Beckhoff AX2000 - 14 Screen Page Encoder

14 Screen page "Encoder"
Cycle time of the encoder emulation: 0.125 µs.
Encoder emulation
ASCII: ENCMODE
Default: 1 valid for all OPMODES
Change this only while the amplifier is disabled.
ID Function Comments
0 Input
The interface is used as an input.
1 ROD
Incremental-encoder emulation. In the servo amplifier, the position of the motor
shaft is calculated from the cyclically absolute signals from the resolver or
encoder. This information is used to create incremental-encoder compatible pulses
(max. 250 kHz). Pulses are given out at the connector X5 as two signalsA/Bwith
a 90° electrical phase difference, and a zero pulse.
Exception: If an encoder with a commutation track is used as the feedback
unit, then the output of the zero pulse is inhibited (data are invalid) until the
zero pulse from the encoder has been evaluated.
2 SSI
SSI-encoder emulation. In the servo amplifier, the position of the motor shaft is
calculated from the cyclically absolute signals from the resolver or encoder. This
information is used to create a position output in a format that is compatible with
the standard SSI-absolute-encoder format. 24 bits are transmitted.
Radio button SINGLE TURN selected:
The upper 12 bits are fixed to ZERO, the lower 12 bits contain the position infor
-
mation. For 2-pole resolvers, the position value refers to the position within one
turn of the motor, for 4-pole resolvers it is within half a turn, and for 6-pole
resolvers it is within a third of a turn.
Exception: If an encoder with a commutation track is used as the feedback unit,
then the upper 12 bits are set to 1 (data invalid!) until a homing run is performed.
Radio button MULTI TURN selected:
The upper 12 bits contain the number of motor turns, the lower 12 bits contain the
position information.
3
ROD Interpo-
lation
Digitization and interpolation of the sine encoder input signals (feedback) to TTL
level incremental output. This function works properly only with sine encoder
feedback systems.
The parameter INTERPOLATION determines the multiplier for the number of lines
of the feedback encoder per electrical motor rotation.
Resolution ROD
ASCII: ENCOUT
Default: 1024 valid for all OPMODES
Determines the number of increments per turn that are output. Change this only while the amplifier is disabled.
Encoder function (ENCMODE) Feedback system Resolution Zero position
ROD (1)
Resolver 16...1024
one per revolution
(only if A=B=1)
EnDat / HIPERFACE
16...4096 and
8192...524288 (2
n
)
one per revolution
(only if A=B=1)
ROD interpolation (3)
Incremental encoders
without absolut data
channel
4...128
TTL lines per sine line
analog pass through
from X1 to X5
The resolution in the controls can be increased by quadruple evaluation of the increments.
38 Setup Software
Screen page "Encoder" 07/03 BECKHOFF