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VELOCITY MOVE
Commands the axis to accelerate and move at a defined velocity.
The motion can be modified or terminated using an event
trigger, as described above.
ANALOG INPUT POSITION MODE
This sequential instruction has been provided to allow control of
absolute position command via the analog input. The
instruction parameters allow matching an analog input range to
a commanded range of absolute system position. Thus, a servo
system can "track" an analog input signal. Figure 12.11 shows
the programming screen for this instruction.
MAXIMUM SPEED AND ACCEL / DECEL
- These parameters are
entered in similar fashion to other axiom+ motion instructions.
These parameters are both unsigned and effectively limit the
speed of position tracking response to rapid changes in the
command analog input. Maximum speed can be assigned to a
velocity register, as well.
ANALOG POSITION CONVERSION FACTOR
- This allows the
user to set the gain applied to analog voltage to determine
absolute position command. A value of 1 for this parameter
would mean that a change of 1 volt in the analog input signal
would provide for a change of 1 user unit in the commanded
position.
ANALOG COMMAND POSITION OFFSET
- This parameter
provides a means of programming an offset or shift in the range
of commanded absolute position. The user should enter the
position that would correspond to a zero volt analog input for
this parameter.
Once Analog Input Position Control Mode is executed, absolute
position will immediately begin to track the analog input based
on the programmed parameters. Cycle pause and resume
functions will work to pause and resume motion. The sequential
program will halt at this instruction and motion will track the
analog input until the "exit" condition occurs, which is a logic 1
state for the programmed exit flag.
1 2 : P R O G R A M M I N G
12-12
