Baumer GXP8W - Manual (Page 9)

Manual_GXP8W_EN.doc 9/13 Baumer IVO GmbH & Co. KG
04.05.11 Villingen-Schwenningen, Germany
8. Encoder Position-Object
The Encoder Position Object is a manufacturer-specific object with class code 2Fh.
Entity attributes
Due to their different functionality, entity attributes are broken down into two groups.
The first group, attribute 1 to 12 comprises the parameters for position calculating.
The second group, attribute 90 to 95 comprises the diagnostic functions.
Altered parameters are not stored in the non-volatile memory until by service “save”.
Chart: Parameters for position calculating
Attribute -
ID Access Name Data type Significance Values
1 read Number of attributes USINT Number of attributes supported
2 read Attributes Array of
USINT
List of attributes supported
3 read/
write
Sense of rotation BOOL Setting the sense of rotation 0 = CW
1 = CCW
4 read Internal diagnostic
function
BOOL Not used 0 = OFF
5 read Scaling function BOOL Scaling function active 1 = ON
6 read Position format USINT Position value format 0 = steps
7 read/ write Steps per revolution UDINT Number of desired steps per
revolution see
operating
parameter
8 read/ write Total resolution UDINT Number of desired steps
exceeding the measurement
range see
operating
parameter
9 read Reserved UDINT reserved = 0
10 read/ write Preset value UDINT Position value is set to the preset
value see
operating
parameter
11 read/ write COS-Delta DINT Minimum divergent value of the
position in COS mode 1 to total
resolution
12 read Position value DINT actual position value 1 to total
resolution
Steps per revolution
The parameter „steps per revolution“ defines the number of steps per revolution. Upon setting this parameter,
the total resolution will change correspondingly according the following formula:
Total resolution = steps per revolution x revolutions
Sense of rotation
The sense of rotation defines whether the position values are increasing with clockwise rotation (CW) or
counterclockwise rotation (CCW) of the shaft.
Total resolution in steps
The parameter „total resolution in steps“ defines the total number of steps covering the complete
measurement range.
Example: steps per revolution = 3600; revolutions = 256; Æ total resolution = 3600 x 256 = 921600
If the number of revolutions relating to a value is programmed unequal 2
n (1, 2, 4,...65536), the encoder must
be parameterized anew after crossing the encoder zero point in powerless state.