Configuration
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
Baumüller Nürnberg GmbH
256
4.4
4.4.16 Measuring encoder function
The Measuring encoder function can be used to store the position actual values of En-
coder 1 to different external signals.
Different settings may be selected as trigger signals for measuring encoders. When the
trigger signal occurs, the current position actual value of the corresponding encoder will
be stored and shown in the assigned measuring encoder display parameters.
The accuracy of the measuring encoder is the accuracy of the encoder system that is
used:
m
With rectangular incremental encoders, the resolution per revolution corresponds with
the quadruple of the line number.
m
With SinCos
®
encoders and sine incremental encoders, the analog information from
the sine and cosine tracks is also evaluated.
m
Only the information from the analogous evaluation exists for tilt encoders.
The following events may trigger the storage:
m
Rising and / or falling edge at digital input TP1
m
Rising and / or falling edge at digital input TP2
m
Zero pulse of a encoder. This function is only possible with rectangular or sine incre-
mental encoders.
m
Zero pulse of a encoder in connection with an additional qualification signal (High or
Low level) at digital input TP1 or TP2.
A one-time or continuous storage is possible for each trigger event (e.g. rising edge at
digital input TP1). If a trigger should be issued for a rising or falling edge of a digital input,
a minimum edge distance of at least 4 µs must be observed due to the limitations of the
digital I/O evaluation. The minimum edge distance is extended up to 500 µs, if the filter
for suppression of bounce influences is switched on.
Only the first measurement will be displayed for single measurements ("one-time trigger-
ing"). Triggering will then be deactivated and additional trigger events will therefore be ig-
nored. The availability of the measured values will be shown in Parameter 124.3 (Status).
124.2 (Measuring Encoder ActCmd) can be used to reactivate an already configured
(124.1 Measuring Encoder ConfMode) single measurement and the existing measured
values for the applicable trigger event will thereby be deleted.
With continuous triggering, the first measurement within the sampling cycle (1 ms) is al-
ways displayed. If additional trigger events follow within the same sampling cycle, they
will be ignored. The first measurement within the next sampling cycle will overwrite the
values of the previous one. The availability of new measured values will be displayed in
parameters 124.3 (Status, after initial measurement) and 124.4 (Status 2, Toggle Bit after
each new measurement).
With triggering from a digital input, the allocation positive/negative edge is dependent on
the direction of revolution. The measured values of the positive edge at positive direction
of revolution are equal to the measured values of the negative edge at negative direction
of revolution. The measured values of the negative edge at positive direction of revolution
are equal to the measured values of the positive edge at negative direction of revolution,
and where necessary adding the measuring inaccuracy due to the encoder’s resolution.
