Interfaces; Ssi Interface (Bml-S1G0-S - Balluff BML-S1G0 Série Notice D'utilisation

BML-S1G0-_7_ _-M5EG-_0-_ _
Absolute magnetic encoder system
6

Interfaces

6.1 SSI interface
(BML-S1G0-S...)
The SSI interface is described in the document
Interfaces for BML Magnetic Encoder System.
The document is part of this guide and must be
used.
The in- and outputs have the following data:
Signal Name in
name the
interface
document
+Clk
Input CLK
–Clk
+Data
Output Data
–Data
Tab. 6-1: In- and outputs
Resolution Interpolation
[µm] factor
0.9765625 2048
(1000/1024)
1 2000
2 1000
5 400
10 200
The max. speed for a digital A/B real-time interface is also limited by the
1)
edge separation.
Tab. 6-2: Relationship between the resolution, interpolation factor,
maximum speed and meaning of the bits
Permissible Clk frequency [kHz]
Tab. 6-3: Permissible clock frequency
Bit names
Error (active high)
Null bit (always 0)
Position bits, MSB is sent first
Tab. 6-4: Meaning of the bits in the data set
www.balluff.com
Shown in Physical
interface layer
document as
high
+Clk > –Clk RS422
+Data > –Data RS422
Vmax
[m/s]
1)
32 bits
10 48
5 48
10 48
10 48
10 48
32 bits
70...1300
32 bits
Bit Number
number of bits number
Bit 31 1
Bit 30...28 3
Bits 27...0 28 Bits 23...0
Data formats
The sensor head has the following factory default settings
for position output which can only be changed using the
BML Configuration Tool (see section 10.6 on page 32):
– BML-S1G0-S...: 24, 25, 26, 32 bits
The above bits include the error and null bits.
– Binary or Gray coded
– Rising or falling
The relationship between the resolution, interpolation
factor, maximum speed and meaning of the bits for the
various configurations is defined in Tab. 6-2 and Tab. 6-4.
Maximum measuring length [m]
26 bits 25 bits
8
8
16
40
48
26 bits 25 bits
70...700 70...700
26 bits 25 bits
Bit Number Bit
of bits number
Bit 25 1 Bit 24
Bit 24 1 Bit 23
24 Bits 22...0
24 bits
4 2
4 2
8 4
20 10
40 20
24 bits
70...700
24 bits
Number Bit Number
of bits number of bits
1 Bit 23 1
1 Bit 22 1
23 Bits 21...0 22
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