Datalogic AMT58*-PN Series Instruction Manual page 66

AMT58x-PN ProfiNET®
Bit 12 Bit 11 Action
0 X Normal operating mode.
The encoder will make no change in the output
value.
1 0 Preset mode absolute
The encoder reads the current position value and
calculates an internal offset value from the preset
value P65000 –Preset value and the read position
value. The position value is then shifted with the
calculated offset value to get the current position
value equal to the preset value. The encoder
acknowledges the preset by setting the bit 12
Set/shift of home position executed in the sensor
status word G1_ZSW. Now bit 12 Request
set/shift of home position in the sensor 1 control
word G1_STW can be set to zero by the Master.
The encoder will end the preset cycle
by clearing the bit 12 Set/shift of home position
executed in the sensor status word G1_ZSW.The
new internal offset value can be read with an
acyclic data exchange parameter (if implemented)
and is securely stored in case of voltage breakdown
and uploaded again at each power on.
1 1 Preset mode relative (offset)
The encoder uses the preset value P65000 –
Preset value as a relative offset value. In this mode
the current position value is shifted by the value
deriving from the preset value.
So a "real" position value of "5000" will have the
value "6000" after the relative shifting sequence.
The encoder will set bit 12 Set/shift of home
position executed in the sensor status word
G1_ZSW to acknowledge the execution of the
shifting. Bit 12 Request set/shift of home position
in the sensor control word G1_STW can now be set
to zero by the Master. The encoder will end the
preset cycle by clearing the bit 12 Set/shift of
home position executed in the sensor status word
G1_ZSW.The internal offset value will be shifted
according to the transferred preset value. The new
offset value is securely stored in case of voltage
breakdown and uploaded again at each power on.
The Preset command automatically saves the calculated internal
offset values.
50
EXAMPLE
A preset value "1000" is intended to
shift the current position value by 1000
steps in the positive counting direction.