Siemens S7-300 - 8.3 SM 326; DI 24 x DC 24 V

Machine and cam data
9.7 Machine data of the axis
FM 352 electronic cam controller
76 Operating Instructions, 05/2011, A5E01071724-03
End of rotary axis
Address Name Type Start value Comment
16.0 ENDROTAX DINT L#100000 End of rotary axis
Range: 1 µm to +1 000 000 000 µm
The "end of rotary axis" value is theoretically the highest actual value of the axis. However, the
theoretical maximum value is never indicated, because it also represents the physical start position of
the rotary axis (= zero).
The highest rotary axis value displayed is:
End of rotary axis [µm] - resolution [µm / pulse] x 1 [pulse]
Example: End of rotary axis = 1000 mm
The displayed value jumps:
 from 999 mm to 0 mm, at a positive rotational direction.
 from 0 mm to 999 mm, at a negative rotational direction.
Rotary axis with absolute encoders
The rotary range (0 to end of rotary axis) of an axis with an absolute encoder must correspond
exactly to the total number of encoder steps.
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Reference point coordinate
Address Name Type Start value Comment
44.0 REFPT DINT L#0 Reference point coordinate
Range:
- 1 000 000 000 µm to
+ 1 000 000 000 µm
Incremental encoder and initiator
Using the "Retrigger reference point" function switch and a synchronization event defined by the
"Type of reference point retriggering", the reference point coordinate is assigned to this event.
Absolute encoder (SSI)
An assigned axis with an absolute encoder is always synchronized, provided no error is detected
(after transmission of the first error-free SSI frame).
For more information, refer to the absolute encoder adjustment description (see chapter "Determining
the correct abs
olute encoder adjustment (Page 82
)"), which explains the interaction of the absolute
encoder adjustment with the other data.
Linear axis
The value of the reference point coordinate must always lie within the working range (including the
software limit switch start and end).
Rotary axis
The value of the reference point coordinate must be greater than or equal to 0 and less than the "end
of rotary axis" value (0 ≤ reference point coordinate < "End of rotary axis").