2.5.1. Auxiliary Encoder Inputs
The Auxiliary Encoder connector gives you a second encoder input channel. This channel is typically used
for dual loop applications.
Use the AuxiliaryFeedbackType [A3200: PositionFeedbackType or VelocityFeedbackType] parameter to
configure the XC4 to accept an encoder signal type.
Square Wave encoder signals:
Absolute encoder signals:
You can configure the Auxiliary Encoder interface as an output that will transmit encoder signals for
external use. Use the DriveEncoderOutputConfigureInput() function [A3200: EncoderDivider parameter]
to configure the Sine ± and Cosine ± connector pins as RS-422 outputs. You can only echo incremental
square wave primary encoder inputs. You cannot use the absolute encoder interface when you echo
incremental signals.
Table 2-35:
Auxiliary Encoder Pins on the Auxiliary I/O Connector
Pin#
Description
In/Out/Bi
1
Auxiliary Sine +
Bidirectional
Absolute Encoder Data +
Bidirectional
2
Auxiliary Sine -
Bidirectional
Absolute Encoder Data -
Bidirectional
10
Auxiliary
Bidirectional
Absolute Encoder Clock +
Output
11
Auxiliary Cosine-
Bidirectional
Absolute Encoder Clock -
Output
12
+5 Volt (500 mA max)
N/A
19
Auxiliary Marker- / PSO output
(2)
/ TTL Output
Bidirectional
20
Auxiliary / PSO output
(2)
Bidirectional
21
Common
N/A
(2) For PSO, refer to
XC4 Hardware Manual
2.5. Auxiliary I/O Connector
www.aerotech.com
67
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