BEI Sensors MHK5 Absolute Hollow Shaft Encoder - Manual (Page 20)

5.1.4 Activate commissioning mode
Bit 2 in octet 26 activates the commissioning
mode. This is a special mode with the option to set
further parameters in the data-exchange –mode
(additional to the preset value). In the
commissioning mode a „Teach-In“ can be carried
out, i.e. the gearing factor can be determined
directly in the machine. In this special mode
(indicated by the flashing green LED) the
parameters set in the system configuration are
ignored by the encoder. It uses parameters stored
in an internal EEPROM instead. The commissioning mode can be used durably, but
it is recommended to transfer the parameters
determined with the Teach-In into the system
configuration. Then the encoder should be used in
“normal” operation mode – so it is possible to
exchange the device without a new Teach-In.
A detailed description of the commissioning mode
can be found in section 5.3.
Octet 26 Bit 2 Commissioning mode
0 Switched off
1 Switched on
5.1.5 Shorter Diagnostics
Some Profibus masters, especially older ones,
have problems with the full diagnostic data length
(57 bytes). The encoder offers the option to
reduce the diagnostic data length to 16 bytes. If
Class 1 is used the standard diagnostic data length
is 16 bytes.
Octet 26 Bit 3 Diagnostics
0 Standard = 57 bytes
1 Reduced = 16 bytes
5.1.6 Software-limit switch
Two positions can be programmed. If the position
value falls below the lower limit switch or exceeds
the higher limit switch, bit 27 in the 32-Bit-process-
value is set to 1. Between these limit switches bit
27 is set to 0. The limit switches can be set to any
value, but the parameter “total measuring range” must not be exceeded. The limit switches are
activated with bits 5 and 6 in octet 26.
Note: With many software tools it is necessary to
divide the values into high and low word, refer to
page 35.
Octet 27 28 29 30
Bit 31 - 24 23 - 16 15 – 8 7 - 0
Data 2 31 to 2 24 2 23 to 2 16 2 15 to 2 8 2 7 to 2 0
Lower limit switch (in measuring steps, related to the scaled value)
Page 20 BEI Sensors Profibus Manual serie M Revision 03/10