Maximum Movement Speed, Resolution, And Edge Distance - Balluff BML-S1G0-B7-M5E-0-S284 Serie Betriebsanleitung

BML-S1G0-B/S7_ _-M5E_-_0-(SA26-)S284
Absolute Magnetically Coded Position Measuring System
6
Interfaces (continued)
6.4.1 Maximum movement speed, resolution, and
edge distance
With the BML-S1G0-_ _ _ _-M5EQ-_0-... with magnetic
tape, the maximum movement speed depends on the
minimum edge distance and the mechanical resolution
(see Tab. 6-3).
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-largest min. edge
distance, otherwise position detection errors
may be created by the controller during
evaluation.
V acc. to edge distance and resolution
max
Min. edge
distance
D
1 µm
D 0.12 µs 5 m/s
E 0.29 µs 2 m/s
F
0.48 µs 1 m/s
G
1 µs 0.65 m/s
H 2 µs 0.3 m/s
K 4 µs 0.15 m/s
L 8 µs 0.075 m/s
N 16 µs 0.039 m/s 0.079 m/s
P 24 µs 0.026 m/s 0.052 m/s
Tab. 6-3: Selection aid for maximum movement speed with digital
real-time signal
22 english
Resolution
E F G
2 µm 5 µm 10 µm
10 m/s 10 m/s 10 m/s
4 m/s 10 m/s 10 m/s
2 m/s 5.41 m/s 5.41 m/s
1.3 m/s 2.95 m/s 2.95 m/s
0.6 m/s 1.54 m/s 1.54 m/s
0.3 m/s 0.79 m/s 0.79 m/s
0.15 m/s 0.34 m/s 0.34 m/s
0.19 m/s 0.19 m/s
0.13 m/s 0.13 m/s
Determination of a suitable BML for the available
controller:
Example (see Tab. 6-3):
Assumptions:
– Your controller can detect a min. edge distance of
0.5 μs. If there is no sensor head with this min. edge
distance, select a sensor head with a larger edge
distance.
– The max. movement speed of the system should be
1 m/s.
Determination of a suitable sensor head:
– You require a sensor head with a min. edge distance of
1 μs (type G)
– To be able to travel at max. 1 m/s, select the type with
a resolution of 2 μm (type E)
Determination of a suitable controller for the
available BML:
What max. counting frequency is required of the controller?
The period of the input signal is four times the edge
distance.
The max. frequency of the input signal is then 1/(4 x edge
distance).
Example:
With an edge distance of 1 μs for the
BML-S1G0-S7ED-M5EQ-G0-S284, the max. frequency
of the input signal is 1/4 μs = 250 kHz.
The max. counter frequency for a 4x evaluation =
1/edge distance = 1/1 μs = 1 MHz.
Coding in the type code breakdown
BML-S1G0-S7E_-M5EQ-_0-S284 (example)
Resolution
For further information, see Type code
breakdown on page 34.
Min. edge distance