描述
对于两个重要输出量，不仅在PLC内部互锁，建议在PLC外部也进行硬件上的互锁，以加强PLC系统运行的安全性、可靠性。
对于常见的AC220V交流开关类负载，例如交流接触器、电磁阀等，应该通过DC24V微小型中间继电器驱动，避免PLC的DO接点直接驱动，尽管PLC手册标称具有AC220V交流开关类负载驱动能力。
National Instruments DAQ Signal Accessory GREAT for EDU
NATIONAL INSTRUMENTS PCI-GPIB IEEE 488.2 183617K-01
NATIONAL INSTRUMENTS NI PCI-GPIB IEEE 488.2 TESTED
NATIONAL INSTRUMENTS NI PCI-GPIB IEEE 488.2 18361TESTED
NATIONAL INSTRUMENTS NI PCI-GPIB IEEE 183617G-01 TESTED
NATIONAL INSTRUMENTS NI PCI-GPIB IEEE 488.2 183617k-01
NATIONAL INSTRUMENTS PCI-6024E DAQ CARD TESTED
National Instruments Isothermal Terminal Base , FP-TB-3
National Instruments 763507B-02 X2 GPIB 2.0 Meter
NATIONAL INSTRUMENTS NI PCI-GPIB IEEE 183617G-01
National Instruments PCI-CAN, Series 2, Single Port
Controller Area Network (CAN), High-Speed w/Software
National Instruments NI IMAQ PCI-1409 Card Tested
National Instruments PCI-6032E 16 bit DAQ
