Siemens SIMATIC FM 452, Manual

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Machine Data and Cam Data
8-7
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
8.3 Machine Data of the Axis
Axis Data
Address Name Type Initial
Value Comment
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.
Highest displayed
value
Address Name Type Initial
Value Comment
16.0 ENDROTAX DINT L#100000 End of rotary axis:
Range:
1
m to +1 000 000 000 m
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 highest value that can be displayed by a rotary axis is as follows:
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 total number of encoder steps of the absolute encoder.
Rotary axis end[ m] number of revolutions (encoder) ·
steps(encoder)[pul]
revolution
·RES
m
pul
Example: End of rotary axis 1000 mm
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.