Multifunction programmable controller

The utility model relates to a multifunctional programmable controller, substantially a digital operation electronic system, which is mainly applicable for control units in industrial environmental and industrial automation equipment. The print plate adopted mainly by the utility model is arranged on the body, the print plate is provided with a controller circuit, the utility model is characterized in that in the controller circuit the series communication ports are connected with a central processing unit; the signals of a power/reset circuit, the central processing unit and a PF are transferred to an upgrading circuit; A data buffer unit is respectively connected with an expansion data buffer unit, an input data buffer unit, an output data buffer unit, a state switching circuit and an upgrading circuit. The signal SW_MODE of the control unit is transferred to the state conversion circuit, WE and A15' signals are transferred to the upgrading circuit. The utility model has volume reduction and is convenient for battery replacement and wiring connection by user; detachable terminal block is adopted, and online upgrading function and state conversion switch are added so as to be convenient for user's installation and maintenance; the utility model brings great convenience for the use of consumer.