ABB I/O控功能di814
1)控制方法上:PLC采用程序方式实现控制,容易改变或增加控制要求,且PLC的触点;
2)工作方式上:PLC采用串行工作方式,提高系统的抗干扰能力;
3)控制速度上:PLC的触点实际上是触发器,指令执行的时间在微秒级;
4)定时和计数上:PLC采用半导体集成电路作定时器,时钟脉冲由晶振提供,延时精度高,范围宽。PLC具有继电器系统不具备的计数功能;
5)可靠性和可维护性上:PLC采用微电子技术,可靠性高,所具有的自检功能能及时查出。
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Capp USA Circular Chart Recorder 412043 CR331554
GE Fanuc Input Analog 8PT IC697ALG230 IC697ALG230C
KLOCKNER MOELLER BREAKER 250A 250 A AMP NZM9-250