Programmable controller system for performing analog-to-digital conversion based on an adjustable conversion characteristic table

A programmable controller system comprising:

• a programmable controller that includes an analog unit;
• and
• a conversion-characteristic-table creation device that is connected to the programmable controller and creates a conversion characteristic table, wherein
• the analog unit includes
• a first converter to convert an analog value to a first digital value based on a first conversion characteristic, and
• a second converter to convert the first digital value to a second digital value based on a second conversion characteristic obtained from the conversion characteristic table, the conversion characteristic table comprising the first digital value and the second digital value,
• the conversion-characteristic-table creation device comprises
• a display to display a first graph indicating a conversion characteristic obtained by combining the first conversion characteristic and the second conversion characteristic indicated in the conversion characteristic table, and display a list of candidate graphic shapes, and
• an adjuster to adjust, in response to a graphic shape being selected from the list of candidate graphic shapes, the second digital value of the conversion characteristic table to reflect the selected graphic shape, and control the display to display a second graph based on the adjusted second digital value.