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4.7.3
Servo frame format
As the servo information, the drive uses the two-phase servo generated from the gray code and
Pos A to D. This servo information is used for positioning operation of radius direction and
position detection of circumstance direction.
The servo frame consists of 6 blocks; write/read recovery, servo mark, preamble, gray code,
Pos A to D and PAD. Figure 4.6 shows the servo frame format.
1.28
0.24
s
s
ASM
W/R Recovery Field
8.52 s
Servo
Frame
4 - 18
0.20
0.84
2.76 s
s
s
SSM
SCD
Preamble
DATA
115.7 s
Figure 4.6
Servo frame format
C141-E077-01EN
0.68
0.68
0.68
s
s
s
POS
POS
POS
A
B
C
Servo
DATA
Frame
0.68
0.48
s
s
POS
PAD
D
DATA
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