Landing station printing plate program upgrading method based on CAN communication

The invention discloses a landing printing plate program upgrading method based on CAN communication, and belongs to the technical field of industrial automation control, and the method comprises the following steps: S1, carrying out power-on initialization, and detecting whether a broadcast frame which is sent by a mainboard system and enters a Boot mode exists or not by a subsystem of a landing printing plate system; if so, entering the Boot system; s2, when a subsystem of the landing printing plate system enters a Boot system, a handshake signal frame is sent, and the landing printing plate system conforming to an own equipment address enters a downloading state; and S3, the subsystem of the landing printing plate system entering the downloading state sends the to-be-upgraded data program. The method comprises the following steps: sequentially handing over each landing subsystem meeting conditions to a Boot system, sequentially entering a downloading mode, and returning a handshake response frame; and othe