描述
抗干扰与外部互锁当PLC输出带感性负载，负载断电时会对PLC的输出造成浪涌电流的冲击，为此，对直流感性负载应在其旁边并接续流二极管，对交流感性负载应并接浪涌吸收电路，可有效保护PLC。当两个物理量的输出在PLC内部已进行软件互锁后，在PLC的外部也应进行互锁，以加强系统的可靠性
A77921 National Instruments PCI-GPIB Board 183617F-01
NATIONAL INSTRUMENTS NI AT-MIO/AI-16XE-10 MULTIFUNCTION
National Instruments: 181830E-01 AT-GPIB/TNT Card
National Instruments GPIB 422CV 256K 180465-02 Rev B1
National Instruments NB-DIO-24, New In Box.
National Instruments P/N 182801A-002 MXI2-1 2 m Cable
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
