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BECKHOFF
8.11
Feedback
Every closed servo system will normally require at least one feedback device for sending actual
values from the motor to the servo drive. Depending on the type of feedback device used, informa-
tion will be fed back to the servo amplifier using digital or analog means.
AX2040/2070 supports the most common types of feedback device whose functions must be assig-
ned with the parameters
in the setup software. Scaling and other settings must always be made here.
Configuration
One Feedback
Two Feedbacks
For a detailed description of the ASCII parameters, please refer to the online help of the setup soft-
ware.
The table below provides an overview of the supported feedback types, their corresponding para-
meters and a reference to the relevant connection diagram in each case. On each of these, the pin
assignment shown on the encoder side relates to the BECKHOFF motors.
Primary feedback type
Resolver
SinCos Encoder BISS
SinCos Encoder ENDAT
SinCos Encoder HIPERFACE
SinCos Encoder w/o data channel
SinCos Encoder + Hall
RS422 5V + Hall
RS422 5V
Sensorless (w/o feedback)
* Can only be set on the terminal screen of the setup software
** RS422 means "incremental encoder AquadB".
Hints for combining primary with secondary feedback systems for position
control/electr. gearing can be found from page 56.
AX2040/2070 Product Manual
FBTYPE
(screen page FEEDBACK), primary Feedback
EXTPOS
(screen page POSITION), secondary Feedback
GEARMODE
(screen page GEARING), secondary Feedback
Location
motor
motor
externally
06/2007
Commu-
ASCII Parameter
tation
FBTYPE
X
FBTYPE
X
EXTPOS
GEARMODE
Wiring
Connector
diagram
ð p.50
X2
ð p.51
X1
ð p.52
X1
ð p.52
X1
ð p.53
X1
ð p.54
X1
ð p.54
X1
ð p.55
X5
-
Electrical Installation
Speed
Position-
control
control
X
X
X
X
FBTYPE
0, 3
20*
3, 4
2, 3
6, 7 (16*)
11*
12*
8*, 9*
-
10*
electr.
gearing
X
49
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