ABB 086349-002 Industrial Control Circuit Board

（3） Principles of Communication and Data Interaction

When communicating with external devices, the 086349-002 control board establishes connections with other devices through its supported communication interfaces (such as RS-485, Ethernet, etc.) and communication protocols (such as Modbus, Profibus, etc.). When data needs to be sent, the control board packages and encapsulates the internally processed data according to the corresponding communication protocol format, and then sends it out through the communication interface. For example, when sending device operation data to the PLC, the control board will organize the data into the frame format specified by the Modbus protocol and transmit it to the PLC through the RS-485 interface. When receiving data from external devices, the control board parses the received data frames according to the communication protocol, extracts valid data, and transmits it to the microprocessor for subsequent processing. For example, when the upper computer sends new control parameters to the control board, the control board receives the data frame through the communication interface, parses it according to the corresponding protocol, and passes the parsed parameters to the microprocessor. The microprocessor adjusts the control strategy based on the new parameters to achieve remote control and parameter optimization of industrial equipment.