描述
以上簡單說明了PLC的工作原理,下面我們再以實例說明為什么編寫梯形圖程序,不宜重復使用線圈。如下圖所示,設輸入采樣時,輸入映象區(qū)中X001=ON,X002=OFF,Y003-ON,Y004=ON被實際寫入到輸出映象區(qū)。但繼續(xù)往下執(zhí)行時,因X002=OFF,使Y003=OFF,這個后入為的結果又被寫入輸出映象區(qū),改變原Y003的狀態(tài)。所以在輸出刷新階段,實際外部輸出Y003=OFF,Y004=ON。許多新手就碰到過這樣的問題,為什么X001已經(jīng)閉合了,而Y003沒有輸出呢?邏輯關系不對。其實就是因為雙線圈使用造成的。
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R902077193 DRIVE SHAFT WITH BEARING ASSY BOSCH REXROTH
REXROTH 0608750085 USPP 0608750085
Rexroth Synchronous Servo Motor MHD093B-035-PP0?-BN
Rexroth Synchronous Servo Motor MHD093B-035-PP1?-BN
Rexroth Synchronous Servo Motor MHD093B-035-PP1?-BN
Rexroth Pump Control#DBEP6C06-13/45?AG24NZ4M
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A10VS010DRG/52R?-PKC64N00E BOSCH REXROTH
Rexroth Permanent Magnet Motor MAC112A-0-VD-4-?C
REXROTH PRESSURE COMPENSATED PUMP
Rexroth PPC CONTROLLER W/ETHERNET UP TO 40 AXIS
Rexroth Throttle Valve FE 40 C12/670LM FE40C12670LM
Expedited shipping available
MANNESMANN REXROTH A2V-SL1000HS 0R5 GP PUMP,USED
Rexroth Hydraulic Motor AA2FM32/61W-VSD?540
Rexroth board CSB01.1C-SE-ENS?-NNN-L1-S-NN-FW NEW
USED Mannesmann Rexroth VT-HNC100-1-13/?134 HNC100
Expedited shipping available
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Rexroth Prop Amplifier VT3013S36 R5 VT3O13S36
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Rexroth 4MC16 0 608 820 103 EC Tightening Spindle
NEW BOSCH REXROTH LTE 45 SERVO AMPLIFIER SAVE THOUSANDS
Rexroth EC304 0 608 701 018 EC Motor Tightening Spindle
Rexroth Indramat MTS-R01.2-M2-B1?.FW#10952
Rexroth 4WREE Proportional Directional Valves Hydraulic
Rexroth Indramat DKC11.3-040-7-F?W DKC11.30407FW Servo
Rexroth Indramat Servo Drive Controller TDM3020300W0
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Rexroth LTE 45 Servo Amplifier LTE-45
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REXROTH R900568613 HYDRAULIC PUMP
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REXROTH Hydraulic Pump Power Unit 5 HP#6224SO4LR2
NEW Rexroth MKD071B-035-KG0?-KN MKD071B035KG0KN Motor
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New Rexroth Indramat MHD093B Servomotor
(3057-fc)Rexroth Hydraulic Pump Unit
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HUGE LOT REXROTH HYDRAULIC DIRECTIONAL VALVES
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INDRAMAT REXROTH DAE1.1 DAE11 I/O CARD**XLNT**
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Rexroth#MNR:R900583910 Replaces Cannon#32-40-042
Bosch Rexroth Mill Type Cylinder R407999226
2139 Rexroth 1PV2V4 Variable Vane Hydraulic Pump














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