Front channel switching method and system based on service message

The invention relates to the technical field of preposed data acquisition of an electric power automatic monitoring system, and provides a preposed channel switching method and system based on a service message, and the method comprises the steps: configuring acquisition channels, and carrying out the communication connection between a centralized control master station and a transformer substation through a plurality of acquisition channels in a hot standby manner; one of the acquisition channels is set as an on-duty channel for issuing a control instruction and receiving and processing real-time service messages, and other acquisition channels are used as standby acquisition channels for service message interaction; and judging whether the current on-duty channel is abnormal or not, if so, replacing the on-duty channel, and then issuing a control instruction and processing a service message by a new on-duty channel. By means of the method, whether the on-duty channel is in the abnormal state or not can be f