Isolated field bus analog quantity acquisition board card

The utility model relates to the field bus computer technology field, and provides an isolation type field bus analog quantity acquisition board card comprising an I/O interface, an AD acquisition chip, an isolation circuit, a microprocessor, a CAN interface, a CAN interface conversion module, a clock and indicating lamp, an isolation power supply, a power supply interface and a power supply conversion module; the AD acquisition chip receives an input signal through the I/O interface, and the input signal is sent to the microprocessor through the isolation circuit after AD conversion; the isolation circuit electrically isolates the signal acquisition circuit from the main control circuit; the CAN interface conversion module is used for receiving and transmitting through a CAN interface to realize CAN communication; the power supply conversion module converts a current signal input by the power supply interface into a voltage signal and outputs the voltage signal to the AD acquisition chip through the isolatio