Position Measuring System - Siemens Sinumerik 840D Series Function Manual

4 Firmware Drive Functions

4.10 Position measuring system

4.10 Position measuring system
Description
Suitable
measuring
systems
Incremental
encoder
Absolute encoder
EnDat
SSI absolute value
1)
encoder
1) SSI encoders are likely to have lower noise immunity due to the encoder and the 24 V power supply. The immunity to
interference can be improved as follows: By using a separate and immune 24V power supply for the measuring sys-
tems
4-140
One measuring system can be connected per axis as a piston rod position sen-
sor.
S
Incremental encoder with sinusoidal-cosine voltage signals
S
Absolute measuring systems with EnDat interface and sinusoidal-cosine
voltage signals
S
Absolute measuring systems with SSI interface
Linear and rotary measuring systems with two 1 Vpp sinusoidal voltage signals
in quadrature. The internal interpolation factor of the HLA module is 2048 (high
resolution per sine period).
The sign of the actual-value sensing circuit can be reserved.
Signs are reversed by a software function.
Linear and rotary measuring systems with two 1 Vpp sinusoidal voltage signals
in quadrature. The internal interpolation factor of the HLA module is 2048 (high
resolution per sine period).
The sign of the actual-value sensing circuit can be reserved.
Signs are reversed by a software function.
An additional serial interface for transmitting the absolute position according to
the EnDat protocol.
Linear and rotary measuring systems with serial interface for transmitting the
absolute position using the SSI protocol.
The connection for measuring systems with a 24V voltage supply must be
made using signal lead 6FX8002-2CC80-1jjj via which the 24V DC en-
coder power supply can be fed in. The filter module 6SN1161-1DA00-0AA0
must be used in combination with this lead. No other type of filter may be used.
Encoders supplied by other manufacturers must be connected via adapter
leads supplied by the relevant manufacturer.
Encoders from the following manufacturers may be used, for example:
MTS: Temposonics 25-bit
Balluff Micropulse 25-bit
Visolux: EDM
Notice
The products recommended above are not manufactured by Siemens, but we
know that they are suitable for the purpose in principle. However, we can never
guarantee the quality of products supplied by other manufacturers.
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
 Siemens AG, 2003. All rights reserved
10.03