2 supported diagnostic messages, 1 extended diagnostics header, 2 memory error – BEI Sensors MHK5 Absolute Hollow Shaft Encoder User Manual
Page 28: 3 operating status, 4 encoder type, 5 singleturn resolution, 6 number of revolutions, 7 operating time warning, 8 profile version, 9 software version
6.2 Supported diagnostic messages
In the following the different diagnostic messages
are described in detail.
6.2.1 Extended diagnostics header
Byte 7 contains the length of the extended
diagnostics (including header itself).
6.2.2 Memory error
Bit 4 in diagnostic byte 8 is used to indicate a
memory error.
Memory error means that the internal EEPROM of
the encoder no longer works correctly and that it
cannot be guaranteed that values (e.g. offset
value) are stored non-volatile.
Bit Definition
0
1
4 Memory
error
(defective EEPROM)
No Yes
6.2.3 Operating status
Diagnostic byte 9 contains certain parameters (set
in the system configuration).
Bit Definition
0
1
0
Direction of rotation
CW
CCW
1
Class 2 functionality
Off
On
2 Diagnostic
routine
Off On
3 Scaling
function
Off On
6.2.4 Encoder type
Diagnostic byte 10 contains the encoder version
(singleturn or multiturn).
Byte 10
Definition
0 Singleturn
encoder
1 Multiturn
encoder
6.2.5 Singleturn resolution
Diagnostic bytes 11-14 contain the real (physical)
resolution per revolution of the encoder.
6.2.6 Number of revolutions
Diagnostic bytes 15 and 16 contain the real
(physical) number of revolutions of the encoder.
Standard values are 1 for singeturn and 4096
(resp. 16384) for multiturn devices.
6.2.7 Operating time warning
Bit 4 in diagnostic byte 21 indicates an operating
time warning. The bit is set after 10
5
hours.
6.2.8 Profile version
Diagnostic bytes 24 and 25 contain the profile
version of the encoder.
Byte 24
25
Bit
15 – 8
7 – 0
Data 2
7
- 2
0
2
7
- 2
0
Revision
No.
Index
6.2.9 Software version
Diagnostic bytes 26 and 27 contain the software
version of the encoder.
Octet 26
27
Bit
15 – 8
7 - 0
Data 2
7
to 2
0
2
7
to 2
0
Revision No.
Index
6.2.10 Operating time
The operating time of the encoder can be read out
from diagnostic bytes 28 to 31. If the encoder is
connected to the power supply the operating time
is stored in an EEPROM every six minutes in 0.1 h
steps.
Page 28
BEI Sensors Profibus Manual serie M
Revision 03/10