Rockwell Automation 8720MC High Performance Drives Installation Manual - Manual (Page 57)

Publication 8720MC-IN001D-EN-P — December 2002
8720MC Connector Data 2-23
Understanding 8720MC
Feedback Devices The 8720MC supports a motor feedback port, an auxiliary feedback
port (SERCOS interface only), and an A quad B motion controller
position feedback output port (analog interface only).
The table below includes the feedback devices that were tested for
compatibility with the 8720MC. There are a variety of other feedback
devices which follow standard encoder interface practices which will
interface successfully to the 8720MC. Standard A quad B differential
TTL encoders and scales, as well as 1 volt peak-to-peak scales and
encoders, are examples. Check with your local A-B technical support
personnel to assure compatibility with devices not listed.
1
The SNS Device is supported on the motor feedback port only when the 8720MC is used in analog mode.
2
The SRS and SRM are supported on the motor feedback port only when the 8720MC is used in SERCOS mode.
3
The auxiliary feedback port is only available when the 8720MC is used in SERCOS mode.
4 See the Encoder Power section for further information.
The Stegmann SNS-60 device is an incremental sine/cosine encoder
used for spindle and power servo applications where an analog
velocity command is the required motion controller interface. The
Stegmann output signals include a marker pulse. This device is
required if the 8720MC encoder output signals are interfaced with a
motion controller for position feedback.
The Stegmann SRS-660 is a single-turn feedback device used in
spindle applications, as well as power servo applications. This is only
available in the SERCOS version.
Device Vendor
Motor/Aux
3
Support
Output Type
Absolute/
Incremental
Resolution
Power
Supply
SNS
1 Stegmann
8720SM-S3, -S4
Auxiliary
Hiperface™
1Vpp Differential
Sine/Cosine
Incremental
1024 CPR
~1 Million Counts
Single Marker
7-12V 60mA
SRS
2 Stegmann
8720SM-S1
MPL
Auxiliary Hiperface
1Vpp Differential
Sine/Cosine
Single-Turn
Absolute 1024 CPR
>2 Million Counts
7-12V 130mA
SRM
2 Stegmann
8720SM -S2
MPL
Auxiliary Hiperface
1Vpp Differential
Sine/Cosine
Multi-Turn
Absolute
1024 CPR
>2 Million Counts
4096 Turns
7-12V 130mA
TTL AQB Various Auxiliary
5V Differential
TTL AQB w/ Z
Incremental Various Various
4
1Vpp Sine/Cosine Various Auxiliary
1Vpp Differential
Sine/Cosine w/ Z
Incremental Various Various
4
IMPORTANT
Auto-configuration of intelligent absolute,
high-resolution, and incremental encoders is possible
only with Allen-Bradley motors.