描述
大中型PLC系统应支持多种现场总线和标准通信协议（如TCP/IP），需要时应能与工厂管理网（TCP/IP）相连接。通信协议应符合ISO/IEEE通信标准，应是开放的通信网络。
PLC系统的通信接口应包括串行和并行通信接口（RS2232C/422A/423/485）、RIO通信口、工业以太网、常用DCS接口等；大中型PLC通信总线（含接口设备和电缆）应1：1冗余配置，通信总线应符合国际标准，通信距离应满足装置实际要求。
National Instruments PCI-6034E DAQ Card w IO Block &Cbl
NATIONAL INSTRUMENTS GPIB-PCII/IIA ISA IEEE 488
National Instruments 777642-08 PCI 8 port RS232 bd
National Instruments. PXI-8250. System Monitor Module.
NATIONAL INSTRUMENTS 76507-02 TYPE X2
National Instruments. PXI-6713. HS Analog Output 12 Bit
National Instruments #778069-07 FP-AI-V5 New Sealed
National Instruments GPIB-PCII/IIA 776113-01 New In Box
Comes with unopened Software!
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National Instruments NI SCXI-1102 32-channel Input
National Instruments FP-1100 DeviceNet Interface
NATIONAL INSTRUMENTS GPIB-130 BUS EXTENDER
NATIONAL INSTRUMENTS GPIB-120A BUS EXPANDER/ISOLATOR
