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(OP)
Just new at Simulink. Got two questions. Thanks a lot for help.

1) control logic of U in PID is based on
Delta U = Kp *e , i.e. U(i) = U(i-1) + Kp *e(i)
How to realize it based on U?  Currently just used a delay and sum to add U(i-1) into PID calculation

2) when state space model is used, I must need to linearize around steady state. How can I keep all the information such as U rather than DeltaU around stready state?

dT/dx = A* (T-T0) + B(U-U0). Basically how can I input To and U0 as constant in model?
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