The Linear Axis - Siemens SIMATIC S5 Manual

Machine Data and their Structure
2.5.3.2

The Linear Axis

A linear axis or open axis is an axis with a limited traversing range. The traversing range of a
linear axis is limited with the IP247 by assigning the software limit switches. This is effective only
when the reference point exists.
Digital
To the
Dower
circuitry
I
Machine
start
Fig. 2/8 Linear axis with limit switches
If permitted traversing range of a linear axis is exceeded, the equipment will almost always be
the
damaged. For this reason, particular care must be taken that the axis type and the assignment of
limit switches are correct.
Note
I
If the axis type "rotary axis" is accidentally selected instead of a linear axis, the
values assigned in the data double words DD n+29 and DD n+31 (machine
data in the CPU) will not be evaluated as limit switches. The data double words
are then only used to identify the display range for the actual value. If these
values are exceeded, the drive is not stopped.
2-12
s
braking distance
brake
Digital in-
To power
circuitry
put IP247
Machine
end