Siemens SIMATIC S7-300 Manual page 236

Description of Functions
The table below gives you an overview of the data used in this calculation
and their meaning. You will find the machine data (MD) assignments under
"Function parameters".
Sym-
If unusual numbers of pulses or steps result, the encoder with the next-higher
number of pulses or steps should be selected.
9-60
bol
I Increments per encoder rotation (incremental encoder)
G
S Number of steps per encoder revolution (absolute encoder)
G
Distance per spindle or rotary table revolution [mm/rev], [inches/rev], [degrees/
S
rev]
Required resolution [mm], [inches], [degrees]
A
4 Pulse multiplication (constant)
i Ratio between encoder and mechanism -
GS
Number of encoder revolutions
number of encoder revs
spindle revolution
Significance
number of encoder revs
or
or rotary table revs
FM 354 Servo Drive Positioning Module