Danaher Motion Standalone MMC, Hardware Manual

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82 Standalone MMC Hardware Manual
Standalone MMC Control
version 15.1
Danaher Motion
4.6.2.4 Aux I/O Port Encoder Input
The Aux I/O Port provides an input for a differential incremental encoder. This encoder
is typically used as a digitizing (read only) axis. This axis then acts as a “master” axis,
and the other servo axis are “slaved” to its position. The Aux I/O Port encoder input
accepts RS422 differential inputs. The encoder signals should be quadrature type. All
encoder wiring between the MMC and the drive should be shielded twisted pair as
shown in
Figure 4-20 .
For more information on the Encoder input operation, refer to Section A.4 on page 175
of Appendix A .
Figure 4-20: Aux Port MMC Encoder Input
NOTE
The power supply that powers the encoder must be referenced to the power
supply that powers the MMC. This is done by connecting the “common” ter-
minal of each supply back to Single Point Ground. Failure to observe this pre-
caution may result in sporadic encoder operation and/or damage to the MMC.
A
A/
I
B
I/
B/
A
A/
B
B/
I
I/
MMC Aux I/O Connector
Drive
1
2
3
4
5
6
Shielded
Twisted
Pairs