a06b-6057-h001

為了保證系統(tǒng)的安全性，使用了復(fù)雜的通信規(guī)約和檢錯(cuò)技術(shù)。所謂通信規(guī)約就是一組規(guī)則，用以保證所傳輸?shù)臄?shù)據(jù)接收與發(fā)送。

目前在dcs和plc系統(tǒng)中一般使用兩類(lèi)通信手段，即同步的和異步的，同步通信依靠一個(gè)時(shí)鐘信號(hào)來(lái)調(diào)節(jié)數(shù)據(jù)的傳輸和接收，異步網(wǎng)絡(luò)采用沒(méi)有時(shí)鐘的報(bào)告系統(tǒng)。

2.1.2 fcs

fcs具有

（1）很好的開(kāi)放性、互操作性和互換性。

（2）全數(shù)字通信。

（3）智能化與功能自治性。

（4）高度分散性。

（5）很強(qiáng)的適用性。

fcs的關(guān)鍵要點(diǎn)有三點(diǎn)：

1．fcs系統(tǒng)的核心是總線協(xié)議，即總線標(biāo)準(zhǔn)。

采用雙絞線、光纜或無(wú)線電方式傳輸數(shù)字信號(hào)，減少大量導(dǎo)線，提高了可靠性和抗干擾能力。fcs從傳感器、變送器到調(diào)節(jié)器一直是數(shù)字信號(hào)，這就使我們很容易地處理更復(fù)雜、更的信號(hào)，同時(shí)數(shù)字通信的差錯(cuò)功能可檢出傳輸中的誤碼。

fcs可以將pid控制徹底分散到現(xiàn)場(chǎng)設(shè)備（field device）中?；诂F(xiàn)場(chǎng)總線的fcs又是全分散、全數(shù)字化、全開(kāi)放和可互操作的新一代生產(chǎn)過(guò)程自動(dòng)化系統(tǒng)，它將取代現(xiàn)場(chǎng)一對(duì)一的4～20ma模擬信號(hào)線，給傳統(tǒng)的工業(yè)自動(dòng)化控制系統(tǒng)體系結(jié)構(gòu)帶來(lái)革命性的變化。

根據(jù)iec61158的定義，現(xiàn)場(chǎng)總線是安裝在制造或過(guò)程區(qū)域的現(xiàn)場(chǎng)裝置與控制室內(nèi)的自動(dòng)控制裝置之間的數(shù)字式、雙向傳輸、多分支結(jié)構(gòu)的通信網(wǎng)絡(luò)?，F(xiàn)場(chǎng)總線使測(cè)控設(shè)備具備了數(shù)字計(jì)算和數(shù)字通信能力，提高了信號(hào)的測(cè)量、傳輸和控制精度，提高了系統(tǒng)與設(shè)備的功能、性能。iec/tc65的sc65c/wg6工作組于1984年開(kāi)始致力于推出世界上單一的現(xiàn)場(chǎng)總線標(biāo)準(zhǔn)工作，走過(guò)了16年的艱難歷程，于1993年推出了iec61158-2，之后的標(biāo)準(zhǔn)制定就陷于混亂。2000年初公布的iec61158現(xiàn)場(chǎng)總線子集有八種，分別為：

①類(lèi)型1 iec技術(shù)報(bào)告（ffh1）；②類(lèi)型2 control-net（美國(guó)rockwell公司支持）；③類(lèi)型3 profibus（德國(guó)siemens公司支持）；④類(lèi)型4 p-net（丹麥process data公司支持）；⑤類(lèi)型5 ffhse（原ffh2）高速以太網(wǎng)（美國(guó)fisher rosemount公司支持）；⑥類(lèi)型6 swift-net（美國(guó)波音公司支持）；⑦類(lèi)型7 worldfip（法國(guó)alsto公司支持）；⑧類(lèi)型8 interbus（美國(guó)phoenix contact公司支持）。

除了iec61158的8種現(xiàn)場(chǎng)總線外，iec tc17b通過(guò)了三種總線標(biāo)準(zhǔn)：sds（smart distributed system）；asi（actuator sensor interface）；device net。另外，iso公布了iso 11898 can標(biāo)準(zhǔn)。其中device net于2002年10月8日被中國(guó)批準(zhǔn)為國(guó)家標(biāo)準(zhǔn)，并于2003年4月1日開(kāi)始實(shí)施。

