Siemens SIMATIC FM 351 - Machine Data for the Axis

8
8-7
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
8.3 Machine Data for the Axis
The axis has the input ranges:
 Axis type
 Entries for the reference point on the axis
 Axis limits
The description of all data for the axis input range can be found in Table 8-3.
Table 8-3 Machine Data for the Axis
Machine Data and
Assignment
Description
Axis type:
 Linear axis
 Rotary axis
The linear axis is an axis which has a physically limited travel range.
Physical start Physical end
The rotary axis is an axis for which the travel range is not limited by mechanical
end-stops.
Start of rotary axis = End of rotary axisLargest displayed value
End of rotaty axis:
0.001 mm
to
+1,000,000.000 mm
The value, End of rotary axis, is theoretically the largest value which the actual value
can attain.
The theoretically highest value (in the example below: 1000 mm) is however never
displayed, because it physically labels the same position as the start of the rotary axis
(0).
The display jumps:
 With a positive direction of rotation from 999 mm to 0 mm.
 With a negative direction of rotation from 0 mm to 999 mm.
The largest value which is displayed for a rotary axis, has the value:
End of rotary axis [m] - Resolution [m/increment]⋅ 1 [Increment]
Rotary axis with absolute encoders
With a rotary axis with an absolute encoder the rotary axis range (0 to End of rotary
axis) must exactly cover the total number of encoder steps.
End of rotary axis 8 Number of revolutions ·
Steps
Revs.
·
1
RESOL
ƪ
m
incr
ƫ
Definition
Data List
Machine Data and Increments