Note: In this topic, the word pressure is used. If you are using differential force, you can replace every occurrence of pressure with force.
The Target Pressure is the calculated instantaneous ideal pressure of the axis. The Target Pressure is calculated every control loop by the target generator state machine of the RMC. The PID routine uses the difference between the Target Pressure and the Actual Pressure as its input to compute any required corrective drive.
During a move the transition of the Target Pressure toward the Command Pressure will be the perfect profile for the Actual Pressure to follow.
Why Bother?
Knowing the relationship between the Target Pressure and Actual Pressure is key to tuning the axis. The main goal in tuning the axis is to minimize the error between the Target and Actual Pressures. The plot function is a very useful visual aid in tuning the axis.
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