Printed in the Federal Republic of Germany
TR-Electronic GmbH 2004, All Rights Reserved
10/01/2014
TR - ECE - BA - DGB - 00036 - 10
Page 97 of 115
8.11.7.2 Total measuring range
Defines the
total number of steps
of the measuring system before the measuring
system restarts at zero.
Lower limit
16 steps
Upper limit PNO CLASS 2 16 bit
65 536 steps
Upper limit PNO CLASS 2 32 bit
33 554 432 steps (25 bit)
Default
16 777 216
The actual upper limit for the measurement length to be entered in steps is dependent
on the measuring system version and can be calculated with the formula below. As
the value "0" is already counted as a step, the end value = measurement length in
steps - 1.
Total measuring range = Steps per revolution * Number of revolutions
To calculate, the parameters
steps/rev.
and
the number of revolutions
can be read
on the measuring system nameplate.
When entering parameter data, ensure that the parameters
"Total measuring
range"
and
"Steps per revolution"
are selected such that the quotient of the two
parameters is an exponent of 2.
If this is not the case, the measuring system corrects the measurement length in
steps to the next smallest exponent of 2 revolutions. The Steps per revolution
remains constant.
The newly calculated total measuring range can be read from the extended diagnosis
information for CLASS 2 and is always shorter than the specified measurement
length. It may therefore occur that the total number of steps actually required is not
achieved and the measuring system generates a zero transition before it reaches the
maximum mechanical distance.
As the internal absolute position (before scaling and zero point adjustment) is
periodically repeated after 4096 revolutions - for applications where the number of
revolutions is not an exponent of 2 and rotation is infinitely in the same direction,
there is always an offset.
For such applications, one of the TR configurations
"TR-
Mode…"
are always to be
used.
