Monitoring recording plug-in unit

A monitoring recording plug-in unit acquires updating data from a program data updating device. The updating data are introduced into a central processing unit (CPU) of the monitoring recording plug-in unit, the CPU transmits the updating data to a control and reporting center (CRC) processing unit for verification, the verified updating data are stored in a program data storage unit, and simultaneously the CPU transmits the verified updating data out through an interface. The monitoring recording plug-in unit is compatible with application program and ground data used by the existing LKJ2000 main machine monitoring recording plug-in unit. Vehicle-mounted software and ground software are consistent in upgrading of an LKJ2000 type train running monitoring recording device, and unified management is facilitated. Further, a main processor of the LKJ2000 main machine monitoring recording H plug-in unit adopts the motorola mc68332 and is identical with the LKJ2000 main machine monitoring recording plug-in unit in a core circuit and an peripheral port. The plug-in unit can directly replace the prior monitoring recording plug-in unit in work and facilitates unified standard management of a locomotive safety device. Simultaneously, LKJ2000 application program and data which are successfully applied in a full line are directly used, and potential danger in development of new program is avoided.