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Open-Loop Response

The open-loop response type is almost always used to adjust and identify axis performance. The open-loop response is the response from a current command input at u_total to the feedback control effort output at u_c. It includes the Proportional-Integral-Derivative (PID) controller, the servo filters, and the plant. In Figure: Basic Controller Block Diagram, the open-loop response is the product of C*P. You can use the open-loop response to examine axis stability and dynamic performance. This response type also shows the phase margin, gain margin, crossover frequency, and low-end gain.

 

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