詳細內(nèi)容：140CPU11303 對于用戶來說，在編寫用戶程序或選擇設(shè)備時，必須清楚下面介紹的三個階段，即用戶程序執(zhí)行過程的原理。 PLC采用集中處理的方法，即對輸入掃描信號、執(zhí)行用戶程序和輸出刷新都采用集中分批處理的工作方式。 輸入掃描 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，并將輸入信號存入輸入映像區(qū)，輸入映像存儲器被刷新。在程序執(zhí)行階段和輸出刷新階段中，輸入映像存儲器與外界隔離，其內(nèi)容保持不變，直至下一個掃描周期的輸入掃描階段，才被重新讀入的輸入信號刷新�？梢姡琍LC在執(zhí)行程序和處理數(shù)據(jù)時，不直接使用現(xiàn)場當(dāng)時的輸入信號，而使用本次采樣時輸入到映像區(qū)中的數(shù)據(jù)。如果輸入設(shè)備能使PLC輸入端形成閉合回路，對應(yīng)輸入端編號的內(nèi)部輸入繼電器內(nèi)保存為“1”，即相當(dāng)于繼電器線圈導(dǎo)通。在程序執(zhí)行過程中，該編號對應(yīng)的觸點動作；如果輸入設(shè)備能使輸入開路，則對應(yīng)輸入端編號的內(nèi)部輸入繼電器內(nèi)保存為“0”，即相當(dāng)于繼電器線圈沒導(dǎo)通，在程序執(zhí)行過程中，該編號對應(yīng)的觸點不動作。如果在PLC處于非輸入掃描的階段，PLC外的輸入設(shè)備狀態(tài)發(fā)生了變化，內(nèi)部輸入繼電器也不會發(fā)生變化，要等到下一個輸入掃描階段才能根據(jù)此時的輸入狀態(tài)來刷新。所以，對于少于十幾毫秒的輸入信號，經(jīng)常采集不到。 執(zhí)行程序 在執(zhí)行用戶程序過程中，PLC按梯形圖程序順序自上而下、從左至右逐個掃描執(zhí)行，即按助記符指令表的先后順序執(zhí)行。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，PLC從輸入映像區(qū)中取出輸入變量的當(dāng)前狀態(tài)，然后進行由程序確定的邏輯運算或其他運算，根據(jù)程序指令將運算結(jié)果存入相應(yīng)的內(nèi)部繼電器中，包括輸出繼電器、內(nèi)部輔助繼電器、定時器、計數(shù)器等。輸出繼電器的信號存放在輸出映像區(qū)，即輸出繼電器與PLC外部的同編號的輸出點對應(yīng)。 在程序執(zhí)行過程中，同一周期內(nèi)，前面的邏輯結(jié)果影響后面的觸點，即后執(zhí)行的程序可能用到前面的最新中間運算結(jié)果；但同一周期內(nèi)，后面的運算結(jié)果不影響前面的邏輯關(guān)系。該掃描周期內(nèi)除輸入繼電器以外的所有內(nèi)部繼電器的最終狀態(tài)（導(dǎo)通與否），將影響下一個掃描周期各觸點的開與閉。 （3）輸出刷新 程序執(zhí)行階段的運算結(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”，則輸出繼電器觸點閉合。全部輸出設(shè)備的 。 Reliance Electric 3EB1 Encoder Isolation Buffer RELIANCE ELECTRIC 391023 CONTROL BOARD * IN A BOX* RELIANCE ELECTRIC 36HQ100-2-11/16 36HQ10021116 Reliance Electric 34C063-5422G7 C56H1590 115/208-230 1725rph .50hp 60hz 1PH RELIANCE ELECTRIC 3418-2WY 34182WY RELIANCE ELECTRIC 3418-2WN 34182WN RELIANCE ELECTRIC 333236 333236 RELIANCE ELECTRIC 32408 32408 RELIANCE ELECTRIC 3141-WX 3141WX RELIANCE ELECTRIC 3141-U 3141U RELIANCE ELECTRIC 3141-SB 3141SB RELIANCE ELECTRIC 3141-PL BOX OF 8 RELIANCE ELECTRIC 3141-PJ BRUSH (LOT OF 4 IN BOX ) RELIANCE ELECTRIC 3141-NQ 3141NQ RELIANCE ELECTRIC 3141-N 3141N RELIANCE ELECTRIC 3141-LM 3141LM Reliance Electric 3141-GW 3141GW Motor Brush - No Box Reliance Electric 3/4HP 208-230/460VAC 3-Phase Motor P56H7313GA Reliance Electric 3/4HP 208-230/460VAC 3-Phase Motor P56H7313GA RELIANCE ELECTRIC 3/4 HP MOTOR 1725 RPM *NEEDS SHANK* Reliance Electric 3/4 HP 3PH 56C Motor w/Morse 18GEDC 15:1 Speed Reducer Gearbox RELIANCE ELECTRIC 3/4 H.P. MOTOR P56X0357V , 1140 RPM , 208-230/460V , FR. FC56C RELIANCE ELECTRIC 2GU41001 DRIVE 1HP 460VAC 3PHASE 2.1 MAX AMP ***GOOD*** RELIANCE ELECTRIC 2GU41001 AC VS DRIVE GP-2000 460V 2.5A 50/60HZ 3PH ***XLNT*** RELIANCE ELECTRIC 2CA3001 2CA3001 RELIANCE ELECTRIC 2CA3001 ADAPTOR CABLE * IN A BOX* RELIANCE ELECTRIC 25CC1 PC BOARD 108053-071X 415710-13A RELIANCE ELECTRIC 2517-7/8 251778 RELIANCE ELECTRIC 251320PKPK7JCL 251320PKPK7JCL RELIANCE ELECTRIC 24V, FAN ASSEMBLY 615196-2R * * RELIANCE ELECTRIC 23C19 23C19 RELIANCE