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   P0950BM FBM43 Foxboro I/A 三種總線的通訊協(xié)議是由各DCS生產(chǎn)廠家自行開發(fā)的，通訊協(xié)議是不揭穿的。

    P0950BM FBM43 Foxboro I/A DCS網(wǎng)絡(luò)的結(jié)構(gòu)方法大致是三種，分別是總線形、環(huán)形和星形。星形結(jié)構(gòu)一般只用于小系統(tǒng)。通訊協(xié)議有令牌廣播式，問詢式和存儲(chǔ)轉(zhuǎn)發(fā)式。問詢式協(xié)議的網(wǎng)絡(luò)要有交通指揮器。所有人機(jī)界面要向控制器央求數(shù)據(jù)時(shí)，必需通過交通指揮器，由交通指揮器來向控制器央求數(shù)據(jù)?？刂破鞑湃A發(fā)送信息給人機(jī)界面。如 HONEYWELL的TDC2000，F(xiàn)ISHER 的PROVOX，都有交通指揮器。在星形網(wǎng)絡(luò)中，人機(jī)界面(操作站)可以作為交通指揮器。它只能聯(lián)接一個(gè)人機(jī)界面的結(jié)點(diǎn)。把它作為操作站。網(wǎng)絡(luò)的覆蓋面也比較小。由一些回路控制器組成的系統(tǒng)一般都連成星形網(wǎng)絡(luò)。令牌廣播式由一個(gè)結(jié)點(diǎn)宣告一個(gè)令牌(令牌是特別的比特組，比特組內(nèi)無源地址和目的地址)，令牌沿環(huán)繞行。拿到這個(gè)令牌的結(jié)點(diǎn)就改動(dòng)令牌中一個(gè)特定位，將令牌變成一信息幀的幀開端定界符，加掛上構(gòu)成一幀所需求的其他字段以發(fā)送信息，網(wǎng)絡(luò)上的其它結(jié)點(diǎn)都在接收信息。當(dāng)本站檢測到幀的目的地址與本站地址相符時(shí)，就接收該信息幀。一同轉(zhuǎn)發(fā)該幀，直到該幀回到發(fā)送站，才把該幀開釋。再發(fā)送新令牌。這種協(xié)議的特點(diǎn)是持有令牌的結(jié)點(diǎn)才華發(fā)送信息。令牌廣播式協(xié)議的網(wǎng)絡(luò)中，可以聯(lián)接多個(gè)人機(jī)界面的結(jié)點(diǎn)。在網(wǎng)絡(luò)上的結(jié)點(diǎn)都是對(duì)等的。每一個(gè)結(jié)點(diǎn)都有時(shí)機(jī)發(fā)送信息。如美國 BAILEY的INFI9090是令牌廣播網(wǎng)。存儲(chǔ)轉(zhuǎn)發(fā)協(xié)議是一個(gè)結(jié)點(diǎn)宣告信息，傳給下一個(gè)，這個(gè)結(jié)點(diǎn)接到信息，必需先存下來，如果自己要，就可以接收下來，如果不需求，就把它轉(zhuǎn)宣告去。直至到需求這個(gè)信息的結(jié)點(diǎn)中止。然后信息再返回到源結(jié)點(diǎn)，才開釋這個(gè)信息。這種協(xié)議用于環(huán)形網(wǎng)絡(luò)中。這種環(huán)形網(wǎng)絡(luò)可以長達(dá)幾公里。如美國BAILEY的NETWORK90的廠區(qū)環(huán)路就是這樣的網(wǎng)絡(luò)。不管什么結(jié)構(gòu)方法的網(wǎng)絡(luò)，連到網(wǎng)絡(luò)上的結(jié)點(diǎn)的總數(shù)是有束縛的，至于什么樣的結(jié)點(diǎn)，有幾個(gè)，它是不受束縛的。

