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BFD 3SAP-19N000-U01-LA2-C_ _ _ _ _
Ultrasonic sensors
5
Primary Device Functions (continued)
MDC Descriptor
The MDC Descriptor contains information about the
current value range of the measurement value
(Measurement Value) within the limits of the measurement
range (Measurement Range), about the unit and the
scaling of the measurement value. The values for the lower
measurement limit (Lower Limit) and upper measurement
limit (Upper Limit) specify the value range.
The Scale parameter in the MDC Descriptor is a signed
8 bit number. The scaling indicates the exponents of a
power of ten of the measurement value relative to the base
unit. The basic unit is coded by the parameter Unit Code in
the MDC Descriptor. The possible unit values of the sensor
include:
Unit
Meter
Tab. 5-19: Possible unit values of sensor
On delivery, the lower measurement value limit has its
origin at value 0. If an offset is set, the value of the lower
measurement value limit changes according to the
Measurement Offset.
Hide Limited Accuracy Areas
Outside of the measurement range, measurement values
are still output. These do not conform to the limits
specified in the data sheet.
The output of the non-linear areas (Limited Accuracy
Areas) can be configured. If the output is deactivated, the
sensor outputs either Out Of Range Plus or Out Of Range
Minus if the measurement range is exited.
Value
Meaning
0x00 (0)
Visible
0xFF (255)
Hidden
Tab. 5-20: Measurement profiles – Hide Limited Accuracy Areas
Measurement Offset
The Measurement Offset is subtracted from the current
measurement value. This parameter can be reset using
Application Reset and Factory Reset.
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Measurement Preset
Measurement Preset can be used to calculate a
Measurement Offset. Measurement Preset specifies a
target value that should be achieved after a Teach Preset
by the current measurement value. Following a successful
Teach Preset, the current measurement value has the
same value as Measurement Preset.
This parameter can be reset using Application Reset and
Factory Reset.
Measurement Output Characteristics
The Measurement Output Characteristics parameter
defines the output characteristic, which can be rising or
falling. This setting affects the offset setting. It is possible
that the offset setting needs to be performed again after
Value
this setting is changed.
This parameter can be reset using Application Reset and
1010
Factory Reset.
Value
0x00 (0)
0xFF (255)
Tab. 5-21: Measurement profiles – Measurement Output
Measurement Hysteresis
The hysteresis of the measurement value can be set with
parameter Measurement Hysteresis. This parameter is
used to dampen unstable measurement values.
This parameter can be reset using Application Reset and
Factory Reset.
Measurement Range
With Measurement Range, the measuring range can be
changed by teaching with the Teach Lower Limit and
Teach Upper Limit System Commands or by overwriting
the parameter.
This parameter Measurement Range can be reset using
Application Reset and Factory Reset.
Meaning
Falling
Rising
Characteristics
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