所以，要實(shí)現(xiàn)這些總線類(lèi)型的相互兼容和互操作，就目前狀態(tài)而言，幾乎是不可能的。開(kāi)放的現(xiàn)場(chǎng)總線控制系統(tǒng)的互操作性，就一個(gè)特定類(lèi)型的現(xiàn)場(chǎng)總線而言，只要遵循同一類(lèi)型現(xiàn)場(chǎng)總線的總線協(xié)議，對(duì)其產(chǎn)品是開(kāi)放的，并具有互操作性。換句話說(shuō)，不論什么廠家的產(chǎn)品，只要遵循同一類(lèi)型總線的總線協(xié)議，產(chǎn)品之間是開(kāi)放的，并具有互操作性，就可以組成總線網(wǎng)絡(luò)。

另外，fcs還可以通過(guò)網(wǎng)關(guān)和企業(yè)的上級(jí)管理網(wǎng)絡(luò)相連，以便管理者掌握第一手資料，為決策提供依據(jù)。所以現(xiàn)場(chǎng)總線具有開(kāi)放性、互操作性、系統(tǒng)結(jié)構(gòu)的高度分散性、靈活的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)、現(xiàn)場(chǎng)設(shè)備的高度智能化、對(duì)環(huán)境的高度適應(yīng)性等諸多突出特點(diǎn)。

2．fcs系統(tǒng)的基礎(chǔ)是數(shù)字智能現(xiàn)場(chǎng)裝置

控制功能下放到現(xiàn)場(chǎng)儀表中，控制室內(nèi)儀表裝置主要完成數(shù)據(jù)處理、監(jiān)督控制、優(yōu)化控制、協(xié)調(diào)控制和管理自動(dòng)化等功能。

數(shù)字智能現(xiàn)場(chǎng)裝置是fcs系統(tǒng)的硬件支撐，是基礎(chǔ)；道理很簡(jiǎn)單，fcs系統(tǒng)執(zhí)行的是自動(dòng)控制裝置與現(xiàn)場(chǎng)裝置之間的雙向數(shù)字通信現(xiàn)場(chǎng)總線信號(hào)制。現(xiàn)場(chǎng)裝置必須遵循統(tǒng)一的總線協(xié)議，即相關(guān)的通訊規(guī)約，具備數(shù)字通信功能，能實(shí)現(xiàn)雙向數(shù)字通。再一點(diǎn)，現(xiàn)場(chǎng)總線的一大特點(diǎn)就是要增加現(xiàn)場(chǎng)一級(jí)控制功能。

3．fcs系統(tǒng)的本質(zhì)是信息處理現(xiàn)場(chǎng)化

對(duì)于一個(gè)控制系統(tǒng)，無(wú)論是采用dcs還是采用現(xiàn)場(chǎng)總線，系統(tǒng)需要處理的信息量至少是一樣多的。實(shí)際上，采用現(xiàn)場(chǎng)總線后，可以從現(xiàn)場(chǎng)得到更多的信息?，F(xiàn)場(chǎng)總線系統(tǒng)的信息量沒(méi)有減少，甚至增加了，而傳輸信息的線纜卻大大減少了。這就要求一方面要大大提高線纜傳輸信息的能力，另一方面要讓大量信息在現(xiàn)場(chǎng)就地完成處理，減少現(xiàn)場(chǎng)與控制機(jī)房之間的信息往返?？梢哉f(shuō)現(xiàn)場(chǎng)總線的本質(zhì)就是信息處理的現(xiàn)場(chǎng)化。

由現(xiàn)場(chǎng)智能儀表完成數(shù)據(jù)采集、數(shù)據(jù)處理、控制運(yùn)算和數(shù)據(jù)輸出等功能?，F(xiàn)場(chǎng)儀表的數(shù)據(jù)（包括采集的數(shù)據(jù)和診斷數(shù)據(jù)）通過(guò)現(xiàn)場(chǎng)總線傳送到控制室的控制設(shè)備上，控制室的控制設(shè)備用來(lái)監(jiān)視各個(gè)現(xiàn)場(chǎng)儀表的運(yùn)行狀態(tài)，保存智能儀表上傳的數(shù)據(jù)，同時(shí)完成少量現(xiàn)場(chǎng)儀表無(wú)法完成的控制功能。

2.2 典型系統(tǒng)比較

通過(guò)使用現(xiàn)場(chǎng)總線，用戶(hù)可以大量減少現(xiàn)場(chǎng)接線，用單個(gè)現(xiàn)場(chǎng)儀表可實(shí)現(xiàn)多變量通信，不同制造廠生產(chǎn)的裝置間可以完全互操作，增加現(xiàn)場(chǎng)一級(jí)的控制功能，系統(tǒng)集成大大簡(jiǎn)化，并且維護(hù)十分簡(jiǎn)便。

