Design of intelligent instrument I /O interface circuit based on photoelectric coupler
Xiong Jianyu · Industrial Instrumentation & Automation · 2013
In the automatic measurement and control system,there are usually some switch control from the instrument output to the control loop,and the control loop has some measured signal input into the instrument. Optoelectronic devices,photoelectric coupler to light signal as a medium to achieve coupling signal and transfer,input and output fully realize the electrical isolation,signal transmission is unidirectional,strong anti- interference capability,high transmission efficiency,therefore I / O photoelectric insulation interface circuit in the intelligent instrument input / output channel to get widely used.