描述
PLC按结构分为整体型和模块型两类，按应用环境分为现场安装和控制室安装两类；按CPU字长分为1位、4位、8位、16位、32位、64位等。从应用角度出发，通常可按控制功能或输入输出点数选型。
整体型PLC的I/O点数固定，因此用户选择的余地较小，用于小型控制系统；模块型PLC提供多种I/O卡件或插卡，因此用户可较合理地选择和配置控制系统的I/O点数，功能扩展方便灵活，一般用于大中型控制系统。
NATIONAL INSTRUMENTS PCI-MIO-16E-1 DAQ CARD
PCIe PCI express GPIB Interface National Instruments
National Instruments Ethernet Controller GPIB-ENET
National Instruments PCI-6512 Isolated 64-Ch Outputs
National Instruments GPIB-PCII/IIA Interface Card
National Instruments GPIB-USB-HS
National Instrument PXI-5650 RF Signal Generator Module
New National Instruments NI GPIB-USB-HS Controller
National Instruments MXI-4 PXI Controller PCI-8336
National Instruments Lab-PC-1200 NI DAQ Card ISA
NATIONAL INSTRUMENTS BNC 2090 DATA CONTROLLER
National Instruments PCI-6110 NI DAQ Card 4ch 5MS/sec
NATIONAL INSTRUMENTS 182419B-01 CABLES SH6868 LOT OF 2
National Instruments Ethernet Controller GPIB-ENET/100
National Instruments NI GPIB-USB-B USB Controller Teste
NATIONAL INSTRUMENTS NI PCI-6509 Digital I/O DAQ BOARD
