Description
采用分层结构还有一个优点,那就是DCS厂商可以根据需要选择合理的网络拓扑结构和通讯协议,在满足整个通讯系统实时性和可靠性的基础上最大限度地降低成本,从而提高整个系统的竞争力,例如在图1操作网络层通过采用流行的标准工业以太网结构和TCP/IP通讯协议,有效提高了系统的开放性,与此同时,由于以太网非常便宜,因此使整体成本有效降低。
National Instrument ER-16 SPDT Relay Accessory ER16
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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
NI National Instruments PCI-CAN Card
National Instruments doesn’t have a BNC – 68 Pin Male !
Qty 1 DUAL VHDCI Conn fr National Instruments 780390-01
NEW NATIONAL INSTRUMENTS TC-2190 THERMOCOUPLE BREAKOUT
National Instruments 181-7617-1C SCSI Card – ZX-Box Int
National Instruments NI PCI-6503 DAQ Board