FOXBOROP0926MX化州县

FOXBOROP0926MX化州县
逻辑关系图反映了控制过程中控制作用与被控对象的活动，也反应了输入与输出的关系。 3. 绘制各种电路图 绘制各种电路的目的，是把系统的输入输出所设计的地址和名称联系起来。这是很关键的一步。在绘制 PLC 的输入电路时，不仅要考虑到信号的连接点是否与命名一致，还要考虑到输入端的电压和电流是否合适，也要考虑到在特殊条件下运行的可靠性与稳定条件等问题。 　在接地电阻方面，对plc也许要求不高，但对dcs一定要在几欧姆以下（通常在4欧姆以下）。模拟量隔离也是非常重要的。 　　相同i/o点数的系统，用plc比用dcs，其成本要低一些（大约能省40%左右）。plc没有操作站，它用的软件和硬件都是通用的，所以维护成本比dcs要低很多。如果被控对象主要是设备连锁、回路相对很少，采用plc较为合适。如果主要是模拟量控制、并且函数运算很多， 采用dcs。dcs在控制器、i/o板、通讯网络等的冗余方面，一些 运算、行业的特殊要求方面都要比plc好的多。plc由于采用通用监控软件，在设计企业的管理信息系统方面，要容易一些。

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Alerton TX-651-PULSE Ibex Tux Pulse TX651PULSE
Alerton TX-651-PULSE
ALERTON TX-450  TX450
ALERTON TX-450  TX450
Alerton TX-450 Ibex DDC Controller 4-Inputs 5-Digital Triac Outputs TX450 
Alerton TX-450 Ibex DDC Controller 4-Inputs 5-Digital Triac Outputs TX450 
ALERTON TX-16160  TX16160
Alerton TX-16160 Industrial Control System
Alerton TX-16160 Ibex Input/Output Controller TX16160
Alerton TX-16160 Bactalk controller  RETAIL $3000.00
ALERTON TX SA 651 QTY OF THREE FOR PARTS
ALERTON TUX-784ST  TUX784ST
ALERTON TUX-450ST  TUX450ST
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ALERTON TUX 784ST TUX784ST
ALERTON TUX 450ST TUX450ST(S4-T-4B)
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Alerton TS2008FB03AA Industrial Control System
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ALERTON PROBE-10IN  PROBE10IN
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ALERTON Operator Interface Control MICROVIEW GC-MVIEW Excellent Working
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Alerton MS4-TH Temperature And Humidity Sensor MS4TH 
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Alerton IBW-ETH-ADP Ethernet Adapter
ALERTON IBEX-3500  IBEX3500
Alerton IBEX/BACnet Modem 100 Communication Module
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Alerton Ibex TX-16160 DDC Controller TX16160 
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Alerton IBEX TUX-65 Digital Controller
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Alerton GC-MVIEW Operator Interface Control Panel Microview
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ALERTON Fiber Optic Link Good Condition 60 Day warranty
Alerton Fiber Optic Link
ALERTON EXP-2200  EXP2200