描述
监测心跳
一个外部看门狗须具备的最简单功能是监测由主应用处理器产生的一个定期“心跳(Heart beat)”信号,以及在心跳异常时发出一个错误信号。心跳监测可做为两种不同的用途:首先,在经过已在软件执行的功能检查之后,微控制器(MCU)应该只是生成心跳,以确保软件的正常工作。第二,如果系统的实时响应已受到损害,心跳应该要能显示出来。
为软件功能和实时响应监测心跳,可透过一个使用简单,“哑巴(Dumb)”的外部看门狗。外部看门狗应该有沿着一个心跳必须出现的窗口的能力调派一个心跳周期,心跳窗口的作用是当系统的实时响应受到损害时,允许看门狗进行检测。而在该功能或实时检查失败的情况下,看门狗会试图透过应用处理器的重置来恢复系统。
主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):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-VU4A0002JAA 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/V0/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/V0/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-Z7S63HUS 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 3RK1300-0ES01-0AA0 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