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 SCXI-1351 One-Slot Cable Extender
One-day shipping available
National Instruments NB-DIO-24 Digital I/O Board – Maci
One-day shipping available
National Instruments GPIB Shielded Cable 8 m
National Instruments MXI Type M1 Bus Cable 180758-02
Expedited shipping available
NATIONAL INSTRUMENTS IMAQ DIGITAL TEST FIXTURE CARD
National Instruments PCI RS-232/485, 4 Port
National Instrument PCI RS-232/485 Isolated 4 port
National Instruments TBX-68 I/O Connector Block; DIN
National Instruments PCI 232/485 8ch board with cable
National Instruments TBX-96 DIN Rail Terminal Block NEW
2 National Instruments AT-GPIB/TNT ISA Card 181830-01
National Instruments GPIB-PCII/IIA ISA 181065-02E Card
(5) National Instruments GPIB 1 M Cables 763061-005
NATIONAL INSTRUMENTS PCI-6503 DAQ I/O CARD PCI-DIO-24
NATIONAL INSTRUMENTS CB-50LP UNSHIELDED I/O CONNECTOR
