Lika DRAW WIRE SFA-10000 Series, User Manual, Page: 60 / 72

SFA-5000 • SFA-10000 Profibus
The reversed formula can be very useful -for instance- when you know the
maximum counting frequency that is applicable to the system (because of the
encoder, the following electronics and the cable length) and you need to
calculate the maximum rotational speed the encoder is allowed to reach at the
desired resolution.
Preset value
when any Class is set
(Master  Slave)
Byte 1 2 3 4
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
This parameter allows to set the encoder position to a Preset value. The Preset
function is meant to assign a desired value to a physical position of the encoder
(i.e. a position in the travel of the wire). 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 (i.e. the position of
the wire) in the moment when the preset value is sent. The
Preset value
value is
sent by the Master to the Slave in
Data_Exchange
mode by setting the 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
the 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 control
= DISABLED, then
the
Preset value
must be less than or equal to the
Total hardware
resolution
.
- If
Scaling function control
= ENABLED, then
the
Preset value
must be less than or equal to the
Total resolution
.
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