Machine Data and Incremental Dimensions
8-12
FM 351 Positioning Module
C79000-G7076-C351-02
8.4 Machine Data for the Axis
Axis Data
Address Name Data
Type
Initial Value Description
12.0 AXIS_TYPE DINT L#0 Axis type:
0 = Linear axis
1 = Rotary axis
A linear axis is an axis with a limited physical travel range.
Physical start Physical end
Start of rotary axis = end of rotary axis
A rotary axis is an axis whose travel range is not restricted by mechanical limit stops.
Largest displayed
value
Address Name Data
Type
Initial Value Description
16.0 ENDROTAX DINT L#100000 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
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]
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] number of revolutions (encoder) ·
dist[m]
revolution
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.
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