1747-OS501 AB
(五)冗余功能的选择
1．控制单元的冗余
(1)重要的过程单元：（包括存储器）及电源均应1B1冗余。
(2)在需要时也可选用PLC硬件与热备软件构成的热备冗余系统、2重化或3重化冗余容错系统等。
2．I/O接口单元的冗余
(1)控制回路的多点I/O卡应冗余配置。
(2)重要点的多点I/O卡可冗余配置。3）根据需要对重要的I/O信号，可选用2重化或3重化的I/O接口单元。
(六)经济的考虑
选择PLC时，应考虑能价格比。考虑经济时，应同时考虑应用的可扩展、可操作、投入产出比等因素，进行比较和兼顾，终选出较满意的产品。
National Instruments NI PXI-6533 HS Digital/Pattern IO
National Instruments NI PCI-232/8, RS-232 8-Ports
National Instruments NI SCXI-1301 TERMINAL BLOCK
National Instruments NI-HSDIO Driver Ver. 1.5.3 501199K
National Instruments FLKM 50 – 50 Pin Breakout DIN Mont
National Instruments NI PCI-6035E DAQ
BNC- 68 Pin Male National Instruments doesn’t have THIS
National Instruments PCI-6551 NI DAQ Card 50MHz HSDIO
National Instruments AT-MIO-16E-1 card
National Instruments PCI-6115 NI DAQ Card 4ch 10MS/sec
NATIONAL INSTRUMENTS GPIB-SCSI-A CONTROLLER
National Instrument cFP-TC-120 and cFP-CB-3
National Instruments CB-2162 Proto VHDCI – FREE WW SHIP
National Instruments PCI-MIO-16E-1 / 6070E – NEW – 2010
National Instruments Terminal Base FP TB-10 Dual Ch
NATIONAL INSTRUMENTS PCI-6251 DATA ACQUISITION
National Instruments Digital I/O PC Card DAQCARD-DIO-24
National Instruments: 180950-01, SC-2070 Board, Rev. D
*NATIONAL INSTRUMENTS GPIB-422CT
National Instruments MXIbus Bulkhead Cable MB-4 66-PIN
National Instruments PCI-6713 NI DAQ Card Analog Output
VHDCI Breakout for National Instruments NI PCI-6229
National Instruments 181485-01 SC-2054 Rev. B
NATIONAL INSTRUMENTS R1005050 182762B-01 NEW 182762B01
National Instruments SH100100 2-Meter E-Series Cable
National Instruments NI GPIB-120B Isolator and Expander
68 Pin Break w/F V Conn for National Instruments Qty 10
NATIONAL INSTRUMENTS SCXI-1326 TERMINAL BL0CK
