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编程设备：有简易编程器和智能图形编程器，用于编程、对系统作一些设定、监控PLC及PLC所控制的系统的工作状况。编程器是PLC开发应用、监测运行、检查维护不可缺少的器件，但它不直接参与现场控制运行。
2.监控设备：有数据和图形。直接监视数据或通过画面监视数据。
3.存储设备：有存储卡、存储磁带、软磁盘或只读存储器，用于性地存储用户数据，使用户程序不丢失，如EPROM、EEPROM写入器等。
4.输入输出设备：用于接收信号或输出信号，一般有条码读人器，输入模拟量的电位器，打印机等。
六、PLC的通信联网
PLC具有通信联网的功能，它使PLC与PLC之间、PLC与上位计算机以及其他智能设备之间能够交换信息，形成一个统一的整体，实现分散集中控制。现在几乎所有的PLC新产品都有通信联网功能，它和计算机一样具有RS-232接口，通过双绞线、同轴电缆或光缆，可以在几公里甚至几十公里的范围内交换信息。
Symbol Motorola MC9090-GF0HJEFA6WW w/ Cradle
Gun, Laser, Color, 53key, Win Mobile, Audio
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SYMBOL MOTOROLA DS9808-LR20007C2WR SCNR:DS9808-LR W RFI
SYMBOL MOTOROLA DS9808-SR00007C1WR SCNR:DS9808-SR WITH
SYMBOL MOTOROLA DS9808-SR00007C2WR SCNR:DS9808-SR W RFI
MOTOROLA SYMBOL MC9090 BARCODE SCANNER WIFI PDA MC9090G
SYMBOL, MOTOROLA MC9090-GF0HJJFA6WR, WM5.0, SE1224 !!!
CHARGING AND COMMUNICATION CRADLE KIT INCLUDED !!!!!!!!
SYMBOL MOTOROLA DS9808-SR00007C1WR SCNR:DS9808-SR WITH
SYMBOL MOTOROLA DS9808-SR00007C2WR SCNR:DS9808-SR W RFI
Lot 50 Batteries For Symbol Motorola BTRY-MC50EAB02
Symbol-Motorola MC9090-GK0HBEGA2WR Wireless Gun
MOTOROLA Symbol Assembly 2400BHRFDD *SALE*
Symbol/Motorola MC9094 Wireless Portable Terminal
w/ Zebra RW220 Mobile Printer in a Metal Case
MOTOROLA SYMBOL MC9090 BARCODE SCANNER WIFI PDA MC9090G
SYMBOL MOTOROLA MC9097 MC9097-SKTHJBHA6WW
Tons of other barcode scanning gear...just ask!
SYMBOL MOTOROLA MC9094 MC9094-SKCHJBHA6WW
Tons of other barcode scanning gear...just ask!
Motorola Symbol WiFi Barcode Scanner MC9090-GJ0HBEGA2WR
Expedited shipping available
Symbol Motorola MC7090 Barcode HandheldScanner MC70 NEW
Brand New Original Box, 12 Month Warranty, WiFi 1D
SYMBOL MOTOROLA AP-7131N-66E40-US AP-7131N: 2-RADIO AP
MOTOROLA SYMBOL MC3090 BARCODE SCANNER WIFI PDA MC3090S
SYMBOL MOTOROLA LS3578-ERBR0100UR LS3578-ER, cradle, 7'
MOTOROLA SYMBOL MC9090 MC9090K MC9094 WWAN WLAN IMAGER
SYMBOL, MOTOROLA MC9090-GK0HBEGA2WW, CE5.0, IMAGER
CHARGING AND COMMUNICATION CRADLE KIT INCLUDED !!!!!
Symbol Motorola MC7095 2D Scan Qwerty Key
- MC70 - MC7095-PKEDJQHA8WR
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MOTOROLA SYMBOL MC5574 MOBILE COMPUTER-GPS-BARCODE READ
CAMERA- BLUETOOTH- MC5574-PYCDURRA9WR
SYMBOL MOTOROLA LS3578-ERBU0100UR KIT:LS3578-ER, cradle
SYMBOL MOTOROLA LS3578-ERBR0100UR LS3578-ER, cradle, 7'