8
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• 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
9
TURCK
RM-89
Programmable Parameters
The following parameters are available on all RM-89 resolvers for DeviceNet . Note that most of these parameter names are
pulled from the ODVA (CIP) specification . They are generic, and sometimes confusing, but they are what is defined in the
specification . TURCK has decided to adopt these parameter names for all RM-89s to avoid additional translations between
protocols with one exception . In the ODVA specification, the parameter that sets the number of counts per turn of the shaft is
called the ‘Measurement Units per Span’ . This generic name can be applied to both rotary and linear resolvers . Being that the
RM-89 is a rotary resolver, this manual refers to the parameter as Counts per Turn .
Direction Counting Toggle
This parameter allows you to set the direction of shaft rotation needed to produce increasing counts .
•A value of “0” sets the direction of increasing counts to clockwise when looking at the shaft . This is the
factory default value
•A value of “1” sets the direction of increasing counts to counter-clockwise when looking at the shaft
Effects of Reversing Count Direction
Changing the Direction Counting Toggle parameter changes the way the position value is calculated . When you reverse
the count direction, the position changes from your current position value to (Maximum number of counts – current posi-
tion value) . For example, assume a 28 bit RM-89 with its default of 65,536 counts per turn . If the current position value is
100,000 and you change the Direction Counting Toggle parameter, the current position will change to 268,435,456 - 100,000
= 268,335,456 . Most applications do not require you to change the count direction after the machine is setup, so the count
direction is typically set before the position value is preset .
Changing the count direction on your machine while maintaining the current position value is a three step process . First, read
and store the current position value from the RM-89 . Second, change the Direction Counting Toggle value . Third, write the
stored position value back to the RM-89 as a preset value .
Scaling Function Control
This parameter determines if the position value reported in the network data is scaled to engineering units or if it is reported
at its full 16 bit resolution . Scaling is accomplished with the Counts Per Turn parameter . (see below)
•A value of “0” disables scaling and the position data is reported at 16 bit resolution .
•A value of “1” enables scaling and the position data is reported in the engineering units set by the Counts per
Turn parameter .
Note:
Velocity data can be reported as pulses/second, pulses/millisecond, pulses/minute, or RPM . When reported as pulses/
second, pulses/millisecond, or pulses/minute, the velocity data is always scaled by the Counts per Turn parameter . This is
useful in applications where you require the full position resolution, but want to scale velocity data to an engineering value
such as inches/second, or boxes/minute .
Содержание DeviceNet RM-89
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