F271-IS  现场总线系统能够迅速响应现场设备的状态变化

Description

F271-IS  现场总线系统能够迅速响应现场设备的状态变化

现场总线端口是一种高性能的过程控制接口，F271-IS主要实现先进过程控制和多通道的通信管理。现场总线接口是一个16位的ISA卡，可以插入工业或商用PC机。

现场总线（Field bus）是近年来迅速发展起来的一种工业数据总线，它主要解决工业现场的智能化仪器仪表、控制器、执行机构等现场设备间的数字通信以及这些现场控制设备和高级控制系统之间的信息传递问题。

现场总线端口的通信协议通常是Modbus。Modbus是一种应用层的通信协议，它定义了在一个串行链路上设备如何相互通信的数据格式、同步方式、传送速度、传送步骤、检纠错方式以及控制字符定义等问题。Modbus协议可以遵循RS-485总线标准，而RS-485是现场总线物理层的一种实现方式。

现场总线通信协议F271-IS具有以下几个主要特点：

开放性：现场总线系统的协议是公开的，不同厂商的设备之间可以实现互联、互换，不同设备之间组成了一个开放的系统。这为用户提供了灵活的选择，可以方便地选用不同厂商的现场总线产品来构建实际的控制系统。

实时性：系统具有较高的数据传输率，每个节点都可以及时收发信息。这使得现场总线系统能够迅速响应现场设备的状态变化，并做出相应的控制决策。

互操作性：设备与设备之间、系统与系统之间可以实现点对点的、一点对多点的数字通信。这意味着不同厂商的控制设备不仅可以互相通信，而且可以统一组态，实现统一的控制策略和“即插即用”。

现场设备智能化：设备具有自诊断、传感测量、工程量处理与控制、补偿计算等功能。这使得现场设备能够自主地进行数据处理和控制，减轻了中央控制器的负担。

安全性与可靠性：现场总线系统通常具有防爆等级合乎要求、抗干扰能力强、运行稳定等特点。这保证了在恶劣的工业环境下，系统能够稳定可靠地运行。

经济性：系统的安装、运行、维护、升级等可以较好地节省费用。由于现场总线系统采用了标准化的通信协议和开放的系统结构，使得设备的选型和配置更加灵活，降低了系统的总体成本。

F271-IS  现场总线系统能够迅速响应现场设备的状态变化

Fieldbus port is a kind of high performance process control interface. F271-IS mainly realizes advanced process control and multi-channel communication management. The fieldbus interface is a 16-bit ISA card that can be plugged into an industrial or commercial PC.

Field bus (Field bus) is a kind of industrial data bus developed rapidly in recent years, which mainly solves the digital communication between the intelligent instruments, controllers, actuators and other field equipment in the industrial field, and the information transmission problem between these field control equipment and advanced control system.

The communication protocol for fieldbus ports is usually Modbus. Modbus is an application layer communication protocol, which defines how devices communicate with each other on a serial link, such as data format, synchronization mode, transmission speed, transmission steps, error detection and correction mode and control character definition. The Modbus protocol can follow the RS-485 bus standard, and RS-485 is an implementation of the physical layer of fieldbus.

The fieldbus communication protocol F271-IS has the following main features:

Openness: The protocol of the fieldbus system is open, and the devices of different manufacturers can be interconnected and exchanged, and an open system is formed between different devices. This provides users with a flexible choice, can easily choose different manufacturers of fieldbus products to build the actual control system.

Real-time: The system has a high data transmission rate, and each node can send and receive information in time. This enables the fieldbus system to respond quickly to the state changes of the field equipment and make corresponding control decisions.

Interoperability: point-to-point, point-to-multipoint digital communication can be achieved between devices and systems. This means that the control devices of different manufacturers can not only communicate with each other, but also can be unified configuration to achieve a unified control strategy and “plug and play”.

Intelligent field equipment: The equipment has self-diagnosis, sensing and measurement, engineering quantity processing and control, compensation calculation and other functions. This enables data processing and control to be carried out autonomously by the field equipment, reducing the burden on the central controller.

Safety and reliability: The fieldbus system usually has the characteristics of explosion-proof level meeting the requirements, anti-interference ability, stable operation and so on. This ensures stable and reliable operation of the system in harsh industrial environments.

Economy: The installation, operation, maintenance and upgrade of the system can save costs. Because the fieldbus system adopts standardized communication protocol and open system structure, the selection and configuration of equipment are more flexible, and the overall cost of the system is reduced.