描述
入信号不进入PLC系统中有些信号功能简单、涉及面窄，如图6中的手动按钮、过载保护的热继电器触点等，有时就没有必要作为PLC的输入，将它们设计在PLC外围的硬件电路中同样可以满足控制要求。如果外部硬件电路过于复杂，则应考虑仍将有关信号送入可编程序控制器
National Instruments AT-MIO-16F-5 Data Acquisition Sys
Expedited shipping available
National Instruments PCI-6034E DAQ Card w IO Block &Cbl
NATIONAL INSTRUMENTS GPIB-PCII/IIA ISA IEEE 488
National Instruments 777642-08 PCI 8 port RS232 bd
National Instruments. PXI-8250. System Monitor Module.
NATIONAL INSTRUMENTS 76507-02 TYPE X2
National Instruments. PXI-6713. HS Analog Output 12 Bit
National Instruments #778069-07 FP-AI-V5 New Sealed
National Instruments GPIB-PCII/IIA 776113-01 New In Box
Comes with unopened Software!
