PLC由哪几部分硬件组成？
PLC的硬件一般由主机、I/O扩展机及外部设备组成。
（1）主机包括：微处理器（MPU）。常用的微处理器有：Z80A、8085、M6800、M6809、8086、M68000。单片机有：8039、8031、M6801。
存储器：PLC的存储器用于存储程序和数据，一般采用ROM或EPROM。
I/O接口：I/O接口是主机与外部设备、I/O模块等的连接部件，用于扩弃PLC总线的驱动能力输入输出点数。
（2）电源：电压范围在160VAC-260VAC。
（3）输入/输出模块：用于调理输入输出信号，对输入信号进行滤波、隔离、电平转换等。包括直流开关量输入模块，交流开关量输入模块，直流开关量输出模块，交流开关量输出模块。
（4）功能模块：包括A/D模块和D/A模块，温度传感器模块，高速计数模块，PID模块，远程I/O模块，通讯模块。
（5）扩展口
（6）编程器
（7）其他外设：打印机，显示器。
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FESTO DSM-40-270-P-A-B 547856 BD02 PNEUMATIC VALVE WORKING
FESTO HE-D-MINI LFR-D-MINI WITH SDE1-D10-G2-R14-C-N1-M8 DIGTAL VACUUM GAGE
FESTO K-646866, K-362253, K-363161, K-364891, SPC200/P01 CONTROLLER POWER TESTED
FESTO TYPE DSR-12-180-P VALVE ASSEMBLY
FESTO TYPE DSR-12-180-P VALVE ASSEMBLY
FESTO#:13026151/031,NVLS#:02-261918-00.K-646866,K-362253,K-363163,K-364891,MPYE
FIBERSTARS 405N/30 ILLUMINATOR TESTED WORKING FREE SHIP
FILTER 3B30D,ASTEX SA86607,& CONNECTOR FROM MKS ASTEX PRODUCT8 ASTRON HF AX7640
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FINE DRIVE GEARHEAD FDS PAG90-05 [16C-22K]
FINE DRIVE GEARHEAD FDS PLG05-03(14c-14k)
FINE MECHATRONICS FS-1000C DIGITAL WEIGHING INDICATOR POWER ON TESTED
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FINE SODICK MARK EX EDW CPU-06,CPU6*FL1066* PCB BOARD
FINE SODICK MARK EX EDW HR-MOS-02A PCB BOARD
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FLUKE NETDAQ BOARD MAIN ASSY 2645A-8201
FLUKE NETDAQ BOARD PWB ASSY A/D [FFE] 932652,2645A-8203
FLUKE PM6306 AUTOMATIC RCL METER UPTO 1KHZ
FLYTECH B1-1631-NNN CPMPUTER NO HDD NO COVER TESTED WORKING FREE SHIP
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FOCUS &TRACKING BOARD B/D-V3 W.S-030616K
FOR BROOKS VACUTRAN 5 MTR5 TRANSFER ROBOT ARM 001-5370-18 FREE SHIP
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FOR KLA es32 720-11759-000 CE,740-11754-000 EB,740-21908-000 BB,720-21033-000 AC
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FOR MUSASHI FAD2100 BOARD ALN-M VER 1:09
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