Balluff BML-S1G0 7 M5E 0 Series, Руководство пользователя

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6
Interfaces (continued)
6.2 BiSS C interface
(BML-S1G0- B …)
The BiSS 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
Name
in the
interface
document
Shown in
interface
document as
high
Physical
layer
Input
+Clk
CLK +Clk > –Clk RS422
–Clk
Output
+Data
Data +Data > –Data RS422
–Data
Tab. 6-5: In- and outputs
Resolution
[µm]
Inter-
polation
factor
Vmax
[m/s]
1)
Maximum
measuring length
[m]
32 bits
0.9765625
(1000/1024)
2048 10 48
1 2000 5 48
2 1000 10 48
5 400 10 48
10 200 10 48
1) The max. speed for a digital A/B real-time interface is also limited by
the edge separation (see Tab. 6-18 on page 24).
Tab. 6-6: Relationship between the resolution, interpolation factor,
maximum speed and meaning of the bits
Interface data and meaning of the bits
are defined in Tab. 6-7 and Tab. 6-8.
Interface data Value
Bit number after CDS 40
Maximum measuring length [m] 48
Permissible Clk frequency [kHz] 0.1…10
Tab. 6-7: Interface data
Bit names Bit number
(after CDS)
Number of
bits
Null bits (always 0) Bit 39...36 4
Position [incr]
(Bit35 (MSB), Bit8 (LSB))
Bit 35...8 28
Error (active low) Bit 7 1
Warning (active low) Bit 6 1
CRC Bit 5...0 6
Tab. 6-8: Meaning of the bits in the data set
The counter polynomial for CRC determination is
0x43 (hex), 67 (dec) or 1000011 (bin).
6.2.1 Troubleshooting
Information on errors and warnings is available. The
magnetic encoder outputs a maximum of 8 errors and
8 warnings. Regardless of the interface, the 16 messages
are displayed through different colors (LED off, red, orange)
and LED flashing sequences (see section 8 on page 29).
In the following, errors and warnings are referred to as EW
events.
If the BML detects an EW event, it makes a note of it and
transmits it with the error/warning bit once during the next
data query. At the same time, an LED flashing sequence
(see section 8 on page 29) is started. This flashing
sequence is output at least once until the data query has
taken place.
If the EW event is present for a longer period of time
across multiple data queries, the corresponding bit is set
and the LED flashing sequence output during each data
query.
If multiple EW events occur successively, the flashing
sequence changes accordingly.
6.2.2 EDS
EDS, electronic data sheet, user area:
This BiSS C function allows the customer to permanently
store and read out, byte by byte, any customer-specific
data in the EEPROM user area of the sensor head via
register communication.
User range: 448 bytes (7 banks of 64 bytes each)
BML-S1G0-_7_ _-M5E_-_0-_ _
Absolute magnetic encoder system