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DMC-3425 Chapter 6 Programming Motion• 75
LE End linear segments
BGS Begin motion sequence
EN Program end
Changing Feedrate:
The command VR n allows the feedrate, VS, to be scaled between 0 and 10 with a resolution of .0001.
This command takes effect immediately and causes VS to be scaled. VR also applies when the vector
speed is specified with the ‘<’ operator. This is a useful feature for feedrate override. VR does not
ratio the accelerations. For example, VR .5 results in the specification VS 2000 to be divided in half.
Command Summary - Linear Interpolation
COMMAND DESCRIPTION
LM nn Specify axes for linear interpolation
LM ?
Returns number of available spaces for linear segments in DMC-3425 sequence buffer.
Zero means buffer full. 512 means buffer empty.
LI x,y < n
LI a,b < n
Specify incremental distances relative to current position, and assign vector speed n.
VS n Specify vector speed
VA n Specify vector acceleration
VD n Specify vector deceleration
VR n Specify the vector speed ratio
BGS Begin Linear Sequence
CS Clear sequence
LE Linear End- Required at end of LI command sequence
LE? Returns the length of the vector (resets after 2147483647)
AMS Trippoint for After Sequence complete
AV n Trippoint for After Relative Vector distance, n
VT S curve smoothing constant for vector moves
Operand Summary - Linear Interpolation
OPERAND DESCRIPTION
_AV Return distance traveled
_CS Segment counter - returns number of the segment in the sequence, starting at zero.
_LE Returns length of vector (resets after 2147483647)
_LM
Returns number of available spaces for linear segments in DMC-3425 sequence buffer.
Zero means buffer full. 512 means buffer empty.
_VPm Return the absolute coordinate of the last data point along the trajectory.
(m=A,B)
To illustrate the ability to interrogate the motion status, consider the first motion segment of our
example, #LMOVE, where the A axis moves toward the point A=5000. Suppose that when A=3000,
the controller is interrogated using the command ‘MG _AV’. The returned value will be 3000. The
value of _CS, _VPA and _VPB will be zero.
Now suppose that the interrogation is repeated at the second segment when Y=2000. The value of
_AV at this point is 7000, _CS equals 1, _VPA=5000 and _VPB=0.