UK
Inclination sensor JN
13
Index Sub-
index
Type
Value
Content
Read /
Write
Length
byte
4105
0
UINT8
Zero x / y / z axis
status
1
→
Zero active
(relative measurement)
2
→
Zero inactive
(absolute measurement)
R
1
10 Angle calculation (ISDU index 4100)
To be able to adapt the inclination sensor to the different applications as easily
as possible, the measured inclination information is converted into different angle
indications. The requested angle indication is set by selecting the respective
option.
With this angle definition a sensor coordinate system is used which is defined as
follows:
– The mounting plane corresponds to the xy plane.
– The z axis is perpendicular to the mounting plane (according to the right-
hand rule).
– The x axis is represented by an edge of the mounting plate which shows in
direction of the printed x arrow.
– The y axis is then perpendicular to the plane spanned by the z and x axes.
10.1 Perpendicular angle (ISDU index 4100 = 0)
Using the indication of the two perpendicular angles the inclination of the sensor
coordinate system towards the direction of gravitation is described.
The first provided value corresponds to a rotation about the y axis of the sensor
and is called "longitudinal inclination value" (index 40, process data PDVal1).
The value corresponds to the angle [°] which the gravitation vector spans with the
yz plane.
The second provided value corresponds to a rotation about the x axis of the
sensor and is called "lateral inclination value" (index 40, process data PDVal2).
The value corresponds to the angle [°] between the gravitation vector and the xz
plane of the sensor.
In the case of an inclination in a plane (rotation of an axis with the second axis remaining
perpendicular) the perpendicular angle and gimbal angle are always identical.