BEI Sensors MHK5 Absolute Hollow Shaft Encoder - Manual (Page 25)

5.3.2 Teach-In Start
After the machine / system has been moved to the
start-position the Teach-In-Start command is transmitted to the encoder. The device now starts
the internal calculation of a new scaling factor.
Status bits Data bits
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Master →
MHM5
0 1 0 0 0 0 0 Start the Teach-In by setting bit 30 to 1
MHM5 →
Master
0 1 0 X X 0 1 Acknowledgement of the encoder by setting bit 30 to 1
Master →
MHM5
0 0 0 0 0 0 0 Reset bit 30
MHM5 →
Master
0 1 0 X X 0 1 Non-calculated position value is transmitted (gearing factor = 1, no offset)
Note: The scaling factor is set to 1; the zero point
shift is set to zero.
5.3.3 Teach-In Stop
After moving the machine / system to the stop-
position the Teach-In-Stop command is send.
Together with this command the desired number of
steps over the moved measuring range is
transmitted. The user has to observe that the
physical resolution is not exceeded (e.g. 20000
steps on a quarter of a revolution). Positive and
negative directions are taken into account
automatically, also the crossing of the physical
zero point. Note: The measuring range must not
exceed the half physical measuring range of the
encoder (i.e. a maximum of 2047 revolutions for a multiturn device with 4096 revolutions and a
maximum of 8181 revolutions for the 14-Bit-
multiturn).
After receiving the Teach-In-Stop command the
encoder transmits the calculated total resolution.
This value should be noted and later (when
switching the device to normal mode) entered into
the parameter settings.
After this Teach-In procedure the encoder operates
with the new gearing factor (which is stored non-
volatile in the internal EEPROM).
Status bits Data bits
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Master →
MHM5
0 0 1 0 0 0 0 Number of desired measuring steps (on the traversed measuring range)
MHM5 →
Master
0 1 1 X X 0 1 Transfer of the total resolution (should be noted)
Master →
MHM5
0 0 0 0 0 0 0 Reset bit 29
MHM5 →
Master
0 0 0 X X 0 1 Output of the current position value, scaled with the new gearing factor
Revision 03/10 BEI Sensors Profibus Manual serie M Page 25