Command Descriptions
257
SCLD
Distance
Scale Factor
Type
Scaling
Syntax
<a_><!>SCLD<i>
Units
i = counts/unit
Range
1 - 999,999
Default
1
Response
SCLD: *SCLD1
See Also
[ ANI ], D, [ FB ], FOLRN, FSHFD, [ PC ], [ PCC ], [ PCE ],
[ PCMS ], [ PE ], [ PER ], PSET, [ PSHF ], [ PSLV ], REG,
REGLOD, SCALE, SCLA, SCLV, SCLMAS, SFB, SMPER, TANI, TFB, TPC,
TPCC, TPCE, TPCMS, TPE, TPER, TPSHF, TPSLV, TSTAT
Product Rev
GT6K 6.0
GV6K 6.0
NOTE
: All scaling settings (
SCALE
,
SCLA
,
SCLD
,
SCLV
and
SCLMAS
)
are automatically saved in the Gem6K’s battery-backed RAM.
If scaling is enabled (
SCALE1
), the Gem6K internally multiplies certain commands (see list below) by the
Distance Scale Factor (
SCLD
) value.
Standard Motion
Following (Follower Axis only)
D
PESET
PSET
REG
REGLOD
SMPER
STRGTD
[ ANI ]
[ FB ]
[ PC ]
[ PCC ]
[ PCE ]
[ PE ]
[ PER ]
TANI
TFB
TPC
TPCC
TPCE
TPE
TPER
FOLRN
FSHFD
[ PCMS ]
[ PSHF ]
[ PSLV ]
TPCMS
TPSHF
TPSLV
Since the
SCLD
units are in terms of counts/unit, all distances will thus be internally represented in counts.
For instance, if your distance scaling factor is 10000 (
SCLD10000
) and you enter a distance of 75 (
D75
),
the actual distance moved will be 750,000 counts. (10000 x 75 = 750,000 counts)
This command is useful for allowing the user to specify distances in any unit. For example, if the user had a
25000 step/revolution drive and wanted distance units in terms of revolutions, then
SCLD
should be set to
25000, and scaling should be enabled (
SCALE1
).
As the distance scaling factor (
SCLD
) changes, the resolution of all distance commands and the number of
positions to the right of the decimal point also change (see table below). A distance value with greater
resolution than allowed will be truncated (e.g., if scaling is set to
SCLD25ØØØ
, the
D1.99999
command
would be truncated to
D1.9999
).
SCLD
(counts/unit)
Distance Resolution (units)
Distance Range (units)
Decimal Places
1 - 9
1
0 -
±
999,999,999 0
10 - 99
0.1
0.0 -
±
99,999,999.9 1
100 - 999
0.01
0.00 -
±
9,999,999.99 2
1000 - 9999
0.001
0.000 -
±
999,999.999 3
10000 - 99999
0.0001
0.0000 -
±
99,999.9999 4
100000 - 999999
0.00001
0.00000 -
±
9999.99999 5
FRACTIONAL STEP TRUNCATION
If you are operating in the preset positioning mode (
MCØ
), when the distance scaling factor (
SCLD
) and
the distance value are multiplied, a fraction of one step may possibly be left over. This fraction is
truncated when the distance value is used in the move algorithm. This truncation error can accumulate
over a period of time, when performing incremental moves continuously in the same direction. To
eliminate this truncation problem, set the distance scale factor (
SCLD
) to 1, or a multiple of 10.
More about scaling
, including scaling examples, refer to page
16
.
www.comoso.com
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