Intelligent frequency input isolator

The utility model discloses an intelligent frequency input isolator which relates to an industrial automation instrument and is especially suitable for monitoring, transformation, isolation and output of frequency signals. The isolator comprises a power supply circuit, a signal sampling circuit, a CPU control part, an optocoupler isolation circuit and an output circuit, and is characterized in that the signal sampling circuit comprises a signal shaping circuit, a voltage threshold judgment circuit, a signal shaking removal circuit, a time competition eliminating circuit and an optocoupler isolation input circuit which are positioned at the left upper side of a main board; the sampling circuit is sequentially connected with the CPU control part, the optocoupler isolation circuit and the output circuit; a signal output module is connected with an I/O port of a central processor through an output module slot; and the main board comprises two groups of output module slots for inserting and pushing out the signal