Control system with changable time-shared execution of ladder and non- ladder programs

摘要

The present invention allows a programmable controller in a stored program system to easily execute even complex sequence control. A memory (50) has stored therein a first program of the ladder type and a second program described in another program language such as PASCAL or FORTRAN. First and second setting devices (51) and (52) set the execution times for processing by the first and second programs, respectively. A management device (53) executes the processing according to the first and second programs alternately for the periods of time set by the first and second setting device (51) and (52).