SANS 60947-5-6-1999 低压开关和控制器.第5.6节:控制电路电器和开关元件.接近传感器和开关放大器的DC接口
Low-voltage switchgear and controlgear Part 5-6: Control circuit devices and switching elements - DC interface for proximity sensors and switching amplifiers (NAMUR)
Applies to proximity sensors connected for operation by a two-wire connecting cable to the control input of a switching amplifier. The switching amplifier contains a d.c. source to supply the control circuit and is controlled by the variable internal res