When you specify a custom parameterization for a Simulink block, you might not be able
to write the tuned block value back to the Simulink model. When writing values to
Simulink blocks, Control System Tuner skips blocks that cannot represent the tuned value
in a straightforward and lossless manner. For example, if you reparameterize a PID
Controller Simulink block as a third-order state-space model, Control System Tuner will
not write the tuned value back to the block.
Block Rate Conversion
When Control System Tuner writes tuned parameters back to the Simulink model, each
tuned block value is automatically converted from the sample time used for tuning, to the
sample time of the Simulink block. When the two sample times differ, the Tuned Block
Editor contains additional rate conversion options that specify how this resampling
operation is performed for the corresponding block.
View and Change Block Parameterization in Control System Tuner