Chapter
3
Operating Instructions
AFS60/AFM60 EtherNet/IP
12
Product description
3.2.2
Round axis functionality
The encoder supports the function for round axes. During this process, the steps per revo-
lution are set as a fraction (see section 3.5.9 on page 36). As a result, the total resolution
does not have to be configured to 2
H
times the steps per revolution and can also be a
decimal number (e.g. 12.5)
The output position value is adjusted with the zero point correction, the counting direction
set and the gearbox parameters entered.
Example:
A rotary table for a filling system is to be controlled. The steps per revolution are pre-
defined by the number of filling stations. There are nine filling stations. For the precise
measurement of the distance between two filling stations, 1000 steps are required.
The number of revolutions is pre-defined by the transmission ratio = 12.5 of the rotary
table gearing.
The total resolution is then 9 × 1000 = 9000 steps, to be realized in 12.5 revolutions of
the encoder. This ratio cannot be realized via the steps per revolution and the total reso-
lution, as the total resolution is not 2
H
times the steps per revolution.
The application problem can be solved using the round axis functionality. Here the steps
per revolution are ignored. The total resolution as well as the nominator and divisor for the
number of revolutions are configured.
9000 steps are configured as the total resolution.
For the nominator for the number of revolutions 125 is configured, 10 as the divisor
(
125
/
10
= 12.5).
After 12.5 revolutions (that is after one complete revolution of the rotary table) the
encoder reaches the total resolution of 9000.
Note
Fig. 1: Example round axis
functionality for position
measurement on a rotary
table
125
10
Rotary table with
nine filling stations
Encoder
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8018909/1EH9/2021-12-16
Subject to change without notice
