Siemens SINUMERIK 840D Description Of Functions page 169

11.03
3.11 Encoder mounting arrangements
2-encoder system With this type of system, two separate encoders are used to supply the actual
values for one axis. In standard applications, the drive evaluates the motor
encoder and the NC, for example, the measuring system connected to the 2nd
actual value input. The 611digital control module transfers the two actual values
to the NCK and drive via two separate actual value channels.
Connection
of motor
encoder
(IMS)
Connection
of direct
position
encoder
(DMS)
FDD
Fig. 3-40 2-encoder system for a feed drive
Connection
of motor
encoder
(IMS)
Connection
of direct
position
encoder
(DMS)
MSD
Fig. 3-41 2-encoder system for a main spindle drive
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Note
For a 1-encoder system a direct position encoder (DMS) cannot be used for
the measuring system of another axis.
Encoder
Gearbox
Motor
(FDD)
Incremental
encoder
Motor
(MSD)
3 Safety-Related Functions
Machine table
Linear scale
Back-
lash
Shift gearbox
Spindle
Incremental
encoder
GEBER_01.DSF
GEBER_03.DSF
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