Basic Characteristics RAPID

extjoint Position of external joints
Description
Components
Extjoint is used to define the axis positions of external axes, positioners or workpiece
manipulators.
The robot can control up to six external axes in addition to its six internal axes, i.e. a
total of twelve axes. The six external axes are logically denoted: a, b, c, d, e, f. Each
such logical axis can be connected to a physical axis and, in this case, the connection
is defined in the system parameters.
Data of the type extjoint is used to hold position values for each of the logical axes a - f.
For each logical axis connected to a physical axis, the position is defined as follows:
- For rotating axes – the position is defined as the rotation in degrees from the
calibration position.
- For linear axes – the position is defined as the distance in mm from the calibration
position.
If a logical axis is not connected to a physical one, the value 9E9 is used as a position
value, indicating that the axis is not connected. At the time of execution, the position
data of each axis is checked and it is checked whether or not the corresponding axis is
connected. If the stored position value does not comply with the actual axis connection,
the following applies:
- If the position is not defined in the position data (value is 9E9), the value will
be ignored if the axis is connected and not activated. But if the axis is activated,
it will result in an error.
- If the position is defined in the position data, although the axis is not connected,
the value will be ignored.
If an external axis offset is used (instruction EOffsOn or EOffsSet), the positions are
specified in the ExtOffs coordinate system.
eax_a (external axis a) Data type: num
The position of the external logical axis “a”, expressed in degrees or mm
(depending on the type of axis).
eax_b (external axis b) Data type: num
The position of the external logical axis “b”, expressed in degrees or mm
(depending on the type of axis).
RAPID Reference Manual 7-extjoint-1