描述
在工业生产过程当中,存在一些如温度、压力、流量、液位和速度等连续变化的量(即模拟量),PLC采用相应的A/D和D/A转换模块及各种各样的控制算法程序来处理模拟量,完成闭环控制。PID调节是一般闭环控制系统中用得较多的一种调节方法。过程控制在冶金、化工、热处理、锅炉控制等场合有非常广泛的应用。
SYMBOL MOTOROLA CR0078-SC10007WR CRDL:STD BASE,BT,CHG,M
SYMBOL MOTOROLA STB4278-C0001WR CRD:CHGR,MULTIFACE/BT C
Motorola Symbol LS2208 Bar Code Reader
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Motorola Symbol LS2208 Bar Code Reader
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Motorola Symbol Ls2208 Bar Code Reader – Handheld Bar
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SYMBOL MOTOROLA LS2208-1AZR0100DR RS232 KIT:US P/S,CRW
SYMBOL MOTOROLA LS2208-7AZR0100DR RS232 KIT:US P/S,TWB
SYMBOL MOTOROLA LS2208-7AZR0100GR KT:LS2208,BLK,RS232 C
SYMBOL MOTOROLA KT-5181-HW-01R KIT: AP-5181 HEAVY WEATH
SYMBOL MOTOROLA LS2208-SR20001R-KR SCANNER,KBW KIT,CRW(