11
4.2.2
Resolution
The resolution of the sensor is the value of one raw count (see section 3.4). Match the entered
resolution with the resolution of the SSI or CANbus sensor as programmed at the factory. If the sensor
resolution is given in different units than you wish to use for display, it is possible to change the units
temporarily while entering the resolution – this can be helpful when entering a resolution in mm but
displaying position in inches. The default resolution is 0.005 mm (0.000197 inches).
4.2.3
Scale
The position data from the sensor is multiplied by the scale before it is used (see section 3.4). This
feature can be used to display position in units that are not natively supported by the TDD2, such as feet or
meters. The default scale is 1.0.
4.2.4
Hard Offset
The hard offset is subtracted from the position before it is displayed (see section 3.4). This value
can be used to correct a constant error in position or to “zero” the display. To “zero” the display manually,
set the offset to 0.0, move the magnet to the desired zero location, and set the offset to the position
displayed at that point. The same display zeroing effect can be achieved directly from the front panel (see
section 4.8). The default offset is 0.0 units.
4.2.5
Soft Offset
An additional offset is subtracted from the position before it is displayed (see section 3.4). This
value is never saved to the EEPROM. It is intended to allow the operator to zero the display without
removing an offset that is preconfigured.
4.2.6
Direction Sense
Position information from the transducer is treated as increasing from zero if the direction sense is
positive. If the direction sense is negative, position information from the transducer is treated as decreasing
from zero. More information on how the direction sense mathematically effects the displayed position can
be found in section 3.4.
For example, with a positive direction sense, a raw position of 5000 counts read from the
transducer is interpreted as +5000; with a negative direction sense it is interpreted as –5000.
Combining a negative direction sense and an offset allows the operator to reverse the physical
locations of the smallest and largest positions. For example, if the maximum position output from the
transducer is 20.0 inches, setting the offset to –20.0 inches and the direction sense to negative will cause the
display to read 20.0 inches where it initially read 0.0 inches, and to decrease to 0.0 inches at the point where
it initially read 20.0 inches.
The default direction sense is positive.
4.2.7
Display Mode
The display mode controls what position is displayed. The simplest and default display mode is
single mode. In single mode, the position of a specific magnet with respect to the head of the transducer is
shown. The other two display modes, Gap and Relative, display the position between two magnets.
In Single mode, the position of the displayed magnet is displayed.
Gap mode displays the distance between to adjacent magnets, selected with the
displayed gap
configuration value. Gap 1 shows the distance from magnet 1 to magnet 2. Gap 2 shows the distance from
magnet 2 to magnet 3.
Relative mode displays the distance between two magnets, the
displayed magnet
and the
reference
magnet
.
See section 3.4 for information on how the displayed position is calculated.
4.2.8
Displayed Magnet
When the display mode is set to single, the position of the displayed magnet is shown. If the
display mode is set to relative, the position of the reference magnet is subtracted from the displayed magnet.