ELECTRIC 2356197A 2356197A RELIANCE ELECTRIC 230/460V 2.8/1.4A 1725RPM P56X1531H RELIANCE ELECTRIC 211L9 #18667 COIL RELIANCE ELECTRIC 208-230/460V 1/4HP 1140RPM DUTY MASTER AC MOTOR P48H0310P RELIANCE ELECTRIC 2006K-7A 2006K7A RELIANCE ELECTRIC 2 POLE CIRCUIT BREAKER, 705385-62T RELIANCE ELECTRIC 1LS2004 1LS2004 Reliance Electric 1Hp(+-) DC Motor ID# V76Q1523M-PG, 1725 rpm, relay,starter RELIANCE ELECTRIC 1C12000DA A-C V-S DRIVE OLD STOCK RELIANCE ELECTRIC 1AC2102U 2.9 kva 2hp 200/230v 15.5a 1ph 9.2a 3ph AC VS DRIVE RELIANCE ELECTRIC 1750RPM SIZE RATIO 56/150-5 TIGEAR RELIALUBE REDUCER 7916110BW RELIANCE ELECTRIC 1725RPM 1/4HP POWER MATCHED DC MOTOR T56H1019AB-SH / E80056C Reliance Electric 16 Slot Rack, 57C331, , WARRANTY RELIANCE ELECTRIC 15CC2 15CC2 RELIANCE ELECTRIC 15A 12V 24 HOUR PROGRAMMABLE TIME SWITCH 202 NNB RELIANCE ELECTRIC 15750-592 15750592 RELIANCE ELECTRIC 15750-588 15750588 RELIANCE ELECTRIC 15750-586 15750586 RELIANCE ELECTRIC 14C-620 14C620 RELIANCE ELECTRIC 14C-620 14C620 RELIANCE ELECTRIC 14C-277 14C277 RELIANCE ELECTRIC 14C-241 14C241 RELIANCE ELECTRIC 14C229 RELIANCE ELECTRIC 14C-228 14C228 RELIANCE ELECTRIC 14C-226 14C226 RELIANCE ELECTRIC 14C223 VOLTAGE/TACHOMETER FOLLOWER KIT, NIB RELIANCE ELECTRIC 14C-223 14C223 RELIANCE ELECTRIC 14C-223 14C223 RELIANCE ELECTRIC 14C223 VS DRIVES VOLTAGE/TACH FOLLOWER KIT 14C223 RELIANCE ELECTRIC 14C223 RELIANCE ELECTRIC 14C-222 14C222 Reliance Electric 14C-222 Interface Kit ! ! Reliance Electric 14C220 PC Board Adapter Kit ! ! Reliance Electric 14C-216 Dynamic Braking Kit 1/2-1.5 ! ! RELIANCE ELECTRIC 14C-212 14C212 RELIANCE ELECTRIC 14C212 2 POLE CIRCUIT BREAKER RELIANCE ELECTRIC 14C211 2 POLE CIRCUIT BREAKER RELIANCE ELECTRIC 14C21 MINIPAK PLUS 1.5 HP, 230 VAC ( ) RELIANCE ELECTRIC 14C201 Operator Control Station RELIANCE ELECTRIC 14C200 BLANK COVER PLATE * IN BOX* Reliance Electric 14C106, FlexPak Plus DC Drive, 115VAC, 1PH, 10.5A, 0.75HP RELIANCE ELECTRIC 1-48674-B VOLTAGE SENSITIVE RELAY MODULE 148674B RELIANCE ELECTRIC 129P06 129P06 RELIANCE ELECTRIC 129P06 129P06 RELIANCE ELECTRIC 1297500 1297500 Reliance Electric 128K Common Memory 57C423 (F6) Reliance Electric 1-2 HP 1725 RPM 208-230/460VAC 56C Frame Duty Master Motor RELIANCE ELECTRIC 115V-AC NUMERIC DISPLAY D469159 RELIANCE ELECTRIC 115VAC HIGH OUTPUT MODULE 0-57403-F *REFURBISHED* Reliance Electric 115V AC/DC Low Output Module, 57C402, , WARRANTY RELIANCE ELECTRIC 115V AC/DC L/O DIGITAL CONTROL SYSTEM CARD 57402-C RELIANCE ELECTRIC 115V AC INPUT COUPLING 57456-1 RELIANCE ELECTRIC 115 V AC OUTPUT MODULE 0-57403-E 0 57403 E 57403-E 57403E RELIANCE ELECTRIC 112151 112151 RELIANCE ELECTRIC 108-230/460V .5HP 1725RPM AC MOTOR P56H5069 RELIANCE ELECTRIC 108073-003T 108073003T RELIANCE ELECTRIC 107072-009W 107072009W RELIANCE ELECTRIC 1/4 HP AC MOTOR, 1725 RPM, 208-230/460-480 VOLT, 3 PHASE( ) RELIANCE ELECTRIC 