Rockwell Automation 57C422B 2 Axis Servo Module - Manual (Page 84)

4-56 2-Axis Servo Module M/N 57C422B
4.50.6 Register 131: Loop Back Point in Cam Table
Register 131 contains the loop back point in the time cam
profile. This register is not used when position cam is
selected. The loop back point is the profile point to which the
axis will return after reaching the end of the defined profile. If
this register is used, you must ensure that both the value for
the last point in the cam profile table and the value for the
loopback point are within the accel/decel capability of the
servo drive. The profile points between the first profile point
and the loop back point are executed only once even in the
continuous mode. This allows these initial profile points to be
used to accelerate the axis into and out of the profile. The
loopback register is not used if the cam profile is executed
only once. Note that the first point in the cam table is point
zero (0). Refer to figure 4.56.
Figure 4.55 – Cam Profile Registers