Siemens SINUMERIK 840D Description Of Functions

11.03 3 Safety-Related Functions
3.11 Encoder mounting arrangements
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-169
Note
For a 1-encoder system a direct position encoder (DMS) cannot be used for
the measuring system of another axis.
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.
Encoder
Gearbox
Back-
lash
Linear scale
GEBER_03.DSF
Connection
of direct
position
encoder
(DMS)
Connection
of motor
encoder
(IMS)
Motor
(FDD)
Machine table
FDD
Fig. 3-40 2-encoder system for a feed drive
Shift gearbox
GEBER_01.DSF
Incremental
encoder
Spindle
Connection
of direct
position
encoder
(DMS)
Connection
of motor
encoder
(IMS)
Motor
(MSD)
Incremental
encoder
MSD
Fig. 3-41 2-encoder system for a main spindle drive
2-encoder system

Siemens SINUMERIK 840D Specifications

General

Series	SINUMERIK 840D
Axes	Up to 31
Channels	Up to 10
Operating System	Windows-based
Power Supply	24 V DC
Control Unit Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
Interpolation	Spline
PLC	Integrated PLC
Data Storage	CompactFlash, USB