Programmable controller

A programmable controller for executing a plurality of sequence programs by repeating an execution cycle of successively executing fractions of the plurality of sequence programs, comprising:

• input means for setting target scan time for each of the sequence programs;
• measuring means for measuring total execution time taken for actually executing each of the plurality of sequence programs;
• and
• execution period allotting ratio calculation means for calculating a ratio of allotting an execution period for each of the plurality of sequence programs in one execution cycle based on the set target scan time and the measured total execution time for each of the plurality of sequence programs,
• wherein the plurality of sequence programs are executed by repeating the execution cycle of successively executing fractions of the plurality of sequence programs according to the calculated execution period allotting ratio.

A programmable controller for executing a plurality of sequence programs by repeating an execution cycle of successively executing fractions of the plurality of sequence programs, comprising:

• input means for setting a target scan time ratio for the plurality of sequence programs;
• measuring means for measuring total execution time taken for actually executing each of the plurality of sequence programs;
• and
• execution period allotting ratio determining means for determining a ratio of allotting an execution period for each of the plurality of sequence programs in one execution cycle based on the set target scan time ratio and the measured total execution time for each of the plurality of sequence programs,
• wherein the plurality of sequence programs are executed by repeating the execution cycle of successively executing fractions of the plurality of sequence programs according to the determined execution period allotting ratio.

A programmable controller for executing a plurality of sequence programs by repeating an execution cycle of successively executing fractions of the plurality of sequence programs, comprising:

• means for determining the number of steps in each of the plurality of sequence programs;
• and
• execution period allotting ratio determining means for determining a ratio of allotting an execution period for each of the plurality of sequence programs in one execution cycle based on the determined number of steps in each of the sequence programs,
• wherein the plurality of sequence programs are executed by repeating the execution cycle of successively executing fractions of the plurality of sequence programs according to the determined execution period allotting ratio.

A programmable controller for executing a plurality of sequence programs by repeating an execution cycle of successively executing fractions of the plurality of sequence programs, comprising:

• measuring means for measuring total execution time taken for actually executing each of the plurality of sequence programs;
• condition input means for setting a condition for adjusting an execution period allotting ratio of allotting an execution period for each of the plurality of sequence programs in one execution cycle;
• and
• execution period allotting ratio determining means for determining the execution period allotting ratio based on the measured total time for each of the plurality of sequence programs and the set condition,
• wherein the plurality of sequence programs are executed by repeating the execution cycle of successively executing fractions of the plurality of sequence programs according to the determined execution period allotting ratio.