
B–64160EN/01
4. DESCRIPTION OF PARAMETERS
65
1820 Command multiplier for each axis (CMR)
NOTE
When this parameter has been set, the power must be
turned off before operation is continued.
[Data type] Byte axis
Set a command multiplier indicating the ratio of the least command
increment to the detection unit for each axis.
Least command increment = detection unit command multiplier
Relationship between the increment system and the least command
increment
Least input increment and least command increment
IS–A IS–B Units
Millimeter machine 0.01 0.001 mm
Inch machine 0.001 0.0001 inch
Rotation axis 0.01 0.001 deg
Setting command multiply (CMR), detection multiply (DMR), and the
capacity of the reference counter
least command
increment
X CMR
Error counter
X DMR
Reference
counter
DA
Converter
Position detector
To velocity control
Feedback pulse
Detection
unit
+
–
Fig.4.14 CMR, DMR, and the Capacity of the Reference Counter
Set the magnification ratios of CMR and DMR so that the weight of
positive inputs to the error counter equals that of negative inputs.
feedback pulse unit
Least command increment
CMR
=detection unit=
DMR
The feedback pulse unit varies according to the type of detector.
Feedback pulse unit =
the amount of travel per rotation of the pulse coder
the number of pulses per rotation of the pulse coder (2000, 2500, or 3000)
As the size of the reference counter, specify the grid interval for the
reference position return in the grid method.
Size of the reference counter = Grid interval/detection unit
Grid interval = the amount of travel per rotation of the pulse coder