掛接現(xiàn)場總線隔離模塊(FBI)，每塊FBI下面可通過現(xiàn)場總線接入24塊輸入/輸出現(xiàn)場總線組件(FBM)?，F(xiàn)場總線采用的協(xié)議為IEEE1118，為總線結(jié)構(gòu)形式，信號(hào)傳送方式是載波監(jiān)聽多路碰撞協(xié)議。如果采用雙絞線和FBI模塊，傳輸距離為1200m，大距離可達(dá)1800m，數(shù)據(jù)傳輸速率268.75kb/s。 二 鍋爐DCS系統(tǒng)的硬件 1.AW51D AW51D具有應(yīng)用處理機(jī)和操作員站處理機(jī)的雙重功能。它既可作為一個(gè)應(yīng)用處理機(jī)承擔(dān)網(wǎng)絡(luò)上的服務(wù)器功能，同時(shí)又可作為一個(gè)人機(jī)接口。 2.WP51D WP51D操作站處理機(jī)和與它連接的外部設(shè)備一起為用戶和所有系統(tǒng)功能之間提供一個(gè)界面，即作為系統(tǒng)站和操作員之間的接口。 3.控制處理機(jī)CP 控制處理機(jī)和與它相連的現(xiàn)場總線組件(FBM)一起，按組態(tài)好的控制方案對鍋爐操作過程進(jìn)行控制。它可實(shí)現(xiàn)連續(xù)控制、梯型邏輯控制和順序控制，以及完成數(shù)據(jù)采集、檢測、報(bào)警和傳送信息的功能。 4.通信處理機(jī)COMMP10 COMMP10提供了使I/A Series的其他站點(diǎn)與VT100終端、打印機(jī)以及調(diào)制解調(diào)器進(jìn)行通信的功能。它有4個(gè)RS-423(與RS-232-C完全兼容)串行接口，其異步傳輸速率為9.6kb/s，可連接80/132打印機(jī)(可選中文打印機(jī))、彩色噴墨打印機(jī)、VT100字符終端、調(diào)制解調(diào)器以及PC機(jī)等。 5.過程I/O接口組件FBM 所有的接口硬件，包括接線端子、連接電纜、輸入輸出卡件以及其他相關(guān)設(shè)備都安裝在主機(jī)房的機(jī)柜中，機(jī)柜符合NEMA12標(biāo)準(zhǔn)。 過程輸入/輸出卡件提供了現(xiàn)場信號(hào)與控制器之間的接口，過程 I/O 卡全部為隔離型，采用過流保護(hù)電路，無保險(xiǎn)絲，保證了系統(tǒng)的可靠運(yùn)行。 接口組件FBM有下列幾種： (1)FBM01(4~20mA輸入組件) 接收信號(hào): 具有8路0~20mA DC模擬量輸入通道，每路通道可接受1個(gè)二線制模擬量傳感器輸入。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.