The diagram below illustrates the standard
PID branch. There are variants, depending on the loops. Each variant is dealt with in the description of the
different loops.
For certain functions, the internal variables are updated by recognizing the previous value of the command. This enables switching to be made without bumps and enables integral action overflow to be avoided by recognizing the output limitations.
The output limitations apply in all loop controller operating modes.
NOTE: The RCPY input (external input address) only exists on the model loop controller.
NOTE: In manual mode, if the gradient limit is used, the OUT_MAN value (target value before limitation) may temporarily be different from the command applied on output.
Block Diagram of the PID or IMC Loop Controller
Block diagram of the PID or IMC loop controller.
