BEI Sensors PHU9 Absolute Hollow Shaft Encoder - Manual (Page 15)

PROFIBUS USER MANUAL
Preliminary 15
BEI IDEACOD SAS
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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
slave
1 0 Transfer of the required position value (= preset value)
Slave
slaver
0 0 New = required position value is transferred
Master
slave
0 0 Reset bit 31 – normal mode
Slave
Master
0 0 New = required position value is transferred
If high precision is required the preset function
should only be executed if the encoder shaft is
not moving. If the shaft moves quickly during
the preset procedure, this can result in offsets
(because of bus delay times).
Note for Singleturn devices
The procedure is similar with the singleturn-
version: Here Bit 15 is used to activate the
preset value. With high resolution singleturn
encoders (16 Bit) it is not possible to set preset
values > 32767 (15 bit), as the MSB is used to
activate the preset. If this functionality is
needed the user has to choose one of the
manufacturer specific BEI IDEACOD-encoder
versions (in these classes the singleturn position
is transmitted as 32-bit-value).