3BSE003832R1

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PLC执行程序的过程分为三个阶段，即输入采样阶段、程序执行阶段、输出刷新阶段，PLC的扫描工作过程:

（1）输入采样阶段。在这一阶段中，PLC以扫描方式读入所有输入端子上的输入信号，并将各输入状态存入对应的输入映像寄存器中。此时，输入映像寄存器被刷断。在程序执行阶段和输出刷新阶段中，输入映像存储器与外界隔离，其内容保持不变，直至下一个扫描周期的输入扫描阶段，才被重新读入的输入信号刷新。可见，PLC在执行程序和处理数据时，不直接使用现场当时的输入信号，而使用本次采样时输入到映像区中的数据。一般来说，输入信号的宽度要大于一个扫描周期，否则可能造成信号的丢失。

（2）程序执行阶段。在执行用户程序过程中，PLC按照梯形图程序扫描原则，一般来说，PLC按从左至右、从上到下的步骤逐个执行程序。但遇到程序跳转指令，则根据跳转条件是否满足来决定程序跳转地址。程序执行过程中，当指令中涉及输入、输出状态时，PLC就从输入映像寄存器中“读入”对应输入端子状态，从输出映像寄存器“读入”对应元件（“软继电器”）的当前状态。然后进行相应的运算，运算结果再存入输出映像寄存器中。对输出映像寄存器来说，每一个元件（“软继电器”）的状态会随着程序执行过程而变化。

（3）输出刷新阶段。程序执行阶段的运算结果被存入输出映像区，而不送到输出端口上。在输出刷新阶段，PLC将输出映像区中的输出变量送入输出锁存器，然后由锁存器通过输出模块产生本周期的控制输出。如果内部输出继电器的状态为“1”，则输出继电器触点闭合，经过输出端子驱动外部负载。全部输出设备的状态要保持一个扫描周期。

Steatite 12mm ceramic grinding balls media ball mill 5KG pyrotechnics glaze




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23KG of 14.5mm ceramic grinding balls media ball mill pyrotechnics glaze paint




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Ceramic lined ball media grinding mill cooling jacket price reduced




CTS Plastics Machinery Tumble Mixer blender suits 200L drum




Stevco ceramic lined ball grinding mill cooling + media




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Linear Bearing AA01H




linear bearing AA09H




Metastream Membrane Coupling Assembly Part No 7908-0030-4700 OD148 ID519 BCD130




NSK Bearing 6407 803 105X32 New




CBC P208 Pillow block bearing housing




Elliott Steam turbine Part P700D017 O Ring QTY of 8




Dresser Steam Turbine Part W119567-001 FINGER-TRIP SAP#581999




Dresser Steam Turbine Part W130176-060 NIPPLE PIPE




Shuster 10B NAA301-30 




FAG P212 




Motor shaft coupling components Fenner 2080 H




Large Bearing HA H2313 ID of sleeve 60mm




SKF Bearing NUP 2310 ECP NEW




NSK Bearing 6312ZCM 135x40 13.75 New




FAG F211 bearing housing- New




Heavy duty machine hub ID 90mm OD 280mm




Elliott Steam Turbine 863586-4 BRG Bearing LINER




Elliott Steam Turbine 827731-1 Contact Seal




Large steel sprocket




Heavy duty machine hub ID 60mm OD 145mm




Large stainless steel and graphite mechanical seal assembly




Elliott Steam Turbine 826682-4 Bearing Liner




Metastream Membrane Coupling Assembly Part No 7908-0075-4700 Flexibox John Crane




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SKF bearing 6316-2RS1 01 340K 170mm OD 80mm ID - New




2 x THK HSR30 heavy duty Linear bearing on 340mm rail




Elliott Steam Turbine 603360-42 Bearing Liner




Membrane Coupling Assembly 7902-0020-4701-?FQC 50 flexibox metastream John Crane




2 x Metastream Membrane Flexibox Coupling Part No 7901-0005-4701 OD98 ID6 BCD80




Very heavy duty stainless steel skate with urethane rollers




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Membrane Coupling Assembly MH50200 flexibox metastream OD220 ID50 BCD192




NSK PX 10 Pillow block bearing housings




Large pillow block hearing housing with bearing sleve ID 2 1/2" inch




450mm long linear bearing rail and 2x bearings




Dresser Steam Turbine Part 439-540-202 SHOE ASSY thrust bearing




Pair of P210 Pillow block housings with NSK bearings




NSK 6020 Bearing 150mm OD 10mm ID




EBH TH517M bearing housing




NTN 2U 09090907 Bearing 85mm id 180mm od




EBH TH520 bearing housing




Huge stainless sprocket chain tensioner suit 110mm od bearing 312998 NEW




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SKF bearing housing THM532ALST TH532M 3 available