DMC-40x0 Command Reference QS • 197
QS
FUNCTION: Error Magnitude
DESCRIPTION:
The QS command reports the magnitude of error, in step counts, for axes in Stepper Position
Maintenance mode. A step count is directly proportional to the resolution of the step drive.
ARGUMENTS: QS nnnnnnnn or QSn = ? where
n is A,B,C,D,E,F,G or H or any combination to specify the axis or axes
USAGE: DEFAULTS:
While Moving Yes Default Value 0
In a Program Yes Default Format 1.4
Command Line Yes
OPERAND USAGE:
_QSn contains the error magnitude in drive step counts for the given axis.
RELATED COMMANDS:
YA Step Drive Resolution
YB Step Motor Resolution
YC Encoder Resolution
YR Error Correction
YS Stepper Position Maintenance Mode Enable, Status
EXAMPLES:
1. For an SDM-44140 microstepping drive, query the error of B axis:
:QSB=?
:253 This shows 253 step counts of error. The SDM-44140
resolution is 64 microsteps per full motor step, nearly
four full motor steps of error.
2. Query the value of all axes:
:QS
:0,253,0,0,0,0,0,0
Response shows all axes error values
Notes:
1. When QS exceeds three full motor steps of error, the YS command indicates the excessive
position error condition by changing to 2. This condition also executes the #POSERR
automatic subroutine if included in the runtime code.
2. The operand use of the QS command can be used in conjunction with the YR command to
correct for position error. See the YR command for more details.
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