Interfaces; Ssi Interface; Bml-S1G0-S - Balluff BML-S1G0-7-M5E-0 Serie Manual De Instrucciones

BML-S1G0-_7_ _-M5E_-_0-_ _
Absolute Magnetically Coded Position Measuring System
6

Interfaces

6.1

SSI interface

(BML-S1G0-S...)

The SSI interface is described in the document
Interfaces for BML Magnetically Coded
Position Measuring System (Doc. No. 929191).
The document is part of this guide and must be
used.
The in- and outputs have the following data:
Signal Name in the
name 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 when a digital A/B real-time interface is used is defined by
1)
the edge separation (see Tab. 6-17 on page 20).
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
16 english
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 1 1
Bit 2...4 3
Bit 5...32 28 Bit 3...26
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 10.5 on page 30):
– 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 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 1 1 Bit 1
Bit 2 1 Bit 2
24 Bit 3...25
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 1 1
1 Bit 2 1
23 Bit 3...24 22