8
8-13
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
8.5 Machine Data for the Encoder
The encoder supplies the displacement information to the module which
evaluates it and converts to an actual value using the resolution.
It is only by correctly specifying the machine data of the encoder that you
can ensure that the determined actual value of the axis position matches the
real axis position.
The following table describes all the data which you can parameterize in the
Encoder dialog field on the parameterization interface.
Table 8-4 Machine Data for the Encoder
Machine Data and
Assignment
Description
Encoder type:
5 V incremental
24 V incremental
Absolute (SSI)
You will find information about the working principle of encoders
In this manual
– You will find information of a general nature about encoder systems in Chap-
ter 10 (Encoders).
– You will find special information on the connection of the encoders in Chapter
4.2 (Connecting the Encoders).
In the relevant data sheets.
Frame length
13 bit
25 bit
The machine data is only present with an absolute encoder.
With the frame length you define the behavior of the FM 351 on receiving the encoder
signal. You define the cycle frame which the FM 351 outputs.
Displacement per encoder
revolution:
1 to 1,000,000.000 mm
With the machine data “Displacement per encoder revolution” you inform the FM 351
of the distance covered by the drive system per encoder revolution.
The value Displacement per encoder revolution depends on how your axis is set up
and the position of the encoder. With this value you must take into account all trans-
mission components such as couplings or gear units (take note of the illustrations in
this table).
If you do not take into account all the transmission components, the determined resolu-
tion does not represent the resolution of the table or of the tool.
Please take note also of Chapter 8.6 (Resolution). It describes the relationship between
the machine data Displacement per encoder revolution and Increments per encoder
revolution.
Motor
Encoder
Gear unit
Motor
Encoder
Gear unit
Definition
Data List
Machine Data and Increments
To Next Page
Loading...
