来的，最初的PLC甚至没有模拟量的处理能力。因此，PLC从开始就强调的是逻辑运算能力。

YNT512D从系统的可扩展性和兼容性的方面来说 DCS在发展的过程中，虽然是各厂家自成体系，但大多数系统的内部通讯协议不尽相同，但操作级的网络平台都选用了以太网络，只要网络到的地方，就可以随意增减节点数量和布置节点位置。另外，新型的通用操作站，基于windows系统的OPC、DDE等开放协议，各系统也可以很方便的通讯，以实现资源共享。 对于PLC系统来说，很少有扩展的需求，因为PLC系统一般针对于设备来使用。一般来讲，PLC少有兼容性的要求，比如两个或两个以上的系统要求资源共享，对PLC来讲也是很困难的事。而且PLC一般都采用专用的网络结构，比如西门子的MFI总线型网络，甚至增加一台操作员站都不容易或成本很高。但随着科技的发展，PLC的可拓展性也越来越强。

YNT512D从使用的数据库来说 DCS一般都提供统一的数据库。比如在组态软件中，在监控软件中，在趋势图中，在报表中…… PLC系统的数据库通常都不统一，组态软件和监控软件甚至归档软件都是自己的数据库。人们常说西门子的S7－400要到了414以上使用了PCS7系统（使用统一数据库的系统）才能称为DCS，就是这个道理。

YNT512D From the origin and development, DCS is developed from the traditional instrument panel. Therefore, DCS is inherently focused on instrument control. PLC developed from the traditional relay circuit, and the original PLC didn’t even have the processing capacity of analog signals. Therefore, from the beginning, PLC emphasizes the ability of logical operation.

YNT512D from the aspect of system scalability and compatibility, in the process of DCS development, although each manufacturer has its own system, the internal communication protocols of most systems are not the same. However, Ethernet is used as the operating network platform, so as long as the network reaches the place, the number of nodes can be increased or decreased and the location of nodes can be arranged at will. In addition, the new general operating station, based on the open protocols such as OPC and DDE of windows system, can also communicate with each other conveniently to realize resource sharing. For PLC system, there is little demand for expansion, because PLC system is generally used for equipment. Generally speaking, PLC has few compatibility requirements, for example, two or more systems require resource sharing, which is also very difficult for PLC. Moreover, PLC generally adopts a dedicated network structure, such as Siemens’ MFI bus network, and even adding an operator station is not easy or costly. But with the development of science and technology, the expandability of PLC is becoming stronger and stronger.

YNT512D DCS generally provides a unified database from the database used. For example, in configuration software, monitoring software, trend charts and reports, the databases of PLC systems are usually not uniform, and configuration software, monitoring software and even archiving software are all their own databases. It’s often said that Siemens S7-400 can’t be called DCS until the PCS7 system (the system using the unified database) is above 414, which is the reason.

YNT512D

YNT512D

YNT512D

YNT512D

YNT512D