
B-65150E/04 2. SETTING α SERIES SERVO PARAMETERS
− 17 −
(9) Specify the number of velocity pulses and the number of position
pulses.
Full-closed
Semi-closed
Parallel type
Serial liner
scale
Serial rotary
scale
Command
unit (µm)
1 0.1 1 0.1 1 0.1 1 0.1
Initialization
bit
b0 = 0 b0 = 0 b0 = 0 b0 = 0 b0 = 1 b0 = 0 b0 = 1 b0 = 0 b0 = 0
Number of
velocity
pulses
8192 8192 8192 8192 819 8192 819 8192 8192
Number of
position
pulses
12500 12500 12500 Ns Ns/10 Ns Ns/10 Np Np
Ns : Number of position pulses from the separate detector when
the motor makes one turn
Np: 12500 × (motor-to-table deceleration ratio or acceleration
ratio)
(Example: When the motor rotates ten turns while the table
rotates one turn: Np = 12500/10 = 1250)
Conventionally, the initialization bit, bit 0 (high-resolution bit), was
changed according to the command unit. The command unit and
initialization bit 0 have no longer been interrelated with each other in
all CNCs except the Series 0-C and Series 15-A.
Of course, the conventional setting method may also be used. For
easier setting, however, set the bit as follows:
Semi-closed: Initialization bit bit 0 = 0
Full-closed: Initialization bit bit 0 = 1
Only when the number of position pulses exceeds
32767.
In the above table, the number of position pulses is likely to exceed
32767 when the command unit is 0.1 µm in full-closed mode.
When using a separate detector (full-closed mode), also specify the
following parameters:
(When using the separate serial detector, see Subsec. 2.1.4.)
Series 0−C
#7 #6 #5 #4 #3 #2 #1 #0
0037 STP8 STP7 STP4 STPZ STPY STPX
STPX to 8 (#0 to #5) The separate position detector is:
0: Not used for the X-axis, Y-axis, Z-axis, fourth axis, seventh axis,
or eighth axis
1: Used for the X-axis, Y-axis, Z-axis, fourth axis, seventh axis,
and eighth axis