1756-IA8D-CC永州種類多
在客戶端/服務(wù)器架構(gòu)下,客戶端要做的件事是實(shí)現(xiàn)與服務(wù)器的連接??蛻舳送ㄟ^(guò)一個(gè)連接地址(在此我們略過(guò)一些細(xì)節(jié)),將創(chuàng)建一個(gè)與服務(wù)器的會(huì)話通道。該會(huì)話包含一個(gè)安全的報(bào)文,其中包括可選擇的加密和身份驗(yàn)證等參數(shù)——用于識(shí)別服務(wù)器中的客戶端應(yīng)用程序和用戶是否匹配。客戶端還可以識(shí)別服務(wù)器,并決定是否允許與該服務(wù)器通信。
會(huì)話建立之后,客戶端應(yīng)用程序可以從服務(wù)器請(qǐng)求一些標(biāo)準(zhǔn)服務(wù)。這些服務(wù)包括:
1. 連接并創(chuàng)建會(huì)話
2. 瀏覽地址空間——查找服務(wù)器上可用的內(nèi)容
3. 讀取-變量值或原始數(shù)據(jù)
4. 寫(xiě)入-變量值或原始數(shù)據(jù)
5. 調(diào)用方法
6. 閱讀歷史信息-變量和事件
7. 關(guān)閉會(huì)話并斷開(kāi)連接
所以最后,當(dāng)客戶端完成需求時(shí),它將關(guān)閉會(huì)話并斷開(kāi)連接。
02
客戶端/服務(wù)器訂閱
客戶端/服務(wù)器模型內(nèi)還包含一個(gè)訂閱模型。在這個(gè)模型中,每個(gè)客戶端可以創(chuàng)建任意數(shù)量的服務(wù)器訂閱(在此的訂閱為訂閱功能)。每個(gè)訂閱都可以包括變量、EventNotifier的MonitoredItems(具有EventNotifier屬性集的對(duì)象節(jié)點(diǎn))。
Simrad GC80/85 Compact Control Unit I-type 27101690 NEW
Honeywell 51405043-175 Digital Output 24v module NEW
Agilent G1978-60027 Charging Electrode Mount Assy NEW
VersaCAT TEST SYSTEM 3M Austin Metrology LAB USED
Brocade BR-TWS3-R250W Wide Area File Services Appliance
ASE2000-COM Communication Test Set by Applied Systems
Honeywell 51304672-150 Analog Output Spare forTDC 3000
Agilent G1315-60015 Micro High-Pressure Flow Cell NEW
Thrane & Thrane Sailor RT5022 VHF DSC NEW
SEL-387 Current Differential & Overcurrent Relay 110VDC
STUDER Distribution Box A943.045500 NEW
Alcatel 3BA23197BA CPU6 Board 40G 128M New
Alcatel 3AL78830AE card for 1660 1662SMC etc New
Alcatel 3AL98023AA ENHANCED SERGI for 1662SMC etc New
NeoScale CryptoStor Tape 700 SC702R NEW
NEW Callenberg SYMAP ECG ENGINE CONTROL GENERATOR
USSI Board N451910-5102 LM1601-9R LM3020-9 Ansaldo
New USSI Auxiliary Board PN: N12360401 Ansaldo
SIEMENS SIMODRIVE 6SN1123-1AB00-0BA1 6SN1118-1NH01-0AA0
Lot 3000 AA264-87LF SKYWORKS Chips Digital Attenuator
JAMES H. HEAL EB640PRJH light fastness tester Power
Agilent G1946-65251 Tstd Octopole 2 Pca New
IR Ingersoll Rand ARO 662420-B PISTON PUMP ASM NEW
PELCO SD418-F1-X Indoor Colour/Monochrome Camera New
PELCO SD418-PGE1-X Pendant Mount Day/Night Outdoor PTZ
Agilent 79846-66501 ICO INJECTOR BOARD AY New in box
Anspach xMax Arthroscopy Drill Refurbished
NORTEL UPPER COOLING UNIT Assembly NTHR52AB new spare
Bluecoat SG800-3 ProxySG800 080-03102 NEW
Bluecoat SG800-3 ProxySG800 080-02673 NEW
Lot 1500 RICOH PC card controller R5C554-CSP277 $0.8/pc
TOYOPUC PC3JP TIC-6215 TOYODA Machine
TOYOPUC PC3JG-P TIC-6088 1.90 CPU Module TOYODA Machine
IRIS Model P522 P522AC Flame Monitor Signal Processor
Advantech TPC-1270H-C1E HMI 12.1 Touch Screen Computer
SSB DAPF-WHI010-0410 Motor New
Used Thrane & Thrane TT-3022D 403022D & TT-3005M Antena
SHIMADEN PAC 36 PAC36P415 THYRISTOR Power Regulator new
ECS O.P.TFT 12.1 LCD CNC 1800 080H819 USED Spare part
廈門(mén)億佳天辰貿(mào)易有限公司專注于西門(mén)子施耐德等