The development of data acquisition terminal based on ARM

The development of modern industry is moving toward the integration of large-scale integration and control terminals, the commonly used analog signal 4-20mA in industry still plays a greater role in the current control field. Due to the complexity of data collection outside many systems, the amount of analog collected has become more and more. At present, many design products use single-channel analog acquisition and transmission over industrial buses，pass the data to the superior control unit, then the higher-level unit processes the signal of the lower unit，Send instructions to control direct actions of subordinate units，Because the acquisition passes through the bus, the acquisition will inevitably have an access cycle. When the data collected by the lower level is too much, it will cause time delay for data acquisition. In some demanding industrial control environments, it is likely to cause danger. Because of the increasing contradiction between the acquisition of signal and the integration of control, the integration of multi-channel data acquisition and multi-channel alarm communication becomes more and more important. This article describes the design method and idea with a single ARM controller with 8 analog inputs and 48 switches. It has a certain guiding significance. (Objectives, methods, results, conclusions) This paper designed a multi-channel data acquisition system based on the ARM series STM32F107VX. Using ARM data processing speed, low power consumption, etc., 8 channels of analog quantity and 48 channels of switch were collected. And conversion, and pass the acquisition data to the upper computer through CAN communication. The experimental operation shows that the system has high collection accuracy and fast data processing, and can collect and monitor signals in real time.