Maintaining correction value of control variables for machine controller - transferring to non-volatile memory immediately after power failure, and returning to volatile memory when power restored

摘要

The method of maintaining a correction value in a machine controller involves placing the correction value in a non-volatile memory. The correction value is determined according to measurement of the control variable. The correction value in a volatile memory is transferred to the electrical, non-volatile, over-writable memory by serial communications immediately after the power supply to the controller is interrupted. It is transferred back into the volatile memory as soon as power is restored. USE/ADVANTAGE - For controlling operating state of machine according to control variable with increased reliability.