BEI Sensors PHU9 Absolute Hollow Shaft Encoder - Manual (Page 19)

PROFIBUS USER MANUAL
Preliminary 19
BEI IDEACOD SAS
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Web : www.bei-ideacod.com
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 BEI IDEACOD 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 34.
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)