10
www.turck.com
• 1-800-544-7769 • Fax:
(763)
553-0708 • TURCK
• Minneapolis,
MN
55441
www.turck.com
• 1-800-544-7769
• Fax: (763) 553-0708
• TURCK • Minneapolis, MN 55441
11
TURCK
RM-89
Programmable Parameters (continued)
Total Measurement Range (continued)
Figure 1 .3 shows what occurs when the Total Measurement Range parameter is used to divide the full range of travel of the
RM-89 into equal parts . In this case, a twenty-eight bit RM-89 has its 4,096 turns evenly divided into five cycles of 819 .2 turns .
Note:
If the value of {Total Counts ÷ Total Measurement Range} is an integer, the RM-89 remains an absolute rotary sensor . You
can remove power from the RM-89, rotate it as far as you want, re-apply power, and the RM-89 will give you the correct
position value . Figure 1 .3 is an example of this setup because the division of the two parameters results in the quotient
value of five .
Figure 1 .4 shows a single turn RM-89 where the Total Measurement Range parameter is not used to divide the full range of
travel into equal parts . In this case, the position value will roll over to zero after 225 degrees of rotation .
In this example, the value of {Total Counts ÷ Total Measurement Range} is a real number, 1 .6, instead of an integer .
Note:
When the {Total Counts ÷ Total Measurement Range} quotient is a real number, the RM-89 will power up with the correct
position value as long as the shaft is rotated less than half of the complete span of the resolver while power was removed .
In practical terms:
•
RM-89 multi-turn resolvers:
If you remove power from the sensor and rotate the shaft such
that the point that you stop at is less than 2,048 turns from the point where you removed power, the
position reading will be correct when you re-apply power .
•
RM-89 single turn resolvers:
If you remove power from the sensor and rotate the shaft such
that the point that you stop at is less than 180 degrees from the point where you removed power, the
position reading will be correct when you re-apply power .
Note:
If the point that you re-apply power at is greater than the limits listed above, the position value from the
RM-89 will be off by at least ±1 turn .
Figure 1 .3 Fractional Turn Example 1
Figure 1 .4 Fractional Turn Example 2
28 bit RM-89: 4096 Turns
Counts per Turn = 1,000 Counts
Total Counts = 4,096, 000
Total Measurement Range = 819,200 Counts
RM-89 outputs five cycles of counts from 0 to 819,199 over 4,096 turns
0
0
0
0
0
0
One Rotation of a Single Turn RM-89
Counts per Turn = 36,000 counts
Total Measurement Range = 22,500 Counts
RM-89 outputs one cycle of counts from 0 to 22,499 for every 225 degrees of rotation.
0
0
0
0
0
Summary of Contents for DeviceNet RM-89
Page 1: ...USER MANUAL MA1007 REV B Published 4 15 2015 RM 89 DeviceNet Resolver...
Page 14: ...14 www turck com 1 800 544 7769 Fax 763 553 0708 TURCK Minneapolis MN 55441 TURCK RM 89 Notes...
Page 38: ...38 www turck com 1 800 544 7769 Fax 763 553 0708 TURCK Minneapolis MN 55441 TURCK RM 89 Notes...
