Programmable controller

A programmable controller configured to execute a plurality of ladder programs, the programmable controller comprising:

• a processor configured to
• extract an available address setting table embedded in each of the plurality of ladder programs, the available address setting table defining a range of consecutive signal addresses used as signal write destinations by the respective ladder program,
• determine whether there is an overlap between the respective ranges of consecutive signal addresses used as the signal write destinations by the plurality of ladder programs, based on the available address setting tables,
• execute the plurality of ladder programs in response to determining that there is no overlap between the respective ranges of consecutive signal addresses used as the signal write destinations by the plurality of ladder programs, and
• in response to determining that there is overlap between the respective ranges of consecutive signal addresses used as the signal write destinations by the plurality of ladder programs,
• stop the execution of the plurality of ladder programs, and
• output information on the plurality of ladder programs including the overlapping ranges of consecutive signal addresses.