Manual_PROFINET_EN.doc 20/24
www.baumer.com
17.10.11
Device-specific parameters
•
Code sequence
Behaviour of position data relating to the sense of rotation of the encoder shaft when looking at the
flange.
CW („clockwise“) = Ascending values with clockwise rotation
CCW („counter-clockwise“) = Ascending values with counter-clockwise rotation
•
Steps per turn
Parameterization of the desired singleturn resolution („steps per revolution“, „measuring units per
revolution“). Allowed parameters range from 1 to the maximum encoder resolution. The
parameterization software signals the limits.
Re-parameterization may clear the previous preset offset value (see “note” under 6.5. Preset
function) so that any current position reference will be lost.
•
Total measuring range
Parameterization of the required total measuring range, „TMR“.
With singleturn encoders it must be the same parameter as entered for the singleturn resolution
(“Measuring units per revolution“).
Admissible values range from 2 to the product of the programmed resolution multiplied by the
encoder’s maximum number of revolutions.
Any alteration of the total measuring range clears the previous preset offset value (see under 6.5
Preset Function)
Important note for multiturn encoder operation
This encoder supports „Endless Operation“ automatically if required.
Thus, there are no special requirements for the encoder parameters “total measuring range” and
“measuring units per revolution” to stand in a certain ratio.
With endless operation active, the encoder shaft must not rotate when the encoder is not
powered.
In those cases where powerless motion cannot be avoided, the encoder has to be
referenced (presetted) after each power-up. With Endless Operation inactive, the encoder shaft may
rotate unlimited when encoder not powered.
How to determine if „Endless Operation“ is in use:
•
Multiply the encoder’s „max. possible revolutions“ (depending on encoder 16 bit = 65536 or 13 bit
= 8192) by your chosen parameter „measuring units per revolution“.
•
Divide this value by your chosen „total measuring range“.
•
If there is a division remainder, endless operation is in use.
Example for parameters without endless operation:
Maximum possible revolutions
65536
(16 bit multiturn)
Measuring units per revolution
3600
Total measuring range
29.491.200
(8192 x 3600)
Calculation:
65536 x 3600 / 29.491.200 = 8 (no remainder)
Example for parameters with endless operation:
Maximum possible revolutions
65536
(16 bit multiturn)
Measuring units per revolution
3600
Total measuring range
100.000
Calculation:
65536 x 3600 / 100.000 = 2359 remainder 29600