傳統(tǒng)的過(guò)程控制儀表系統(tǒng)每個(gè)現(xiàn)場(chǎng)裝置到控制室都需使用一對(duì)專(zhuān)用的電纜或雙絞線，以傳送4ma~20ma信號(hào)?，F(xiàn)場(chǎng)總線系統(tǒng)中，每個(gè)現(xiàn)場(chǎng)裝置到接線盒的雙絞線仍然可以使用，但是從現(xiàn)場(chǎng)接線盒到中央控制室僅用一根雙絞線完成數(shù)字通信。

通過(guò)采用現(xiàn)場(chǎng)總線控制系統(tǒng)，到底能節(jié)省多少電纜，編者就不作詳細(xì)的計(jì)算。

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acroloc af 15-40 vertical mill ge fanuc 11m cnc control operator panel keyboard

abu10a fanuc type a03b-0807-c001 i/o module no. n1577199502

a98l-0031-0026 fanuc battery fanuc battery 3v

a98l-0031-0025, a06b-6114-k504, a06b6114k504, a98l00310025, shs749 batteries

a66l-6001-0023#l150r0 fanuc optical fiber cable

a290-0501-x531 shaft coupler pulse coder to servo motor

a290_0501-v535 fanuc coupler

a16b-1200-0150/01a memory board

a16b-1200-0150/01a ge fanuc a16b12000150 /01a g267

a06b-6078-k001 fanuc fan unit

a03b-0819-c001 fanuc base unit abu10a horizontal type

a03b-0807-c002 fanuc base unit abu5a horizontal type

a03b-0801-c445 ge fanuc a03b0801c445 g-143

a03b-0801-c113 ge fanuc plc 64 point output module a03b0801c113 od64b

a03b-0801-c101 ge fanuc plc interface module a03b0801c101 if01a

a03b0801c012 fanuc i/o base unit a03b-0801-c012 e1

a03b-0801-c009 ge fanuc plc 10 slot rack a03b0801c009

a02b-0236-k813 fanuc mdi signal cable

a02b-0124-k820

a02b-0076-k002 fanuc pc cassette b a02b-0076-k002 a4k pc cassette mdl a. 241

a02b-0076-k001 ge fanuc pc cassette ao2b-0076-k001 n826

a02b-0076-k001 fanuc pc cassette b a02b-0076-k001 a02b0076k002 lmsi 64k pc casse

a02b-0072-k817

9 pcs. - fanuc # a97l-0118-00008#vao1b - nib

9 of ge fanuc ic630mdl325a 115vac input module 16 circuits

8 ft fanuc rs232 serial cable db9 female to db25 male, for cnc dnc.

7       ge fanuc 90/70 module labels 44a726758-005 44a726758-017 44a726758-010

60w 200ohm jrm nb jrmnb takisawa mac v4 with fanuc 6 control

6 ft fanuc rs232 serial cable db9 female to db25 male, for cnc dnc.

52pa8b2j --pushbutton,mom,red,extended,2pos

5       fanuc a05b-2051-k011 cable clamp

5 lot       fanuc daito sp410 1.0 amp robot fuse p type sp-410 034115

5 ft fanuc rs232 serial cable db9 female to db25 male, for cnc dnc.

4x ge fanuc assorted ic610mdl175b ic610mdl101a ic610mdl151b i/o module b218811

44c742174-007r03

44a730654-001r02 ge fanuc       in box plc hmi servo cable 44a730654001r02

4 iwaki rf 180 30 ohm j servo motor braking resistors robot fanuc daihen

4 ft fanuc rs232 serial cable db9 female to db25 male, for cnc dnc.

3 ft fanuc rs232 serial cable db9f to db25m cnc dnc for pc and laptop kit.

3 ft fanuc rs232 serial cable db9 female to db25 male, for cnc dnc.

3 fanuc karel system reference manuals marskams 00365ef operations manual

3 - fanuc fuse block holder, 1a, part # fhsc1f, 500v,       , warranty

2-ge fanuc ic655ccm500a ccm communication modules

25 ft fanuc fadal rs232 serial cable db9 female to db25 male, for cnc dnc

24vdc @ 4.5a power supply unit hk-11-24 nemic-lambda

2 nib fanuc a06b-6078-k800 bus bar a06b6078k800 bag of 2

2 ge fanuc input module ic693mdl645b 16pt pos/neg logic

2 ge fanuc ic693mdl741 90-30 output 16pt neg plc

2 fanuc karel gmf maintenance and troubleshooting manual s 100 parts manual s100

2 -       fanuc 5 amp glass tube fuses, a60l-0001-0260/5 r00, warranty

1pcs tank br-agcf2w br-agcf ge fanuc a98l-0031-001996 6v li-ion battery

1pcs for panasonic br-agcf2w br-agcf ge fanuc a98l-0031-001996 6v li-ion battery

1pcs 6di85a-060 6di85a060 fanuc a50l-0001-0178 fuji module