Method for preparing information tables for a digital valve control apparatus

A method for preparing information tables for a digital valve control apparatus which include:

• a first memory means for storing a first information table including a plurality of different pulse number data blocks corresponding in number to a number of control pulses required for a maximum controlled variable of a digital valve, each of said pulse number data blocks consisting of pulse number data obtained by dividing a given number of control pulses for a pulse motor for driving said digital valve by a number N, said pulse number data being stored in N divisions such that a sum of pulse numbers stored in the respective divisions is equal to said given number of control pulses;
• a second memory means for storing a second information table including control pattern data consisting of a plurality of different pulse period data block, each of said pulse period data blocks consisting of pulse period data stored in N pulse period divisions corresponding to said N divisions;
• a pulse generating means for generating pulse signals to drive said pulse motor in accordance with said first and second information tables corresponding to a specified number of control pulses and control pattern;
• and external apparatus comprising an information table preparing means, a keyboard and a display provided as an external system for said digital valve control apparatus, and a write/read memory comprising said second memory means;
• the method comprising the steps of:
• (a) preparing said second information table with said external apparatus;
• (b) storing said second information table prepared in said first step in said write/read memory provided as said second memory means through a data transfer from said external apparatus;
• and
• (c) controlling said digital valve by said digital valve control apparatus with a test operation command after storing said second information table in said write/read memory through said data transfer, and disconnecting said external apparatus from said digital valve control apparatus when a desired control characteristic is obtained, and correcting said second information table by means of said external apparatus and disconnecting said external apparatus from said digital valve control apparatus after a test operation when a desired control characteristic is not obtained.