描述
在PLC的编程语言中，梯形图是最为广泛使用的语言，通过PLC的指令系统将梯形图变成PLC能接受程序，由编程器键入到PLC用户存储区去。而梯形图与继电器控制原理图十分相似，主要原因是PLC梯形图的发明大致上沿用户继电器控制电路的元件符号
National Instruments: 180950-01, SC-2070 Board, Rev. D
NEW NATIONAL INSTRUMENTS PCI 232/485 8CH W/ CABLE
NATIONAL INSTRUMENTS AT-GPIB/TNT ASSY. 181830E-01 488.2
National Instruments BNC-2095 32 BNC connector
NATIONAL INSTRUMENTS GPIB-120A BUS EXPANDER/ISOLATOR
National Instruments SH48-48-A Shielded Cable 183229-01
NI National Instruments PCMCIA-232/4
National Instruments NI SH100-100-F FLEX 185095-02 2 m
Expedited shipping available
LOT NATIONAL INSTRUMENTS COMBO SOFTWARE DAQMX PXI SCXI
LOT 2 NATIONAL INSTRUMENTS 185196A CABLE 1M SH6868-8DB9
