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9
Programable Parameters (continued)
Counts per Turn
(ODVA: Measuring Units Per Span)
Used to scale the position and/or velocity data from the RM-89 .
•Values can range from 2 to 65,536 counts per turn for single turn RM-89 units .
•Values can range from 1 to 65,536 counts per turn for multi-turn RM-89 units .
Position data is only scaled if the Scaling Function Control parameter equals “1” . Velocity data is always scaled .
The number of turns encoded by the RM-89 is not controlled with this parameter . The Total Measurement Range parameter is
used to control when the position data rolls over to zero, which controls the number of turns encoded by the RM-89 .
Total Measurement Range
The Total Measurement Range parameter sets the total number of counts before the position value returns to zero . It is
always used when determining the position value . If the Total Measurement Range parameter is left at its default value of
zero, the roll over position is determined by the Counts per Turn parameter and the number of turns the RM-89 can encode . If
the Total Measurement Range is non-zero, it places an upper limit on the position value and the Preset Value parameter . The
Total Measurement Range parameter has the following ranges:
•
Single Turn RM-89:
Range of 0, 2 to 65,536
•
28 bit Multi-turn RM-89:
Range of 0, 2 to 268,435,455
Note that the value of the Counts per Turn parameter does not limit the range of values the can be programmed into the Total
Measurement Range parameter . There is no fixed relationship between the Total Measurement Range and Counts per Turn
parameters, which leads to interesting applications that use the two parameters .
Roll Over on Fractional Number of Turns
When the Total Measurement Range is less than the total counts available from the RM-89, the position will return to zero
before the full mechanical travel is completed .
•When the Scaling Function Control parameter is disabled, the total counts available equals 65,536 multiplied by the
number of turns the RM-89 can encode .
•When the Scaling Function Control parameter is enabled, the total counts available equals the value of the Counts
per Turn parameter multiplied by the number of turns the RM-89 can encode .
Summary of Contents for DeviceNet RM-89
Page 1: ...USER MANUAL MA1007 REV B Published 4 15 2015 RM 89 DeviceNet Resolver...
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Page 38: ...38 www turck com 1 800 544 7769 Fax 763 553 0708 TURCK Minneapolis MN 55441 TURCK RM 89 Notes...
