挂接现场总线隔离模块(FBI)，每块FBI下面可通过现场总线接入24块输入/输出现场总线组件(FBM)。现场总线采用的协议为IEEE1118，为总线结构形式，信号传送方式是载波监听多路碰撞协议。如果采用双绞线和FBI模块，传输距离为1200m，大距离可达1800m，数据传输速率268.75kb/s。 二 锅炉DCS系统的硬件 1.AW51D AW51D具有应用处理机和操作员站处理机的双重功能。它既可作为一个应用处理机承担网络上的服务器功能，同时又可作为一个人机接口。 2.WP51D WP51D操作站处理机和与它连接的外部设备一起为用户和所有系统功能之间提供一个界面，即作为系统站和操作员之间的接口。 3.控制处理机CP 控制处理机和与它相连的现场总线组件(FBM)一起，按组态好的控制方案对锅炉操作过程进行控制。它可实现连续控制、梯型逻辑控制和顺序控制，以及完成数据采集、检测、报警和传送信息的功能。 4.通信处理机COMMP10 COMMP10提供了使I/A Series的其他站点与VT100终端、打印机以及调制解调器进行通信的功能。它有4个RS-423(与RS-232-C完全兼容)串行接口，其异步传输速率为9.6kb/s，可连接80/132打印机(可选中文打印机)、彩色喷墨打印机、VT100字符终端、调制解调器以及PC机等。 5.过程I/O接口组件FBM 所有的接口硬件，包括接线端子、连接电缆、输入输出卡件以及其他相关设备都安装在主机房的机柜中，机柜符合NEMA12标准。 过程输入/输出卡件提供了现场信号与控制器之间的接口，过程 I/O 卡全部为隔离型，采用过流保护电路，无保险丝，保证了系统的可靠运行。 接口组件FBM有下列几种： (1)FBM01(4~20mA输入组件) 接收信号: 具有8路0~20mA DC模拟量输入通道，每路通道可接受1个二线制模拟量传感器输入。
Attach fieldbus isolation module (FBI), and 24 input / output fieldbus components (FBM) can be connected under each FBI through fieldbus. The protocol adopted by fieldbus is ieee1118, which is a bus structure. The signal transmission mode is carrier monitoring multi-channel collision protocol. If twisted pair and FBI module are used, the transmission distance is 1200m, the maximum distance can reach 1800m, and the data transmission rate is 268.75kb/s. II. Hardware of boiler DCS System 1 Aw51d aw51d has dual functions of application processor and operator station processor. It can be used not only as an application processor to undertake the server function on the network, but also as a man-machine interface. 2. Wp51d wp51d operation station processor and external equipment connected with it provide an interface between users and all system functions, that is, as the interface between system station and operator. 3. Control processor CP control processor and its connected field bus module (FBM) control the boiler operation process according to the configured control scheme. It can realize continuous control, ladder logic control and sequence control, and complete the functions of data acquisition, detection, alarm and information transmission. 4. Communication processor commp10 commp10 provides the function of communicating other sites of I / a series with VT100 terminal, printer and modem. It has four rs-423 (fully compatible with RS-232-C) serial interfaces, and its asynchronous transmission rate is 9.6kb/s. It can connect 80 / 132 printer (optional Chinese printer), color inkjet printer, VT100 character terminal, modem and PC. 5. All interface hardware of the process I / O interface component FBM, including wiring terminals, connecting cables, input and output cards and other related equipment, are installed in the cabinet in the host room, which complies with nema12 standard. The process input / output card provides the interface between the field signal and the controller. All the process I / O cards are isolated, adopt overcurrent protection circuit and have no fuse to ensure the reliable operation of the system. The interface component FBM has the following types: (1) fbm01 (4 ~ 20mA input component) receives signals: it has eight 0 ~ 20mA DC analog input channels, and each channel can accept the input of one two-wire analog sensor.
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