Festo SFC-DC series, Manual

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1. System summary
1−12
Festo P.BE−SFC−DC−IO−EN en 0801a
1.1.3 Reference coordinates and working area
The measuring reference system of the SFC−DC is based on
the axis zero point which is defined via the offset to the refer
ence point.
The position of the reference point is defined during the ref
erence run. The referencing method defines the way in which
the axis determines the reference point.
When the reference travel is finished, the drive stands at the
axis zero point.
Reference point REF forms the mechanical reference point of the axis coordinate
system and is defined by reference travel with a reference
switch or a fixed stop, depending on the referencing method.
It is the reference point of the axis zero point.
Axis zero point AZ is shifted by a defined distance from the reference point (axis
zero point offset) and is the reference point of the software
end positions and the project zero point. By defining the axis
zero point and the software end positions you can limit the
working area of the linear axis to the permitted range (work
ing stroke).
Project zero point PZ is a reference point within the working stroke which the user
can select and to which both the actual position and the
target positions in the position set table refer. The axis zero
point is the reference point for the project zero point.
The project zero point is specified for the SFC−DC with I/O
interface, and is identical to the axis zero point (project zero
point offset = 0).