Delta RMC101 - Manual (Page 616)

RMC100 and RMCWin User Manual
6-72
The number of counts at the starting and ending positions are 300,000 and 400,000. However,
because there will be no controlling taking place before 300,000 counts, we can immediately subtract
300,000 counts from the position and act as though the counts received are 0 through 100,000.
Therefore, the position units are between 0 and 50,000, which fits within the 16-bit, 65,535 limit.
The above example should describe the need for this field. This field is used in steps of 256
counts. That is, you may subtract off counts of 0, 256, 512, etc., but not values in between. This is
not a significant limitation because precise scaling and offsetting can be done through the Scale
and Offset axis parameters.
To calculate your desired Count Offset, do the following:
1. Determine the absolute-minimum count value you will control.
2. Divide this count by 256.
3. Discard the fractional portion.
4. Enter this value into the Count Offset field.
In the example above, the following values would be used.
1. The absolute-minimum count value to be controlled is 300,000.
2. Dividing 300,000 by 256 yields 1171.875
3. Discarding the fractional portion of 1171.875 yields 1171.
4. Entering 1171 in Count Offset results in a value of 299,776 being used as the actual Count
Offset.
Configuring Balluff SSI Transducers
As of this printing, Balluff has two generations of transducers that support SSI: BTL-3 and BTL-5.
The part numbers both begin with the format of BTLa-S1bc… (e.g. BTL3-S102), where the lower-
case letters are described below.
Note: It is highly recommended that a Synchronized transducer be selected for motion control.
BTL5s can be purchased as synchronous by specifying a B in the part number. For example,
BTL5-SxxxB-Mxxx-x-xxxx.
a: Generation
3 = Generation 3
5 = Generation 5
This setting does not affect the configuration of the RMC.
b: Code Format
0 = Binary increasing (24 bits)
1 = Gray Code increasing (24 bits)
2 = Binary decreasing (24 bits)