描述
用PLC实现对系统的控制是非常方便的。这是因为：首先PLC控制逻辑的建立是程序,用程序代替硬件接线。编程序比接线，更改程序比更改接线，当然要方便得多！
其次PLC的硬件是高度集成化的，已集成为种种小型化的模块。而且，这些模块是配套的，已实现了系列化与规格化。种种控制系统所需的模块，PLC厂家多有现货供应，市场上即可购得。所以，硬件系统配置与建造也非常方便。
National Instruments NI PCI-6503 (PCI-DIO-24) DAQ Card
National Instruments: PXI-1000B 8-slot 3U PXI Chassis
National Instruments PXI 1000B chassis MXI-3 controller
NATIONAL INSTRUMENTS CB-50LP UNSHIELDED I/O CONNECTOR
NATIONAL INSTRUMENTS SCXI-1000 WITH 4 SCXI-1100
New National Instruments CB-50LP Unshielded I/O Connect
NATIONAL INSTRUMENTS PXI-6031E AND NI- DAQ W/SOFTWARE
NATIONAL INSTRUMENTS NI DEVELOPMENT SUITE AS SHOWN ONLY
National Instruments PCI SERIAL RS-232/485 185729C
National Instruments nuDrive Motion Controller 4-Axis
NATIONAL INSTRUMENTS FP-TB-1 UNIVERSAL TERMINAL BASE
National Instruments. SCXI-1326. Terminal Block.
