4000093-306 TRICONEX PLC 顺序控制​

4000093-306 TRICONEX PLC 顺序控制

因为控制的方式不同，以前大家分为过程控制和顺序控制或者离散控制两类，其中过程控制来源于早期的过程仪表控制，后逐步发展为DCS，而顺序控制来源于早期的继电器组，后发展出了PLC，但随着微电子、软件、硬件和通信技术的发展，目前很多DCS和PLC都采用同样的或者类似技术平台，双方之间区别越来越小，大多数新一代的控制系统都不再区分DCS或者PLC，不过新一代控制器是否叫PLC还是DCS或者FCS、PAC、NCS，这并没有得到广大厂商的认同。

特别是网络和现场总线的发展，使DCS越来越没有单独存在的价值，很多的大公司都把新一代的控制系统合并了DCS、PLC、IPC、FCS功能。

为了简化各种概念，我们根据项目的大小、项目的重复度把PLC的应用分为工程和OEM两部分，其中工程主要指造纸、石化、、水泥、大型港机等项目特征明显的自动化系统，而OEM主要指各种使用PLC的装备，如电梯、挤出机、包装机、回流焊、点胶机、特种车辆等，”这两大块构成了PLC的主要的市场。

4000093-306 TRICONEX PLC 顺序控制

Because of the different ways of control, we were previously divided into process control and sequence control or discrete control two categories, in which process control came from the early process instrument control, and gradually developed into DCS, and sequence control came from the early relay group, and later developed PLC, but with the development of microelectronics, software, hardware and communication technology, At present, many DCS and PLC are using the same or similar technology platform, the difference between the two sides is getting smaller and smaller, most of the new generation of control systems are no longer distinguish DCS or PLC, but whether the new generation of controller is called PLC or DCS or FCS, PAC, NCS, which has not been recognized by the majority of manufacturers.

In particular, the development of network and fieldbus, DCS more and more do not have the value of existence alone, many large companies have a new generation of control systems combined DCS, PLC, IPC, FCS functions.

In order to simplify various concepts, we divide the application of PLC into engineering and OEM according to the size of the project and the repeatability of the project, of which engineering mainly refers to the automation system with obvious characteristics of paper making, petrochemical, cement, large port machinery and other projects, and OEM mainly refers to various equipment using PLC. Such as elevators, extruders, packaging machines, reflow soldering, dispensing machines, special vehicles, etc., "these two blocks constitute the main market for PLC.