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Control Commands
optoNCDT ILR 1183
8.
Control Commands
8.1
Modes
The various measuring modes are distinguished by the algorithms they use for calculation. The sensor relies
on the phase comparison method for normal operation. In order to obtain a precise measured value, the user
should perform an appropriate number of single distance shots at different frequencies of a fixed number.
For the DW mode and the DX mode, the number of frequencies and/or the number of single distance shots
is limited, which allows for higher measurement frequencies. On the other hand, this also places tighter de-
mands on the quality of operating conditions, for example, targets should be strongly reflecting. The resulting
limitations should be taken into account by the user in practical work.
In DT mode or DM mode, the user may define his/her own limits for the maximum time which measurement is
to last, by setting appropriate measuring time values by use of the parameter Measuring Time.
8.1.1
DM - Single Distance Measurement
In the DM mode, a single distance shot is triggered. A desired Measuring Time can be set in the Master’s
configuring tool, using the Encoder profile and Class 2 encoder functionality.
8.1.2
DT - Distance Tracking
The DT mode adjusted ex factory can be chosen for distance measurement of different kinds of surfaces
(varying reflectance). This may cause longer measuring times in the case of poor reflectance or sudden
jumps in distance.
The minimum measuring time is 160 msec, the maximum time is 6 sec. On expiry of six seconds, measure-
ment will be aborted with an error message. A desired Measuring Time can be set in the Master’s configu-
rating tool, using the Encoder profile and Class 2 encoder functionality.
8.1.3
DW - Distance Tracking With White Target (10 Hz)
The DW mode uses a steady measuring rate of 10 Hz. A white target board is a necessary prerequisite for
measured values to be stable. There must be no sharp jumps in distance above a value of 16 cm within the
area being measured.
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