Siemens SIMATIC S5 Manual page 195

Fundamentals of COM 266
Data area for a linear axis:
Field name Type
Module
Meas.System O Refer to the data area on page 2
Axis type
Ref. point I The reference point coordinate must lie between the lower and upper
coordinate software limit switches or at the exact position of one of these switches.
Software lower I This value specifies the lower software limit switch. This value must be
limit lower than that for the upper software limit switch and must also be
such that the axis cannot reach the lower hardware limit switch during
deceleration.
Software upper I This value defines the coordinate of the upper software limit switch. This
limit value must be greater than that for the lower software limit switch and
must also be such that the axis cannot reach the upper hardware limit
switch during deceleration.
Tool length I This value is used to compensate for tool wear. Each target position in a
offset traversing (machining) program is offset by this value. The tool length
offset is added to any previous tool offset, and can be used repeatedly.
"Type" column: I = input field, O = output field
6-28
Description
EWA 4NEB 812 6057-02
IP 266