描述
PLC控制器本身的硬件采用积木式结构，各厂家产品结构大同小异。以日本欧姆龙C200HE为例，为总线模板框式结构，基本框架(CPU母板)上装有CPU模板，其它槽位装有I/O模板;如果I/O模板多时，可由CPU母板经I/O扩展电缆连接I/O扩展母板，在其上装I/O模板;另一种方法是配备远程I/O从站等。这些都说明了PLC厂家将硬件各部件均向用户开发，便于用户选用，配置成规模不等的PLC，而且这种硬件配置的开放性
National Instruments AT-GPIB/TNT Plug & Play 183663B-01
National Instruments PCMCIA-GPIB CABLE 186557A-02 NEW
National Instruments NI SC-2070
SAVE $120 NI National Instruments PCI-6503 Digital I/O
NATIONAL INSTRUMENTS PC-4350 DAQ BOARD/ LOGGER SOFTWARE
NATIONAL INSTRUMENTS VXI-AO-48XDC
National Instruments NI FieldPoint FP-RTD-122 8Ch RTD
National Instrument ER-16 SPDT Relay Accessory ER16
National Instruments PCI-232/8 Serial Port w/ 68 PinCon
NATIONAL INSTRUMENTS SCXI-1160 16 CHANNEL SPDT RELAY
National instruments PCI-6036E DAQ Card 200 kS/s 16-Bit
National Instruments (NI) Breadboard Module SCXI-1181
