AB 1761-L32BWA
咨詢熱線18050036945
主營業(yè)務(wù):AB,ABB,GE,本特利,??怂共_,英維斯,西屋,艾默生,橫河
PLC有很強(qiáng)的自診斷功能,PLC每掃描一次執(zhí)行一次自診斷檢查,確定PLC自身的動(dòng)作是否正常,如電源檢測、內(nèi)部硬件是否正常、程序語法是否有錯(cuò)等。如檢查出異常時(shí),CPU面板的LED及異常繼電器會(huì)接通,在特殊寄存器中會(huì)存入出錯(cuò)代碼;CPU能根據(jù)錯(cuò)誤類型和程度發(fā)出信號,甚至進(jìn)行相應(yīng)的出錯(cuò)處理,使PLC停止掃描或強(qiáng)制變成STOP狀態(tài)。
PLC運(yùn)行正常時(shí),掃描周期的長短與用戶應(yīng)用程序的長短、CPU的運(yùn)算速度、I/O點(diǎn)的情況等有關(guān)。通常用PLC執(zhí)行1KB指令所需時(shí)間來說明其掃描速度(一般1-10ms/KB)。值得注意的是,不同指令執(zhí)行時(shí)間是不同的,故選用不同指令所用的掃描時(shí)間將會(huì)不同。若用于高速系統(tǒng)要縮短掃描周期時(shí),可從軟硬件上同時(shí)考慮。PLC周期性循環(huán)掃描工作方式的顯著特點(diǎn)是:可靠性高、抗干擾能力強(qiáng),但響應(yīng)滯后、速度慢。
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廈門莫格電氣自動(dòng)化有限公司
聯(lián)系人:劉水仙(銷售工程師)
手 機(jī):18050036945/0592-6808374
Q Q:3443643092
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EATON-CUTLER HAMMER E51DF3 GLASS FIBER OPTIC SENSOR HEAD, NIB
BANNER FIBER OPTIC ASSEMBLY 21109 BTHA23S
GUARDMASTER ROTACAM SAFETY SWITCH HS-1
CUTLER-HAMMER 400-1600A, CURRENT SENSOR DB-50 8184A38H01 *NEW SEALED*
FOXBORO 1MV/AMP FLOWTUBE SIMULATOR IMT96SIM ST-A
PERCEPTRON DIGITAL SURFACE SENSOR S0600-X0108-Y01?47-Z0310 / 917-1012
BALLUFF 10-30VDC INDUCTIVE PROXIMITY SWITCH 1202D-3
BAUMER ELECTRIC IFFM 08P1595/01S35L
TYPE J 4.5" LONG TEMPATURE PROBE 08517-55
PEPPERL+FUCHS PROXIMITY SENSOR 905495 / NMB2-12GM40-Z0-?C-FE-300MM-V1
BANNER SMBPVD225AB PROTECTIVE BRACKET, NEW
COGNEX IN SIGHT VISION SENSOR 800-5870-1 NIB
CUTLER-HAMMER E57EAL5T111SN MINIATURE SHORT BODY INDUCTIVE PROXIMITY SENSOR, NNB
HONEYWELL / MICRO SWITCH 10-30VDC PROXIMITY SENSOR 982FS0.8-A3P-L
IFM ELECTRONIC PHOTOELECTRIC SENSOR OG5061 OGPLFPKG/V4A/US
NAMCO 10-30VAC 4-PIN PROXIMITY SWITCH ET311-33151
ISSC 1250-1-A-1 PROXIMITY SENSOR NIB
HONEYWELL PRECISION LIMIT SWITCH 2LS111
MIDDEX-ELECTRON?ICS 4-PIN SENSOR, D-78582
OMRON LIGHT CURTAIN W/ CABLE AND MOUNTING BRACKETS F3S-A162P-L
PEPPERL+FUCHS PHOTOELECTRIC SENSORS MV3/59/115/149 NIB
HAMLIN MAGNETIC SENSOR 10W 120VAC 0.5A 59135-010
THERMO WEB SYSTEMS INC. THERMOSTAR W/ CASE AND SENSOR
BANNER MINI-BEAM PHOTOELECTRIC SENSOR SM312CVQD
FOXBORO 8" MAGNETIC FLOW TRANSMITTER TYPE 2808-SABA-TS
FOXBORO M/2800 SERIES MAGNETIC FLOWTUBE 2804-SABB-TSG-G ST. C