1771-IDK
1771-IDK
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每走一步,首先想到的是客戶
尊重客戶,理解客戶,持續(xù)提供超越客戶期望的產(chǎn)品與服務(wù),做客戶們永遠(yuǎn)的伙伴。
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&公司全稱:廈門泰尼電氣有限公司
&業(yè)務(wù):黃東梅《女士》
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PLC的掃描工作過程:
1、輸入采樣階段
在這一階段中,PLC以掃描方式讀入所有輸入端子上的輸入信號(hào),并將各輸入狀態(tài)存入對(duì)應(yīng)的輸入映像寄存器中。此時(shí),輸入映像寄存器被刷斷。在程序執(zhí)行階段和輸出刷新階段中,輸入映像存儲(chǔ)器與外界隔離,其內(nèi)容保持不變,直至下一個(gè)掃描周期的輸入掃描階段,才被重新讀入的輸入信號(hào)刷新。可見,PLC在執(zhí)行程序和處理數(shù)據(jù)時(shí),不直接使用現(xiàn)場(chǎng)當(dāng)時(shí)的輸入信號(hào),而使用本次采樣時(shí)輸入到映像區(qū)中的數(shù)據(jù)。一般來說,輸入信號(hào)的寬度要大于一個(gè)掃描周期,否則可能造成信號(hào)的丟失。
2、程序執(zhí)行階段
在執(zhí)行用戶程序過程中,PLC按照梯形圖程序掃描原則,一般來說,PLC按從左至右、從上到下的步驟逐個(gè)執(zhí)行程序。但遇到程序跳轉(zhuǎn)指令,則根據(jù)跳轉(zhuǎn)條件是否滿足來決定程序跳轉(zhuǎn)地址。程序執(zhí)行過程中,當(dāng)指令中涉及輸入、輸出狀態(tài)時(shí),PLC就從輸入映像寄存器中“讀入”對(duì)應(yīng)輸入端子狀態(tài),從輸出映像寄存器“讀入”對(duì)應(yīng)元件(“軟繼電器”)的當(dāng)前狀態(tài)。然后進(jìn)行相應(yīng)的運(yùn)算,運(yùn)算結(jié)果再存入輸出映像寄存器中。對(duì)輸出映像寄存器來說,每一個(gè)元件(“軟繼電器”)的狀態(tài)會(huì)隨著程序執(zhí)行過程而變化。
3、輸出刷新階段
程序執(zhí)行階段的運(yùn)算結(jié)果被存入輸出映像區(qū),而不送到輸出端口上。在輸出刷新階段,PLC將輸出映像區(qū)中的輸出變量送入輸出鎖存器,然后由鎖存器通過輸出模塊產(chǎn)生本周期的控制輸出。如果內(nèi)部輸出繼電器的狀態(tài)為“1”,則輸出繼電器觸點(diǎn)閉合,經(jīng)過輸出端子驅(qū)動(dòng)外部負(fù)載。全部輸出設(shè)備的狀態(tài)要保持一個(gè)掃描周期。
CONTINENTAL FQV356 600A 600V FUSIBLE PANELBOARD SWITCH
MTE Matrix Filter MDG0403D 3Phase 480Volt 403Amp
MERLIN GERIN 47059 / S164A MICROLOGIC 6.0P TRIP UNIT IN BOX
Square D I-Line II Aluminum Plug-In Busway 4000 Amp 600 Volt AP2340G10 - Referb
Cutler-Hammer Circuit Breaker DSII-608 - 800A Frame w/ Digitrip RMS 510 W/ LSIG
Kohler Automatic Transfer Switch, 600 Amp, 480 Volt, 4 Wire, Part # K-566341-600
Allen Bradley 2100 Series Size4 FVNR Starter MCC Bucket
ITE/Gould XL-X Bus Duct Fusible Switch Plug - RV465G - 400A, 600V, 4W w/ GND
ASCO Automatic Transfer Switch 600A 480Y/277V C940360099XC
Cutler Hammer NB TriPac Trip Unit - NB3800PT - 3 Pole, 800 Amp - In Box
Cutler Hammer ELHKD3300 Circuit Breaker w/ ELD343 Ground Fault Protection -
Westinghouse NB TriPac Trip Unit - NB3600PT - 3 Pole, 600 Amp - In Box
ITE SIEMENS BULLDOG BOS16424 200A 240V 4W FUSE BUSPLUG
GE AKR-6D-30 800 Amp 635 Volt Air Breaker w/ MVT LSIG
Merlin Gerin Compact CK800HH 800Amp 600V W/ 800Amp STR25DP Trip W/ LI
Crouse-Hinds KAM-LOK 1200Amp 480Volt Bolted Pressure Contact Switch w/Shunt Trip
Crouse-Hinds KAM-LOK 1200Amp 240Volt Bolted Pressure Contact Switch w/Shunt Trip
Dodge Torque-Arm Speed Reducer - Size TXT725T / Part # 247161 QU -
Kearney VacPac Load Interrupter Vaccum Switch 15.5 KV 21VP95-22 w/ 15.5 KV Fuses
SQ D FC2IMA24C TVSS 240KA 208/120V SURGE SUPPRESSOR
W/ I-LINE BREAKER DISCONNECT (FC34060TVSS)
Chloride Power Protection System E101XA with (2) BPE101-02 Battery Cabinets
ASCO 7000 Series Automatic Transfer Switch w/ Bypass Isolation 400A 208V 3PH
QA0833CBC Pringle Switch Red Back E-OK
Pringle Switch 1200A "Old-Style" w/ Black Box E-OK
QA1233ET Pringle Switch Black Insulator E-OK
CBC1233B Pringle Bolted Pressure Switch E-OK
QA0833 Pringle Switch E-OK
QA0833B Pringle Bolted Pressure Switch E-OK
QA1233 Pringle Switch (Black) E-OK
QA1233B Pringle switch (red) EOK
THPC3412 GE HPC Switch E-OK
THPR3612 GE HPC Switch E-OK
THPC3412B GE HPC Switch E-OK
VL368 Black Boltswitch E-OK
VLB349 Boltswitch Switch E-OK
VLB348 Boltswitch Switch E-Ok
VL368 Boltswitch Switch E-OK
VL368-ST Boltswitch Switch E-OK
BLO32160 Black Back Plate Square D Switch E-OK
BPO3612 Square D Switch Red Back E-OK
BLO32120 Black back Square D Switch E-OK
BLO32120T Black Back Square D Switch E-OK
BPO3612 Red Back Plate Square D Switch E-OK
BLO34120 Square D Switch ( Red) E-OK
BLO-37160 UPS Red Back Base Square D Switch E-OK
BLO32160 Red Insulator Square D Switch E-OK
BL-36160-0 Square D Load Break Switch Black Back E-OK
BLO34120 Black Back Plate Square D Switch E-OK
BLO34120 Black Back Plate with Red Arc Shield Square D Switch E-OK
GE Spectra Fusible Panelboard Switch - ADS36600HB - 600A, 600VAC, 3 Phase
THPR3608G3T GE HPC Switch Surplus
Allen Bradley PowerFlex70 30HP Drive - 20AD040A3AYNANCO - 480VAC Input -
SIEMENS LMD63F800 SURPLUS IN BOX
GE ADS36600HM 600A 600V 3PH FUSIBLE PANEL BOARD SWITCH
GE AK-3A-50 1600 Amp 600 Volt Air Breaker w/ Power Sensor LSIG