9 Internal Position
197 SD780 Series Servo Technical Manual
The point control function sets the maximum acceleration/deceleration time to 60000ms and the
minimum value to 0ms. In the point position control position trajectory planning, if the relationship
between the acceleration/deceleration time, speed and position value is unreasonable and cannot
be operated according to the set acceleration/deceleration time, the point control program will be
based on the current speed and target position value, recalculate the acceleration/deceleration
time of the operation, and run according to the re-planned acceleration/deceleration time, as
shown in the following figure:
As shown in the figure above, when the motor runs to S0 according to the set acceleration time, if
it continues to decelerate according to the set deceleration time, the final running position value of
the motor will reach the distance indicated by Pos1. In the point control position command
planning, the set target position value is Pos0. In order to ensure that the final running position of
the motor reaches the position of Pos0 accurately, it is necessary to re-plan the deceleration time
to ensure that the motor finally runs to the Pos0 position.
9.3.3 Point Control Speed and Delay Time
The point control speed reference is divided into two types: position control mode and speed
mode.
For the position mode mode, when the position command is planned, the desired running speed is
given by the speed selected by the G part of the 16 bita high word of the Pr command segment
control word. This speed value can only be given a positive speed value. When planning according
to the position command, the positive and negative values of the target position are used to set the
forward and reverse of the desired speed.
For speed mode, the target speed value is given by P n806 + POSNUM*4 when the Pr is running.
If you want to run in reverse in speed mode, you can set the value of P n806 + POSNUM * 4 to a
negative value.
During the point control operation, whether the target speed in the speed mode or the desired
speed in the position mode, the given maximum speed value is allowed to be 6000 rpm, given
speed is limit to 6000 rpm. . In the speed mode, when the given speed unit is PPS, the maximum
value of 6 000 rpm will be converted to the limit of the PPS unit.
POS0
POS1
T
S
S
0