Balluff Ethernet/IP BTL7-V50D Series - Page 46

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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
chapter5.3.6 on page16). If 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 Attribute19: Set
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 Magnet Configuration Settings on page29).
BTL7-V50D-…
Configuration Manual