1756-A17K產(chǎn)品說明：
1756-A17K
【1】DCS控制系統(tǒng)
【2】機器人系統(tǒng)
【3】PLC系統(tǒng)
【4】伺服數(shù)控系統(tǒng)
【服務(wù)說明】現(xiàn)貨配送至全國各地含稅含運費
【產(chǎn)品質(zhì)量】全新原裝正品 有發(fā)票
【產(chǎn)品優(yōu)勢】專業(yè)銷售 薄利多銷 信譽好，價格低，貨期短，服務(wù)周到
廈門卡庫電氣有限公司專業(yè)銷售大型進口各種品牌DCS系統(tǒng)模塊備件：
ABB Advant OCS，ABB MOD 30/MODCELL，ABB MOD 300，ABB Bailey INFI 90，
ABB Procontic，ABB Procontrol，
H&B Contronic，Moore APACS，Moore Panel Controllers，Rosemount RS-3，
Siemens Iskamatic，Siemens Simatic S5，Siemens Simatic C1，
Yokogawa Centum XL，Yokogawa microXL，
FOXBORO I/A，GE FANUC，
Honeywell QCS，Honeywell TDC系列，Honeywell S9000，
HITACHI，Mitsubishi PLC，Motorola MVME，ALSOM MVME,Other VME,TOSHIBA等大型模組，
備注～歐美進口備件，各品牌停產(chǎn)老備件，我們價格甚優(yōu)！
所詢價格若有別家公司報更低價格，只要您提供公司名稱，我們可以給您進一步的折扣…
離心鼓風(fēng)機配套電自控系統(tǒng)中，系統(tǒng)配置如下：就地安置的低壓電控柜六套，用來完成各自風(fēng)機子系統(tǒng)的啟停等功能；PLC遠地自控機柜一套，選用S7-300系列，采集整個風(fēng)機系統(tǒng)的溫度、流量、油壓等模擬量后通過上位機輸出顯示、報警。風(fēng)機系統(tǒng)的溫度采集點有很多，本項目中每套風(fēng)機各有3個電機定子溫度、2個電機支撐軸承的溫度、風(fēng)機的2個支撐軸承的溫度和1個止推軸承的溫度，溫度點共計48個。若選擇西門子8點模擬量輸入模塊，則共需要6塊。（如圖1）再加上軸震動度、油管壓力、出口風(fēng)壓等模擬量輸入，需要選用的PLC的模擬量輸入模塊的數(shù)量太多，成本高、安裝難。那么，如何在保證甚至提高系統(tǒng)性能的前提下盡可能的減少擴展模塊呢？ 提出新思路 S7-300系列PLC的部分CPU配備了PROFIBUS DP主站/從站接口，所以我們可以利用PROFIBUS總線傳輸協(xié)議來批量的獲取現(xiàn)場溫度信號。PROFIBUS –DP用于現(xiàn)場層的高速數(shù)據(jù)傳送。主站周期地讀取從站的輸入信息并周期地向從站發(fā)送輸出信息?？偩€循環(huán)時間必須要比主站（PLC）程序循環(huán)時間短。除周期性用戶數(shù)據(jù)傳輸外，PROFIBUS-DP還提供智能化設(shè)備所需的非周期性通信以進行組態(tài)．診斷和報警處理。 我們知道，溫度信號可以通過巡檢的方式集中采集，所以根據(jù)實際情況，我選擇陜西工業(yè)自動化工程公司研制生產(chǎn)的SS7-16型16路溫度巡檢儀共3臺。但這種型號的溫度巡檢儀采用Modbus RTU協(xié)議（RS485口）進行通信，Modbus 協(xié)議是應(yīng)用于電子控制器上的一種通用語言。通過此協(xié)議，控制器相互之間、控制器經(jīng)由網(wǎng)絡(luò)（例如以太網(wǎng)）和其它設(shè)備之間可以通信。
主—從傳輸形式采集溫度信號結(jié)構(gòu)示意圖[/align] 兩示意圖分別是使用模擬量擴展模塊和溫度巡檢儀采集溫度信號的示意圖，直觀的比較兩圖不難發(fā)現(xiàn)，主—從站的結(jié)構(gòu)形式具有以下優(yōu)勢： 1、節(jié)省硬件數(shù)量與投資。 2、節(jié)省安裝費用。 3、節(jié)省維護開銷。 4、用戶具有高度的系統(tǒng)集成主動權(quán)。 5、提高了系統(tǒng)的準確性與可靠性。 既然這種思路有很大的優(yōu)勢，那么我們就可以拋棄模擬量輸入模塊，用溫度巡檢儀取而代之，下面我們對其更深入的進行分析。 ．列出兩種方案 針對兩種設(shè)備采用兩種協(xié)議的情況，下位機需要增加一個設(shè)備來完成Modbus RTU協(xié)議轉(zhuǎn)POFIBUS協(xié)議的工作。雖然改變了選型思路給我們帶來了新問題，但工控市場上琳瑯滿目的產(chǎn)品能幫我們輕松的解決。針對Modbus RTU協(xié)議轉(zhuǎn)POFIBUS協(xié)議的問題，容易想到兩種方案。 方案一：利用CP341通信模塊。 CP341模塊是S7—3001400系列PLC中的串行通訊模塊。該模塊具有1個可選的串行通訊口（本項目選為RS485口）CP341模塊可以同時與多臺串行通訊設(shè)備進行通訊，如同時連接多個變頻器、巡檢儀等。其處理器可以特別方便和簡單地進行參數(shù)化。如果采用RS422／485 Modbus RTU通訊方式，需要在發(fā)送的數(shù)據(jù)包中包括站號、數(shù)據(jù)區(qū)、讀寫指令等信息。供CP341模塊所連接的從站設(shè)備鑒別數(shù)據(jù)包是發(fā)給哪個站。
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PACIFIC SCIENTIFIC R67HENA-R2-NS-NV-00 SERVO MOTOR 27.6A 168LB-IN
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THERMO SCIENTIFIC TE-103131-00 82I MEASUREMENT INTERFACE REV D
THERMO SCIENTIFIC TE-103131-00 82I MEASUREMENT INTERFACE REV D04