    P0950BM FBM43 Foxboro I/A 在DCS網(wǎng)絡(luò)中，數(shù)據(jù)傳輸是以信息幀的方法傳輸?shù)?。它是同步發(fā)送星息。半雙工發(fā)送。雙工發(fā)送的很少。每一幀信息都有信息頭，信息尾，信息幀中緊跟首旗的是地址，其中包括信號(hào)宣告的結(jié)點(diǎn)的源地址，如結(jié)點(diǎn)號(hào)、模件號(hào)、功能塊號(hào)以及接收信息的結(jié)點(diǎn)的目的地址，如結(jié)點(diǎn)號(hào)、模件號(hào)和功能塊地址。信息幀的中心是數(shù)據(jù)，再后邊是校驗(yàn)。校驗(yàn)多的是選用循環(huán)冗余校驗(yàn)。CRC碼是一種能的檢錯(cuò)和糾錯(cuò)碼。數(shù)據(jù)在傳輸過程中，可以是一幀，也可以是兩幀，如果是兩幀，頭幀是旗，第二幀才是數(shù)據(jù)。長的一幀信息可長達(dá)200多個(gè)字節(jié)。選用存儲(chǔ)轉(zhuǎn)發(fā)協(xié)議的網(wǎng)絡(luò)中，當(dāng)一個(gè)結(jié)點(diǎn)發(fā)生缺點(diǎn)時(shí)，把這個(gè)結(jié)點(diǎn)旁通，讓信息通過。

FOXBORO 2808-SABA-TSK-G MAGNETIC FLOWTUBE NEW!!! 

FOXBORO 2893-SBBB-PPG-G MAGNETIC FLOWTUBE PLATINUM NEW 

10" FOXBORO MAGNETIC FLOW METER - UNUSED

FOXBORO,8002-SCR-G,MAGNETIC FLOWTUBE,8000 SERIS

Foxboro 2808-SABA-TSA-G Magnetic 8" Flow Tube 

Foxboro Magnetic Flowtube 6" 9306A-SIBA-PBJ-GL

Foxboro Platinum Electrode Magnetic Liquid Flowtube

FOXBORO M/2800 MAGNETIC FLOW TUBE 2B03-SABA-TPA-G

Foxboro E96S-IA Magnetic Flow Transmitter E96SIA NEW

2" FOXBORO MAGNETIC FLOW METER - NIB

New Foxboro Magnetic Flowtube, model: 9301A-S1BA-PBJ-GL

Foxboro Magnetic Flow Transmitter w/9300A 8" Flowtube

Foxboro Magnetic Flowtube 2893-SBBB-PPA-G STA 1/2" 

Foxboro Magnetic Flowtube 2801-SABB-TSA-G STB 1"

Foxboro Magnetic Flowtube 2802-SABA-TSA-G STC 2"

Foxboro Magnetic Flowtube 1/2" 280H-SBBA-TTA-G STB

Foxboro Magnetic Flowtube 2803-SABA-TSA-G 3"

FOXBORO Magnetic Flow Tube M 2800 Series 2808-SABA-TSG

FOXBORO MAGNETIC FLOWTUBE 2800 SERIES

FOXBORO 9308A-SIBA-TPJ-GM 8" MAGNETIC FLOW TUBE ,NEW

6" Foxboro Series 8006 Teflon Lined Magnetic Flow Tube

NEW Foxboro Magnetic Flowtube 9300A Series 9304A-SIBA

New Foxboro Magnetic Flowtube 8003A-WPI-BJGCNZ

New Foxboro Magnetic Flowtube 8003A-WPR-BJGCNZ

FOXBORO 6" MAGNETIC FLOW METER TYPE 1806-SATS-BA

Foxboro Magnetic Flowtube 8001A-WPR-PJGCNZ

Foxboro Magnetic Flowtube 800HA-WPR-PJGCNZ 1/2"

Foxboro 2800 Series magnetic flow tube meter 1 1/2 pipe

FOXBORO 8308-SABB-TSJ-GFGZ MAGNETIC FLOWTUBE, NEW

FOXBORO 8000 SERIES MAGNETIC 6" FLOWTUBE 8006-WCR-A

FOXBORO MAGNETIC FLOWTUBE SERIES 8000 8003-WCR-A 3"

