
B-63943EN-1/02 1.AXIS CONTROL
- 109 -
(2) M series
Least input increment and least command increment Increment
system
IS-A IS-B IS-C IS-D IS-E Unit
Millimeter
machine
0.01 0.001 0.0001 0.00001 0.000001 mm
Millimeter
input
0.001 0.0001 0.00001 0.000001 0.0000001 inch
Rotation
axis
0.01 0.001 0.0001 0.00001 0.000001 deg
Setting command multiply (CMR), detection multiply (DMR), and the
capacity of the reference counter
least
command
increment
×
CMR
Error counter
DA
Converter
×
DMR
Position
detector
Reference counter
Command pulse
Feedback
pulse
Detection
unit
To
velocity
control
-
+
Set CMR and DMR so that the pulse weight of + input (command
from the CNC) into the error counter matches the pulse weight of
-input (feedback from the position detector).
[Least command increment]/CMR=[Detection unit]=[Feedback pulse
unit]/DMR
[Least command increment]: Minimum unit of commands issued from
the CNC to the machine
[Detection unit]: Minimum unit for machine position detection
The unit of feedback pulses varies, depending on the type of detector.
[Feedback pulse unit]=[Amount of travel per rotation of the pulse
coder]/[Number of pulses per rotation of the pulse coder]
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]=[Amount of travel per rotation of the pulse coder]
The setting of a command multiplier is as follows:
(1) When command multiplier is 1 to 1/27
Set value = 1 / command multiplier + 100
Valid data range : 101 to 127
(2) When command multiply is 0.5 to 48
Set value = 2 × command multiplier
Valid data range : 1 to 96