Siemens SIMOTION C230-2 Equipment Manual page 18

The Fundamentals of Motion Control
C230-2
DAC
+
Position
controller
–
Fig. 2-2 Servo system with converter, e.g. SIMODRIVE 611 universal, with encoder emulation
Encoder emulation
Modern motor/converter systems often have a high-resolution motor measuring
system (rotor position encoder) connected at the converter. Here the converter
provides the position information via an interface that emulates an incremental en-
coder (e.g. incremental shaft encoder (WSG) interface with SIMODRIVE). A sepa-
rate position measuring system is not required in this case.
Position-controlled motion control for servo axes (PROFIBUS DP)
The C230-2 allows the position-controlled motion of axes via PROFIBUS DP.
The following PROFIBUS protocol is used for specifying the speed setpoint and
feeding back the actual position value:
PROFIdrive profile drive technology, Version 3 (isochronous)
C230-2
+ Position
controller
–
Fig. 2-3 Servo system with converter, e.g. SIMODRIVE 611 universal
2-18
Converter
Power section
Speed setpoint
X2
Current controller
Speed controller
Enable
Actual position
X3
value, zero mark
X4
WSG
X5
X6
X1
Converter
Speed setpoint
PROFIBUS DP
X9 Power section
Current controller
Actual position value
Speed controller
X2
X3
X4
X5
X6
X1
Servo motor
Encoder
M
3
Rotor position
Servo motor
M
3
Actual speed value
Actual position value, zero mark
E Siemens AG, 2003 All rights reserved
SIMOTION C230-2, 04.2003 Edition
Encoder