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17
6.2.2 Maximum movement speed, resolution, and
edge distance
There is a connection between the selected resolution of
the sensor head, the minimum edge distance, and the
possible movement speed that is illustrated in Tab. 6-1 and
BML-S1F…-M3…: system accuracy up to 10 µm
Min. edge
distance
1)
V
max
acc. to edge distance and resolution
Resolution
D
E
F
G
1 µm
2 µm
5 µm
10 µm
D
0.12 µs
5 m/s
10 m/s
20 m/s
2)
20 m/s
2)
I
0.29 µs
2 m/s
4 m/s
10 m/s
10 m/s
F
0.48 µs
1 m/s
2 m/s
5.41 m/s
5.41 m/s
G
1 µs
0.65 m/s
1.3 m/s
2.95 m/s
2.95 m/s
H
2 µs
0.3 m/s
0.6 m/s
1.54 m/s
1.54 m/s
K
4 µs
0.15 m/s
0.3 m/s
0.79 m/s
0.79 m/s
L
8 µs
0.075 m/s
0.15 m/s
0.34 m/s
0.34 m/s
N
16 µs
0.039 m/s
0.078 m/s
0.19 m/s
0.19 m/s
P
24 µs
0.026 m/s
0.052 m/s
0.13 m/s
0.13 m/s
1)
Connection between edge distance and counting frequency, see
appendix for table.
2)
BML-S1F...-M310-... (with reference sensor):
max. movement speed 10 m/s
Tab. 6-1: BML-S1F…-M3…: Selection aid for maximum movement
speed
BML-S1F…-M5…: system accuracy up to 20 µm
Min. edge
distance
1)
V
max
acc. to edge distance and resolution
Resolution
E
S
G
I
2 µm
4 µm
10 µm
20 µm
D
0.12 µs
10 m/s
20 m/s
20 m/s
20 m/s
I
0.29 µs
4 m/s
8 m/s
20 m/s
20 m/s
F
0.48 µs
2 m/s
4 m/s
10.82 m/s
10.82 m/s
G
1 µs
1.3 m/s
2.6 m/s
5.9 m/s
5.9 m/s
H
2 µs
0.6 m/s
1.2 m/s
3.08 m/s
3.08 m/s
K
4 µs
0.3 m/s
0.6 m/s
1.58 m/s
1.58 m/s
L
8 µs
0.15 m/s
0.3 m/s
0.68 m/s
0.68 m/s
N
16 µs
0.078 m/s
0.158 m/s
0.38 m/s
0.38 m/s
P
24 µs
0.052 m/s
0.104 m/s
0.26 m/s
0.26 m/s
1) Connection between edge distance and counting frequency, see
appendix for table.
Tab. 6-2: BML-S1F…-M5…: Selection aid for maximum movement
speed
If using the reference sensor, the max.
movement speed is limited to 10 m/s.
The following applies for 4x evaluation (each edge is
counted):
Counting frequency of the
controller
≥
1
Min. edge distance
Period frequency =
Counting frequency
4
Example: edge distance = 1 µs
Counting frequency = 1 MHz
Period frequency = 250 kHz
Important!
– The controller/display must be able to count
the minimum timed edge distances indicated
in the tables (note the counting frequency of
the controller!).
– The min. edge distance can even occur at a
standstill due to the internal interpolation
process.
– Always select the next-higher movement
speed or the next-faster min. edge distance,
otherwise position detection errors may be
created by the controller during evaluation.
Sensor head design for controlling with 4x
evaluation:
Example 1:
BML-S1F…-M3…
Required resolution: 5 µm
Max. movement speed: 7 m/s
►
►
Select the row 10 m/s in column F.
⇒
Edge distance E = 0.29 µs.
Example 2:
BML-S1F…-M3…
Required resolution: 10 µm
Max. counting frequency of the controller: 0.5 MHz
Edge distance: 2 µs
►
In Tab. 6-1: select row H in column G.
⇒
Maximum possible movement speed: 1.54 m/s
Coding in the type code breakdown
BML-S1F1-Q61
_
-M310-G
_
0-KA05 (example)
Min. edge distance
Resolution
For further information, see Type code
6
Interface (continued)
BML-S1F_-A/Q _ _ _ -M_ _ 0- _ 0-…
Incremental Magnetic Linear Encoder
english
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