VS4 Family of Multi-Axis Motion Controllers0 pages

VS4 Family
DESCRIPTION
The VS4 intelligent motion control allows control of up to 4
axes of motion control in one slot of a VME bus computer.
From the factory, all axes are controlled through 5 VME short
address ports for control, status feedback, data, commands
and the VME bus interrupt vector. Each axis has a separate
command queue allowing the host computer to transfer a
command string then proceed with other tasks, while the VS4
manages the motion process.
The computer can be
interrupted at any point in the command stream to coordinate
the motion process with other activities. Each axis can perform
individual unrelated moves or they can be coordinated as
required by the application.
The VS4 generates step and direction pulses for control of the
most popular step motor drivers. It also supports servo or
linear motor controllers which accept step and direction inputs.
The VS4 supports high resolution micro stepping of 50,000
steps per revolution with a standard 200 step per revolution
(1.8 degree per step) stepping motor by developing the high
pulse rates required for these applications. This high resolution
allows the stepping motor to run smoothly at all speeds and
minimizes low speed torque loss due to mechanical resonance
effects. The velocity streaming mode allows an arbitrary move
contour under control of the VME bus computer. Constant
velocity contouring, with linear interpolation on up to six axes
and circular interpolation on any two axes, provides constant
tool velocity for machining applications.
Simple ASCII commands can be easily sent to the board from
any high level language, which allows input and output to an
I/O device, for example Visual Basic or C. I/O lines are
available to synchronize moves to external events and an
auxiliary line is associated with each axis, which allows the user
to control external events. Complex move sequences, time
delays, status checks and control of other external events can
be programmed through the VME bus interface.

FEATURES
• Output is step & direction
• Independent and coordinated motion of all
axes
• Each axis has a pair of limit inputs plus a
home input as well as an auxiliary output for
drive or amplifier current control.
• Up to 8 "user definable" TTL I/O lines
• All control signals are on the P2 connector
• Independent and coordinated motion of all
axes
• Circular interpolation
• Electronic gearing
• Circular interpolation
• Constant velocity linear interpolation (all
axes)

Incremental encoder feedback is available on up to four axes
models for those applications requiring precise position
feedback and/or correction. The encoder feedback can correct
for position errors, monitor for slip or stall or allow tracking of
one motor with another.
PROGRAMMING
The OMS motion controls are easily programmed with double
character ASCII commands through an extensive command
structure. These commands are combined into character
strings to create sophisticated motion profiles. It includes an
800 command and parameter buffer for each axis and a
command loop counter which allows multiple executions of
most command strings.

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