The software platform of the programmable controller runtime system is developed based on domestic hardware and real-time operating system.The platform includes data management,task scheduling,online debugging,hot spare redundancy and real-time bus.In this paper,a multi-type real-time task scheduling scheme with high precision based on adaptive scheduler and semaphore trigger mechanism is proposed,which supports microsecond-level operation cycles and meets the requirements of strong real-time application scenarios.An online incremental update scheme for compiled programs is proposed,which uses Ping-Pong principle partition switching,seamless multi-thread coordination and incremental allocation of data area to realize efficient online program replacement and section recovery.A cross-platform breakpoint and single step debugging scheme based on intelligent pile is proposed,which realizes the single step running function of graphics program and text program,and improves the efficiency of program diagnosis and troubleshooting.A real-time multi-task hot standby redundancy operation scheme for master/slave controllers is proposed,which supports program files,running data,task status synchronization,running status diagnosis and intelligent switching of primary/secondary roles.