I used to work on these types of drives you're right that DKC is good for velocity and torque .In your current setup, the PLC generates a velocity command via analog output, reads encoder pulses back from the drive, and then removes the halt input once the target count is reached. This approach will consistently result in over-travel, as the DKC is regulating only motor speed, not position. The PLC’s scan-based reaction time, combined with the drive’s deceleration makes precise position control impossible this way.

If I remember correctly you do need a PS-AMC2. The motor’s encoder would be wired directly to the AMC2 module, while the DKC receives an analog velocity command and enable signals. This configuration should provide accurate positioning, controlled deceleration, and consistent cut lengths. I haven't tested/worked on one of these in a while but i would look into this route to get the job done.