IC697BEM733
IC697BEM733
IC697BEM733
当PLC运行时，是通过执行反映控制要求的用户程序来完成控制任务的，需要执行众多的操作，但CPU不可能同时去执行多个操作，它只能按分时操作（串行工作）方式，每一次执行一个操作，按顺序逐个执行。由于CPU的运算处理速度很快，所以从宏观上来看，PLC外部出现的结果似乎是同时（并行）完成的。这种串行工作过程称为PLC的扫描工作方式。
用扫描工作方式执行用户程序时，扫描是从***条程序开始，在无中断或跳转控制的情况下，按程序存储顺序的先后，逐条执行用户程序，直到程序结束。然后再从头开始扫描执行，周而复始重复运行。
PLC的扫描工作方式与电器控制的工作原理明显不同。电器控制装置采用硬逻辑的并行工作方式，如果某个继电器的线圈通电或断电，那么该继电器的所有常开和常闭触点不论处在控制线路的哪个位置上，都会立即同时动作；而PLC采用扫描工作方式（串行工作方式），如果某个软继电器的线圈被接通或断开，其所有的触点不会立即动作，必须等扫描到该时才会动作。但由于PLC的扫描速度快，通常PLC与电器控制装置在I/O的处理结果上并没有什么差别。
备货，备货，降降降，火火火，火火火……
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SIEMENS SENTRON HND63F120 CIRCUIT BREAKER 1200 AMP 1000
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SQUARE D KI36175 I-LINE CIRCUIT BREAKER 175 AMP
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FISHER ROSEMOUNT PROVOX I/O DRIVER CL7675X1-BA1 41***10
TITERTEK 52178 TITAN MULTIDROP 384 THERMO LABSYSTEMS 83
SQUARE D I-LINE AP-506G-10 600 AMP 480V 10' PLUG IN BUS
KEYENCE LCD COLOR MONITOR CA-MN81
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SQUARE D PQ 4220 G I LINE FUSIBLE BUSWAY SWITCH 200 AMP
SQUARE D PQ4620G BUSWAY SWITCH 200 AMP 480 V 3 PH 4 WIR
SQUARE D I-LINE 60 AMP 240V BUSWAY F BUS PLUG 3
ALLEN BRADLEY 1 HP AC VFD 380/460 VOLT 1305-BA03A-ES
SIEMENS BULLDOG BOS16423U 100 AMP BUSWAY F BUS
ALLEN BRADLEY 1336S-B010-AN-EN4 DRIVE 10 HP DRIVE 480 V
WATT STOPPER ***ARTWIRED LIGHTING CONTACTOR GE RR7
SQUARE D 400 AMP MAIN LUG I-LINE ELECTRICAL PANEL 480Y/
BELL & GOSSETT 2DES3F4T1G1A SUBMERSIBLE PUMP 2"
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ESI LASER GALVO DRIVER BOARD CKA 67412
GE SPECTRA ADS32200HS 200 AMP FUSEABLE PANEL BOARD SWIT
ALLEN BRADLEY 2707-L8P2X DATA LOADER SERIES C
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3M DIAMOND GRINDING WHEEL GENRBDW31798 SIZE 2A2T, 9
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KRAUSS MAFFEI CONTROL MODULE SR-501 5089435
K PATENTS PROCESS INSTRUMENTS DTR-U-GP PROCESS REFRACTO
FISHER PROVOX COMMUNICATION INTERFACE CL7652X1-A1
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PARKER HYDRAULIC PUMP MOTOR M2B-90631-02
CAL-VAL ANGLE COMBINATION PRV 2" PRESSURE REDUCING
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EXAC MASS FLOW TRAN***ITTER 115/230 VOLT AC 8300EX
GE STATIC FREQUENCY RELAY 12SFF31A1A
ABB 20 HP VFD DRIVE ACS501-020-4-00P2 440-500 VAC
GRISWOLD 3 HP SELF-PRIMING PUMP 3-1/4 X 2-1/8 182JM
FLOW PRODUCTS PACO PEDESTAL SUMP PUMP 45-20950-44XX...
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TOSHIBA 10 HP AC VFD DRIVE VT130E2U4110 VOLT 480
DURAKOOL DFC3-301 MERCURY DISPLACEMENT RELAY 150 AM
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UNISYS UM4100 ALARM MONITORING SYSTEM FOR REMOTE LO
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GRUNDFOS C650006P1 STAINLESS STEEL PUMP 3PH 2.95 HP 240
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ADEPT B INDICATORS SERVO AMPLIFIER DRIVE 10300-15400
EDWA*** BAROCEL VACUUM PRESSURE TRANSDUCER W6D04181
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METTLER TOLEDO STAINLESS PLATFORM SCALE 240 LB 30X24
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GE F BUS PLUG 100 AMP 240 VOLT 3 PHASE DE423R
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