8000-PA15 FOXBORO 8000PA15 MAGNETIC FLOW TRANSMITTER 

FOXBORO 9300A Series Flange Magnetic Flowtube HASTELLOY

New Foxboro Magnetic Flowtube 8002A-WPR-TJGCNZ-A

Foxboro Magnetic Flowtube 9301A-SIBA-PPJ-GL 1"

NEW FOXBORO MAGNETIC FLOWTUBE 8002A-WPR-HJGCNZ-A

USED:Foxboro 8300 Series magnetic flow tube, model 831H

FOXBORO 2800 SERIES MAGNETIC FLOW TUBE

FOXBORO MAGNETIC FLOWTUBE 2800 SERIES

FOXBORO MODEL# 9300A MAGNETIC FLOWTUBE/TRANSMITTER UNIT

Foxboro Magnetic Flow Transmitter # E96P-1FNF-E

FOXBORO MAGNETIC FLOW TRANSMITTER 8000-SA10-G 4-20MA

FOXBORO 8002A-WPR-PJGFNA MAGNETIC FLOWTUBE 2" SER 8000A

FOXBORO MAGNETIC FLOW TRANSMITTER MODEL# 896-SA-K

FOXBORO 9300A Series Flange Magnetic Flowtube

Foxboro Magnetic Flowtube 8300 Series Cheap priced

Foxboro Magnetic Flowtube 2800 Series model 2802

Foxboro Magnetic Flowtube M/2800 Series model 280H-SBBA

Foxboro I/A Series Magnetic Flow Transmitter Mod IMT20

FOXBORO 2806SABATHAG 6" MAGNETIC FLOWTUBE, USED

FOXBORO IMT20 MAGNETIC FLOW TRANSMITTER I/A SERIES NEW

FOXBORO E96P-IA MAGNETIC FLOW TRANSMITTER E96P

Foxboro Magnetic Flowtube 800HA-WPR-PJGCNZ

NEW FOXBORO 47 MAGNETIC FLOW TRANSMITTER 47-AAA1A

FOXBORO IMT25 I/A Series MAGNETIC FLOW TRANSMITTER

Foxboro Magnetic Flow Transmitter IMT20-PA10FGZ refurb

Foxboro Magnetic Flow Transmitter IMT20-SA10FGZ-G reman

Foxboro Magnetic Flow Transmitter E965-IA

FOXBORO M/2800 SERIES NEW MAGNETIC FLOW TUBE

FOXBORO MAGNETIC FLOW TRANSMITTER E96T-IA-A

FOXBORO 9300A SERIES MAGNETIC FLOWTUBE MODEL# 9302A....

FOXBORO MAGNETIC FLOW TRANSMITTER MODEL# 896-SA-K

Foxboro M/2800 Magnetic Flowtube 2" NEW #6135LR

Foxboro Magnetic Flow Transmitter IMT25-PDADB40L-AB

Foxboro E96P-HFNF Magnetic Flow Transmitter New

FOXBORO MAGNETIC FLOWTUBE 8002A-WPR-HJGCNZ-A

Foxboro Magnetic Flow Transmitter IMT25-PDADB40L-B

FOXBORO MAGNETIC FLOW TRANSMITTER E96S-IA 15VA 120VAC

FOXBORO 2803 3" MAGNETIC FLOWTUBE(NO TAG), USED

USED FOXBORO MAGNETIC FLOW TRANSMITTER 8000 8000-PA10-G

USED FOXBORO MAGNETIC FLOW TRANSMITTER 8000 8000-PA10-G

NEW FOXBORO MAGNETIC FLOW TUBE 2891-SBBB-PHA-6 STYLE A

Foxboro Magnetic Flow Transmitter New ; *B8

FOXBORO IMT20PA10FGZ I/A MAGNETIC FLOW TRANSMITTER, NEW

FOXBORO IMT20-PA10FGZ MAGNETIC FLOW TRANSMITTER, NEW

FOXBORO MAGNETIC FLOW TRANSMITTER E96S-IA