Datalogic AMT58 Series Manual page 95

AMT58x-PB Profibus®
6.6 DDLM_Data_Exchange
This is the normal operational status of the system. The Slave (no
matter if set to Class 1 or Class 2) can both transmit the
value to the Master and receive the
Position
(Encoder  Master)
Byte
Bit
Data 2
This is the position information output by the encoder. The value is
right aligned in the data field.
Preset
(Master  Slave)
Byte
Bit
Data 2
The Preset function is meant to assign a desired value to a physical
position of the encoder. The chosen physical position will get the
value set next to this item and all the previous and following positions
will get a value according to it. This function is useful, for example,
when the zero position of the encoder and the zero position of the
axis need to match. The preset value will be set for the position of the
encoder in the moment when the preset value is sent. The
value is sent by the Master to the Slave in
setting bit 31 = "1" for 3 cycles.
The MSB of the preset value controls the preset function in the
following way:
Normal operating mode: MSB = 0 (bit 31): the encoder will make no
change in preset value.
Preset mode: MSB = 1 (bit 31): with the MSB = 1 the encoder
accepts the transferred value (bits 0 ... 30) as a preset value in binary
code.
- If Scaling function
Presetmust be less than the Hardware total resolution.
- If Scaling function
Preset must be less than the
38
Preset
1 2
31-24 23-16
31 24 23 16
to 2 2 to 2
1 2
31-24 23-16
31 24 23 16
to 2 2 to 2
= DISABLED, then
= ENABLED, then
Total resolution
value from the Master.
3 4
15-8 7-0
15 8 7 0
2 to 2 2 to 2
3 4
15-8 7-0
15 8 7 0
2 to 2 2 to 2
Data_Exchange mode by
Position
Preset