Baumer G1-G2-GB-GXxxx - Manual (Page 33)

Manual_ProGeber_V1-40_EN.doc 33/40 Baumer IVO GmbH & Co. KG
10.05.11 Villingen-Schwenningen, Germany
1. How to check if there was any rounding:
Final position/ (steps/turn) = Number of turns, whole number
⇒
No rounding error
Number of turns, no whole number ⇒
Rounding error
2. Real value of steps/turn:
Final position /Value of turns as a whole number = real number
3. How to calculate the rounding difference:
Real value less automatically calculcated value = rounding difference
4. Divergence of requested start count:
Rounding difference multiplied by number of turns completed = divergence in steps
5. How to calculate the rounding error:
Rounding difference/ automatically calculated value = relative error in %
Example:
Desired resolution range is from 0 to 1100
Automatically calculated value is 18 steps/turn
1. Check whether there was any rounding:
Final position/(steps/turn) = 1100/18 = 61,11 (Value has been rounded)
2. Real value of steps/turn =1100/61 = 18,032
3. Rounding difference =18,032 – 18 = 0,032
4. Divergence after 61 turns = 0,032 X 61 = 2 steps
5. rounding error = 0,032/18 = 0,177 %
The range begins with start count 2 instead of zero whereas the final value remains at 1100.
By the function „set position“ the value zero can be re-assigned to the start count. As a
consequence, the final value is shifted by 2 steps to 1098.
Important:
All SSI encoders with software version 2C and up allow re-assignment of zero to the start
count both for positive and negative shiftings. With all other SSI as well as parallel encoders
the assignment of zero to the start count is possible for positive shiftings only.