The invention provides a device and a method for generating an interruption/event of an upper CPU in a PLC module. The CPU and the PLC module communicate through a master-slave communication bus, each PLC module comprises the device, the device comprises: a line or component, wherein an interruption/event request signal generated by the PLC module is output to the CPU by the line or component; a three-state gate component used for receiving an interruption/event reading signal sent by the CPU to the PLC module, and when processing the interruption/event communication of a specific PLC module according to a default priority level, cutting off the interruption/event requests of the PLC modules behind the specific PLC module; and an ANDgate component used for carrying out an AND operation on the interruption/event request signal and the interruption/event reading signal, wherein the output of the AND gate component enables the specific PLC module to communicate with the CPU, and then the CPU obtains the address of the specific PLC module to carry out response processing of the interruption/event. The PLC module is serially connected to an interruption/event reading signal line through a three-state gate. The request signals generated by the PLC modules are directly connected together by corresponding lines or components, and then are connected to the CPU.