描述
監(jiān)測心跳
一個(gè)外部看門狗須具備的最簡單功能是監(jiān)測由主應(yīng)用處理器產(chǎn)生的一個(gè)定期“心跳(Heart beat)”信號(hào),以及在心跳異常時(shí)發(fā)出一個(gè)錯(cuò)誤信號(hào)。心跳監(jiān)測可做為兩種不同的用途:首先,在經(jīng)過已在軟件執(zhí)行的功能檢查之后,微控制器(MCU)應(yīng)該只是生成心跳,以確保軟件的正常工作。第二,如果系統(tǒng)的實(shí)時(shí)響應(yīng)已受到損害,心跳應(yīng)該要能顯示出來。
為軟件功能和實(shí)時(shí)響應(yīng)監(jiān)測心跳,可透過一個(gè)使用簡單,“啞巴(Dumb)”的外部看門狗。外部看門狗應(yīng)該有沿著一個(gè)心跳必須出現(xiàn)的窗口的能力調(diào)派一個(gè)心跳周期,心跳窗口的作用是當(dāng)系統(tǒng)的實(shí)時(shí)響應(yīng)受到損害時(shí),允許看門狗進(jìn)行檢測。而在該功能或?qū)崟r(shí)檢查失敗的情況下,看門狗會(huì)試圖透過應(yīng)用處理器的重置來恢復(fù)系統(tǒng)。
主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
Square D FCL34100 Circuit Breaker 100 Amp 3 Pole New
Thermo Electron Corp 105ECA-115 Power Supply EC105 New
Yaskawa CIMR-VU4A0002JA?A Speed VFD Drive CIMRVU4A0002JA
GE AC0O1 44A719336G01 AC Output Driver 44A719336-G01
Gai-Tronics 701-902 Smart Handset/Speaker Amplifier New
Siemens 6ES7 131-4BD01-0AA0 Input Module Qty 5
Banner MSCD-2T3-69016 Mini-Screen Control Box New
Texas Instruments 500-2109 Base Controller 5002109 New
GE TED134150 Circuit Breaker 150AMP 3P 480 VAC 250 VDC
Sensormatic Ultralink CBC-4020 Alarm Management Unit
Edwards Adaptahorn 879DEX-G1 Horn 24VDC 879DEXG1 New
Toshiba VFA7-2075PL (8A) Inverter Drive VFA72075PL New
XP Power 101152-01 AC to DC Power Supply F8B6D4A3G3 New
Samsung BP94-02258F ASSY PCB Main HLS6767 L66 New
ABB 2600T 264D Safety Pressure Transmitter Kit New
Giddings & Lewis 502-02734-50 I/O Logic 5020273450
Fagor MKT-27 Linear Encoder MKT27 New
SORTIES NUM FC-200577/D OUTPUT CARD FC-200577D NIB
SANYO SAN DRIVER PDT-A12-20 PDT-A- 12F -20 New
TAIYO TNA1-IF50 AC SERVO NUTRUNNER SYSTEM New
Bosch Rexroth R900979888 VT-VRPA2-2-10/V?0/T5 Amp Card
Foxboro 873PH-AIXFGZ PH/ORP Analyzer 873PHAIXFGZ New
TAC MNB-1000-15 I/O Bacnet Module MNB100015 T.A.C. New
Honeywell VA301D2C0MB-NET?-0 Gaspoint2 Gas Transmitter
Signet Scientific MK584 Powered Flow Meter MK-584 New
AO Smith 9004618005 Ignition Control Board A.O. New
Reliance 0-56313-1 Process Controller 0563131 New
Astec MP8-2N-2R-1N-1W?-01 Power Supply 73-580-5015
Bosch Rexroth R900979885 VT-VRPA2-1-10/V?0/T5 Amp Card
Square D SY/MAX 8030 RIM101 X 16 Input Module New
BLH 5510 Transducer Amplifier Card New
Moore 50DP3116EBBXB Transmitter B/M M20498-002 KYNAR
Foxboro 823DP-I3S1NL2 Electronic Transmitter New
Krauss Maffei TE500 Control Board TE-500 5089390 New
Siemens PSX-12 Power Supply Extender 500-034120 New
LiftMaster LA400-CONT 24VDC Controller Lift Master New
Symbol PDT6100 PDT6146-Z7S63HU?S Barcode Scanner
Texas Instruments 500-5031 32 Output Module 5005031 New
Siemens HQJ23B150H Circuit Breaker 150A 3 Poles New
Fisher DH7201X1-A1 39A2990X092-13 Communication Card
Endress + Hauser 50066894 Flowtec Module 30 FM 50066553
Allen Bradley 808-G1 Zero Speed Switch 808G1
Reliance Electric 0-51831-1 CVTB Module 0518311 New
PTI Controls 50387 Modulator Logic Control Board
Giddings & Lewis 502-03428-10 Comm Board 5020342810
Allen Bradley 1771-M3 Servo Control Module 1771M3 Used
Siemens 3RK1300-0ES01-0?AA0 Profibus Starter EM 300 DS
Fanuc A16B-1600-0160 Power Supply A16B16000160 New
Aiphone AX-DV Vandal Resistant Video Door Station New
Endress + Hauser 50059318 Control Board 50070511 New
Marposs 8491410201 E49 Controller New
Honeywell 30731737-006 Analog Display 30731737006 New
Endress + Hauser 50038843 Control Board New
Ronan X87-400-HS Process Card X87400HS R22 77186 New
Schafer Elektronik GMBH C520-25 Power Supply C52025 New
Marposs 6316240300 A/D Converter New
Foxboro L0118VX-E Control Board Used
Foxboro L0113DB-C Control Board Used
Foxboro L0113DB-A Control Board Used
ABB 751010R0815 Control Board Power Supply New
Reliance Electric 0-49003 Pre Amplifier Cardpak 049003