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Attribute 14:
Scaling function (
Scaling Function Control
)
This attribute is set to TRUE (On) in the delivery status. This
means that the position values are scaled according to
attributes 15 and 16. If this attribute is set to FALSE (Off),
the scaling function is deactivated and the raw value as
well as all other parameters relating to the position are
output in raw format (Counts). This function is for
troubleshooting and calibration.
This parameter has the same function as the entry
Scaling_function_Control
in the
Config-Assembly
(see
Config_assemby_
parameter_recognition
is activated, the settings in the
Config-Assembly
are decisive and attribute 14 is ignored.
Attribute 15:
Position units (
Position Format
)
Attributes 10 (
Position Value Signed
), 19 (
Preset Value
)
and 51 (
Offset Value
) as well as the position value output in
I/O Assembly Object
are influenced by this attribute. Input
and output of these attributes is always in the currently
selected
Position Format
. The above-mentioned attributes
are saved with an accuracy of 1 μm and converted into the
selected position format during input or output. This
means that the entered positions are not influenced by a
change in position format – and also not the accuracy with
which they are set. Example: An offset that has been
determined in the micrometer (μm) settings still retains its
accuracy if the setting is switched to millimeters (mm).
In order to rule out any unwanted rounding errors, the
respective attributes should either be set again or checked
after a change to the
Position Format
.
The nanometer unit is less than the
measurement resolution. The smallest
increment here is 1000.
Possible units are listed in Tab. 5-1.
Designation
Abbre-
via tion
Identifi cation
(Dec.)
Identifi cation
(Hex.)
Counts
4097
0x1001
Centimeters
cm
8706
0x2202
Millimeters
mm
8707
0x2203
Micrometer
(Micron)
μm
8708
0x2204
Nanometer
nm
8709
0x2205
Inch
In
8711
0x2207
Tab. 5-1: Position units
5
Configuration and parameterization (continued)
Attribute 18:
Increment (
Position Measuring Increment
)
This sets the smallest increment in which position changes
are detected. This parameter depends on attribute 15
(
Position Format
). Attribute 15 should therefore be set first.
The entry
Position_Measuring_Increment
in the
Config-
Assembly
(see chapter 5.3.7 on page 16) has the same
function. If
Config_assemby_parameter_recognition
is
activated, the settings in the
Config-Assembly
are decisive
and attribute 18 is ignored.
Attribute 19:
Set position offset (
Preset Value
)
The current position value can be assigned a required
position value using this attribute. The following takes
place if attribute 19 is set:
1. Attribute 19 is set to the entered value depending on
the
Position Format
.
2.
Offset Value
(attribute 51) is set to the difference
between
Preset Value
and the current position value.
3. The output position value (attribute 10) is calculated as
follows during further operation:
Output position value = internal position value + Offset
Value (attribute 51)
The entered value relates to the setting of
attribute 15
Position Format
. Therefore set
attribute 15 before attribute 19.
The value found in
Preset Value
(attribute 19) is irrelevant
for further operation once it has been set. The attribute
Offset Value
(attribute 51) remains constant and
determines the output position value from now on.
Attribute 51 cannot be directly set, but only indirectly via
attribute 19.
It should prevent the combination of position
units and offset from causing an overrun.
Attribute 51:
Offset (
Offset Value
)
As described in the previous section
position offset (Preset Value)
, the offset value cannot be
directly set, but only indirectly using a preset. Direct access
to the offset value is only possible via the web server
(see 7.2.3
BTL7-V50D-…
Configuration Manual
Summary of Contents for Ethernet/IP BTL7-V50D Series
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