# “Displacement” Function Block

Calculates the displacements of a measuring point with respect to the reference measurement.

Application example: monitoring structures.

#### Input channels

Name

Explanation

Unit

Measurement point Y

Measurement point for which the displacements should be calculated

m

Measurement point X

m

Measurement point Z

m

Reference point Y

Optional reference point to validate the input values from the measurement point

m

Reference point X

m

Reference point Z

m

#### Parameters

Name

Explanation

Unit

Phi

Azimut, that is the longitudinal axis angle of the structure being monitored with respect to the north direction of the coordinate system in which measurements were made. With this angle, the displacement vector can be split into parts parallel to the axes (longitudinal and lateral) and thus output. Phi = 0 means that the longitudinal axis of the structure to be monitored is parallel to the north direction of the coordinate system.

gon

Maximum allowed differences to the reference point / Lateral

Maximum allowed absolute difference between 'Lateral displacement' from the measurement point and from the reference point.
If the value is 0, the input data is not validated.

mm

Maximum allowed differences to reference point / Longitudinal

Maximum allowed absolute difference between 'Longitudinal displacement' from the measurement point and from the reference point.
If the value is 0, the input data is not validated.

mm

Maximum allowed differences to reference point / Vertical

Maximum allowed absolute difference between 'Vertical displacement' from the measurement point and from the reference point.

If the value is 0, the input data is not validated.

mm

Maximum allowed differences to reference point / Horizontal value

Maximum allowed absolute difference between 'Horizontal displacement value' from the measurement point and from the reference point.
If the value is 0, the input data is not validated.

mm

Maximum allowed absolute differences to reference point / Total value

Maximum allowed absolute difference between 'Total displacement value' from the measurement point and from the reference point.
If the value is 0, the input data is not validated.

mm

#### Output channels

Name

Explanation

Unit

Lateral displacement

Displacement from reference point of the lateral part of the vector rotated by Phi

mm

Longitudinal displacement

Displacement from reference point of the longitudinal part of the vector rotated by Phi

mm

Height displacement

Displacement from height reference point (Phi has no influence here)

mm

Horizontal displacement value

Horizontal value of displacement vector (Phi has no influence here)

mm

Azimut displacement

Horizontal angle of displacement vector (Phi has no influence here)

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Total displacement value

Total value of displacement vector (Phi has no influence here)

mm

#### Optional validation of input data

If a parameter in the "Maximum allowed differences to the reference point" is greater than 0, the input values are validated against the given reference point.

For this purpose, the displacements of the measuring point and the displacements of the reference point are calculated in each case. Then the absolute differences are determined and compared with the limit values in the parameters.

If the difference is too large, the input values are discarded as invalid and the output values are assigned the error code 3050.

This allows false measurements to be identified and false alerts due to incorrectly measured points can be avoided.

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