PR6423/011-131 CON031传感器

PR6423/011-131 CON031传感器

产品详情资料

PLC系统与DCS系统的结构差异不大，只是在功能的着重点上的不同，DCS着重于闭环控制及数据处理。PLC着重于逻辑控制及开关量的控制，也可实现模拟量控制。

DCS的特点是：（1）控制功能强。可实现复杂的控制规律，如串级、前馈、解耦、自适应、优和非线性控制等。也可实现顺序控制。（2）系统可靠性高。（3）采用CRT操作站有良好的人机界面。（4）软硬件采用模块化积木式结构。（5）系统容易开发。（6）用组态软件，编程简单，操作方便。（7）有良好的性价比。

（1）系统能处理多少I/O信息。

（3）能适应多少用户和装置（CRT、控制站等）。

（5）数据公路的大允许长度是多少。

（7）数据公路是否能支持由其它制造厂生产的硬件（可编程序控制器、计算机、数据记录装置等）。为保证通信的完整，大部分DCS或PLC厂家都能提供冗余数据公路。

目前在DCS和PLC系统中一般使用两类通信手段，即同步的和异步的，同步通信依靠一个时钟信号来调节数据的传输和接收，异步网络采用没有时钟的报告系统。

英文产品详细信息

1 DCS or PLC

The structure difference between PLC system and DCS system is not significant, but only in terms of functional focus. DCS focuses on closed-loop control and data processing. PLC focuses on logic control and switch quantity control, and can also achieve analog quantity control.

The key to DCS or PLC systems is communication. It can also be said that the data highway is the backbone of the distributed control system DCS and PLC. Due to its task of providing a communication network between all components of the system, the design of the data highway itself determines the overall flexibility and security. The media for the data highway can be a twisted pair, coaxial cable, or fiber optic cable.

The characteristics of DCS are: (1) strong control function. It can achieve complex control laws, such as cascade, feedforward, decoupling, adaptive, optimal, and nonlinear control. Sequential control can also be achieved. (2) High system reliability. (3) The CRT operation station has a good human-machine interface. (4) The software and hardware adopt a modular building block structure. (5) The system is easy to develop. (6) Using configuration software, programming is simple and operation is convenient. (7) Has good cost-effectiveness.

Through the design parameters of the data highway, it is basically possible to understand the relative advantages and disadvantages of a specific DCS or PLC system.

(1) How much I/O information can the system process.

(2) How much control loop information can the system handle related to control.

(3) How many users and devices (CRT, control station, etc.) can be accommodated.

(4) How is the integrity of transmitted data thoroughly checked.

(5) What is the maximum allowable length of the data highway.

(6) How many branches can the data highway support.

(7) Can the data highway support hardware produced by other manufacturers (programmable controllers, computers, data recording devices, etc.). To ensure the integrity of communication, most DCS or PLC manufacturers can provide redundant data highways.

To ensure the security of the system, complex communication protocols and error detection techniques were used. The so-called communication protocol is a set of rules used to ensure the reception and transmission of transmitted data.

Currently, two types of communication methods are commonly used in DCS and PLC systems, namely synchronous and asynchronous. Synchronous communication relies on a clock signal to regulate data transmission and reception, while asynchronous networks use a reporting system without a clock.

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