描述
从控制方法上看,电器控制系统控制逻辑采用硬件接线,利用继电器机械触点的串联或并联等组合成控制逻辑,其连线多且复杂、体积大、功耗大,系统构成后,想再改变或增加功能较为困难。另外,继电器的触点数量有限,所以电器控制系统的灵活性和可扩展性受到很大限制。而PLC采用了计算机技术,其控制逻辑是以程序的方式存放在存储器中,要改变控制逻辑只需改变程序,因而很容易改变或增加系统功能。系统连线少、体积小、功耗小,而且PLC所谓“软继电器”实质上是存储器单元的状态,所以“软继电器”的触点数量是无限的,PLC系统的灵活性和可扩展性好。
Cutler-Hammer Dry Type Xf C3000C2A
One-day shipping available
Cutler Hammer D850MPM D850 Micro Panelmate **LNC**
Expedited shipping available
CUTLER HAMMER D500-AIM220 USPP D500AIM220
CUTLER HAMMER D500-DM32A24R NSFP D500DM32A24R
CUTLER-HAMMER HUPF05172 CIRCUIT BREAKER DUAL MOUNT*NNB*
new Cutler Hammer l630e lge3630nn circuit breaker
One-day shipping available
nEW Cutler Hammer breaker DK2400W 400 amp dk 2 pole
One-day shipping available
CUTLER HAMMER SIZE 3 ADVANTAGE STARTER W200M3CFC
CUTLER HAMMER 2HP ADJUSTABLE FREQ DRIVE AF93AG0C002D
Cutler-Hammer PanelMate 1570PM Operator Touchscreen
9082A6501 NEW CUTLER HAMMER 9082A 6501 FREE SHIPPING
One-day shipping available
Cutler-Hammer AF-95AGOCO50VI3L1M Ad.Freq.Drive-50HP