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Function overview
Page 48
Product Manual
“Servo drive DIS-2 310/2 FB FS STO“
Version 4.0
5.3
Positioning mode
In the positioning mode, a positioning control is superimposed on the speed control. In the positioning
mode, a certain position is specified. The motor has to move to this position automatically, i.e. without
help from an external control system. In this operating mode, the controller cascade in the DIS-2 310/2
FB FS STO is extended as shown in
The position controller is a proportional controller (short: P controller). The current position is
determined based on the information that is provided by the internal encoder evaluation. The
position deviation is processed in the position controller and passed on to the speed controller as a
speed setpoint.
The trajectory generator calculates the motion profile that is needed to reach the target based on
the current position and speed. It provides the position setpoint for the position controller and a
pilot speed for the speed controller in order to improve the control dynamics for rapid positioning
processes.
The positioning control provides numerous messages that are required for the external control
system, e.g. a target-reached message and a following error message.
position
controller
+
trajectory generator
-
speed
setpoint
position
setpoint
x actual
speed feed
forward
target reached
POS
position
parameters
temp. data set
positioning
start
remaining distance
message
correction speed
dead range
following error
monitoring
following error
Position parameters of:
- positioning unit
- fieldbus
- homing
- path program
Figure 3:
Positioning control block diagram
Contrary to many competitor products, the DIS-2 310/2 FB FS STO recalculates the
entire movement during every control cycle. With this concept, positioning processes can
be changed or aborted at any time even during the movement.
This concept can be realised thanks to the high level of performance of the Motion-
Control-DSP that is used for the control process in the DIS-2 310/2 FB FS STO.