Siemens SIMATIC S5 Manual page 77

IP 266
Pulses per encoder revolution
The "pulses per encoder revolution" can be found in the data sheet for your
encoder.
Resolution
The resolution is the quotient of "travel per encoder revolution" and "pulses per
encoder revolution", and must be in the range 0.1 to 99.9.
The following units must be taken into account when computing the resolution.
Travel per encoder revolution
Resolution
Use the following formula to compute the
resolution:
Special characteristics of the rotary axis:
To enable reproducibility of the reference point when using a rotary axis, the
ratio between the full machining range and the distance travelled by the drive
during one encoder revolution must be an integer number.
Rotary table
Gear
Encoder
Motor
EWA 4NEB 812 6057-02
Machine Data, Modes and Traversing Programs
µm 0.0001 inch
[ / ] [ /
pul pul
µm 0.0001 inch
[ / ] [ /
pul pul
Example:
Traversing range: 0° to 360°
During one encoder revolution, the rotary table revolves
20°.
The ratio of these two values must be an integer number.
360°
= 18
20°
0.001 deg
] [ / ]
pul
0.001 deg
] [ / ]
pul
Travel per encoder revolution
A =
Pulses per encoder revolution
5-5