1/3HP AC MOTOR #P48H2301P 230/460VAC 60HZ. 1725RPM Reliance Electric 1/2HP FB56C 208-230/460v 3PH 1725 RPM RELIANCE ELECTRIC 1/2HP DUTY MASTER AC MOTOR P56H1020S RELIANCE ELECTRIC 1/2HP AC MOTOR # 208-230/460VAC 60HZ. 1725 RPM RELIANCE ELECTRIC 1.5HP MOTOR /HUB CITY GEAR MOTOR FR56C PH:3 #518230 RELIANCE ELECTRIC 1.5 HP S2000 DUTY MASTER AC MOTOR , RPM 1730, FR FC145T, RELIANCE ELECTRIC 096066 096066 RELIANCE ELECTRIC 096066 096066 RELIANCE ELECTRIC 07901938AY 07901938AY Reliance Electric 078089006R DV/DT Resistor Assembly 0-78089-006R RELIANCE ELECTRIC 0-750 RPM ELECTRIC SPEED INDICATOR 412723-31D RELIANCE ELECTRIC 0-66042-55R 06604255R RELIANCE ELECTRIC 0-60066 060066 RELIANCE ELECTRIC 0-60035 060035 RELIANCE ELECTRIC 0-600 DC VOLTS VOLTAGE METER PANEL 612234-1RJ RELIANCE ELECTRIC 0-600 B.P.M ELECTRIC SPEED INDICATOR 63282 RELIANCE ELECTRIC 0-58710-1 0587101 Reliance Electric 0-58710-1 Circuit:ITB CARD 0587101 Reliance Electric 0-57418-E A/B Interface Module 57C418 RELIANCE ELECTRIC 0-57418-E 57418 A/B INTERFACE MODULE RELIANCE ELECTRIC 0-57418-A 57418 A/B INTERFACE MODULE RELIANCE ELECTRIC 0-57413-1 * * Reliance Electric 0-57400-A Input Module O-57400-A - Reliance Electric 0-57400 57400 115V AC/DC Input Board Reliance Electric 0-57301-1 0573011 Battery Backup Board - Reliance Electric 0-57008 Switch Receiver 057008 RELIANCE ELECTRIC 0-57006 057006 Reliance Electric 057006 Industrial Control System RELIANCE ELECTRIC 0-57006 ADAPTER KIT FOR TEST METER 057006, 705354-75A RELIANCE ELECTRIC 0-57006 ADAPTER KIT FOR TEST METER 057006 14C225 RELIANCE ELECTRIC 0-57004 PRINTED CIRCUIT TACH. FEEDBACK KIT ***XLNT*** Reliance Electric 0-57003 RELIANCE ELECTRIC 0-57002-E 057002E RELIANCE ELECTRIC 0-57002 057002 RELIANCE ELECTRIC 0-57002 SPEED PRESET INTERFACE BOARD 057002 Reliance Electric 0-57002 Pre-set Speed Interface Board Reliance Electric 0-57002 Drive Card PCB Preset Speed ! WOW ! Reliance Electric 0-57002 705358-50B PC Board Preset Speed Interface RELIANCE ELECTRIC 0-5700 05700 Reliance Electric 0-56313-1 controller inverter 0563131 RELIANCE ELECTRIC 0-56302 056302 RELIANCE ELECTRIC 0-56302 056302 Reliance Electric 0-55350-10-B 802289-51B Circuit Board Assembly 99739-618 9748 RELIANCE ELECTRIC 0-55325-9 RELIANCE ELECTRIC 0-55320 055320 Reliance Electric 0-55320 Printed Circuit DV/DT Card 460V Minpak Control Board Reliance Electric 0-55320 Capacitor Circuit Board-Printed DV/DT Card 460V NIB RELIANCE ELECTRIC 0-55310 PC BOARD DV/DT PRTD PC BOARD 055310 Reliance Electric 0-55310 DV/DT CARD Board REPAIRED RELIANCE ELECTRIC 0-55307-1E POWER SUPPLY BOARD 0553071E Reliance Electric 0-55304 PC Board Start/Stop 055304 RELIANCE ELECTRIC 0-54394-6 0543946 RELIANCE ELECTRIC 0-54394-49B 05439449B Reliance Electric 0-54394-10 Circuit Board PCB Base Driver Card Free Shipping! RELIANCE ELECTRIC 0-54391 054391 RELIANCE ELECTRIC 0-54390 054390