Mitsubishi Electronics FX5 ユーザーズマニュアル

9  PID CONTROL FUNCTION
9.7  Auto-Tuning

The parameters specified in the limit cycle method are shown below.

Set forward or backward operation

Set the operation direction flag (b0) in the operation setting parameter (ACT) (s3)+1.

Select the auto-tuning method (limit cycle method)

Set the auto-tuning method to ON (b6) in the operation setting parameter (ACT) (s3)+1. (When bit 6 is set to OFF, the step 
response method is selected.)

Set the auto-tuning execution flag to ON

Set the auto-tuning execution flag to ON (b4) in the operation setting parameter (ACT) (s3)+1.

Set the input filter

Set the input filter in the operation setting parameter (ACT) (s3)+2.

Set the sampling time

Set the sampling time (s3).

Set the Upper Limit Value (ULV)

Set the Upper Limit Value (ULV) of the output value (MV) in the operation setting parameter (ACT) (s3)+26.

Set the Lower Limit Value (LLV)

Set the Lower Limit Value (LLV) of the output value (MV) in the operation setting parameter (ACT) (s3)+27.

Set the threshold (hysteresis) (SHPV)

Set the threshold (hysteresis) width (SHPV) in the operation setting parameter (ACT) (s3)+25.

Set the target value (SV)

Set the target value (SV) in PID instruction.

Set the PID instruction command input ON to start auto-tuning

Auto-tuning is executed according to the measured value (PV).
When auto-tuning is completed, the auto-tuning flag (b4 and b6) turns OFF in the operation setting parameter (ACT) (s3)+1.

Proportional gain (KP)

(s3)+3

Integral time (TI)

(s3)+4

Differential time (TD)

(s3)+6