描述
某些输入信号不进入PLC系统中有些信号功能简单、涉及面窄，如图6中的手动按钮、过载保护的热继电器触点等，有时就没有必要作为PLC的输入，将它们设计在PLC外围的硬件电路中同样可以满足控制要求。如果外部硬件电路过于复杂，则应考虑仍将有关信号送入可编程序控制器
3M /Photodyne 17XTA Fiber Optic Power Meter
Fluke 27 Analog/Digital Multimeter, Handheld
MTP SC 24F HARNESS 2 SET
ILX LIGHTWAVE LNF-320 Low Noise Filter
HP/Agilent 85680A Spectrum Analyzer System
Agilent 8168A Tunable Laser Source 1445-1596nm w 003
Agilent 8168A Tunable Laser Source 1480-1570nm w 022
Agilent 81651A Fabry Perot Laser 1550 nm
Agilent HP 2090-0210 HP 2090-0210 Color Replacement CRT
GNB EPX16 ,EPX100, EPX000 and 3 EPX300
Hendry 16176-02R+03 Fuse Power Panel
TEKTRONIX ST112 Sonet Transmission Test Set w opts
ILX Lightwave LDT-5910 Temperature Controller
