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2.1.2.13
Other Applications
Other applications can be configured by modifying the stepper positioning
control system.
2.1.2.13.1
Speed Control
The Frequency/Speed Control application represents a variant of Stepper
control. All the functions for Stepper control can still be utilized. The basic
difference is the modified process image which permits frequency and speed
to be specified. Speed corresponds directly to the output frequency and the
frequency ramps to acceleration.
With this module the stepper motor is operated at the specified speed.
Frequency generation is provided with one output channel and a cycle signal,
along with a sign signal.
The output may also be switched to an "incremental encoder simulation", for
outputting two square-wave signals offset by 90°.
The frequency/speed control system generates a definable output frequency.
As with Step positioning, this frequency can be specified using the process
image, the Jog mode, the Move task via mailbox and by the Program mode.
The frequency/speed control application is only feasible with the function
"Rotary shaft". If the rotary shaft configuration value does not have a
parameter of zero, a value of 100000 is assumed.
The frequency/speed control application is selected using the configuration
parameters Application_Selector = 2 and PWM Period = 0.
All of the Stepper control functions can still be utilized. The basic difference
is that the Positioning/Stepper control mode is replaced with a Speed set
mode. Merely the speed and acceleration setting are evaluated for this in the
process image.
Position acquisition is executed in the background in the frequency/speed
control application. To prevent this from triggering a shutdown via the soft
limit switches with Drive_Range_Pos or Drive_Range_Neg, the parameters
Rotary_Axis_Period are used and parameters provided or simulated for a
rotary axis. If parameters have been provided for the value
Rotary_Axis_Period, this value is used for the rotary axis.
Step positioning/Stepper control contains a detailed description of this
(selection of mode using M_Positioning and accepting of setpoints with Start).
WAGO-I/O-SYSTEM 750
I/O Modules
750-671 [Steppercontroller]
Other Applications
• 111
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