Machine Data For The Axis - Siemens SIMATIC FM 351 Manual

Machine Data and Incremental Dimensions
8.4

Machine Data for the Axis

Axis Data
Address Name
12.0 AXIS_TYPE
A linear axis is an axis with a limited physical travel range.
Physical start
A rotary axis is an axis whose travel range is not restricted by mechanical limit stops.
Largest displayed
value
Address Name
16.0 ENDROTAX
The value "end of rotary axis" is the highest theoretical value that the actual value can reach.
The highest theoretical value is however never displayed since it is physically the same position as the
start of the rotary axis (0).
The largest value which is displayed for a rotary axis, has the value:
End of the rotary axis [ m] – resolution [ m / pulse] . 1 [pulse]
Example: End of the rotary axis 1000 mm, resolution 1000 m/pulse
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.
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 range of the absolute encoder.
End of rotary axis[ m]
8-12
Data Initial Value
Type
DINT L#0
Start of rotary axis = end of rotary axis
Data Initial Value
Type
DINT L#100000
number of revolutions (encoder) ·
Description
Axis type:
0 = Linear axis
1 = Rotary axis
Physical end
Description
End of the rotary axis:
Range:
1 m to 1 000 000 000 m at a
resolution of 1 m/pulse
1 m to 100 000 000 m at a
resolution of < 1 m/pulse
dist[ m]
revolution
FM 351 Positioning Module
C79000-G7076-C351-02