Cryo-con Model 24C Remote Programming Guide
Control Loop Autotune Commands
The Model 24C's control loop autotune functions can be configured and run entirely
from the remote interface. The general sequence is:
1. Configure the autotune parameters.
2. Initiate the autotune sequence.
3. Read the autotune state and wait for the sequence to complete.
4. Execute the autotune save command to transfer the generated tuning
parameters to the controller's PID values and continue with PID control.
LOOP {1 | 2 | 3 | 4}:AUTotune:STARt
Command to initiate the autotune sequence on the selected control loop.
LOOP {1 | 2 | 3 | 4}:AUTotune:EXIT
Command to abort the autotune sequence.
LOOP {1 | 2 | 3 | 4}:AUTotune:SAVE
Command to save the autotune generated PID values to the selected control
loop and continue with PID regulation.
LOOP {1 | 2 | 3 | 4}:AUTotune:MODe {P | PI | PID}
Set or query the autotune mode. Choices are P to generate P only tuning
values, PI for PI values and PID for all values. Recommended value is PID.
LOOP {1 | 2 | 3 | 4}:AUTotune:DELTap <num>
Set or query the maximum allowed change in output power that the controller
is allowed to generate. Parameter is numeric and is in percent of full-scale
output power. A common value is 5 for 5%.
LOOP {1 | 2 | 3 | 4}:AUTotune:TIMeout <num>
Set or query the autotune timeout. Parameter is numeric and is in units of
Seconds.
LOOP {1 | 2 | 3 | 4}:AUTotune:PGAin?
Query the autotune generated proportional or P-gain parameter. This query
will return a value of-1 until the autotune status is Complete".
LOOP {1 | 2 | 3 | 4}:AUTotune:PGAin?
Query the autotune generated integrator or I-gain parameter. This query will
return a value of-1 until the autotune status is Complete".
LOOP {1 | 2 | 3 | 4}:AUTotune:DGAin?
Query the autotune generated derivative or D-gain parameter. This query will
return a value of-1 until the autotune status is Complete".
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