Emerson Control Techniques Epsilon Eb Series Reference Manual page 182

Encoder Electrical Interfacing
Each of the encoder signals is received by a differential receiver to minimize the noise
susceptibility and to increase frequency bandwidth. This requires two wires for each logical
signal. (i.e., signal A requires channel A and A/, etc.).
For optimum performance these signals should be generated by an encoder with a line driver
output. Encoders which supply only single ended output signals will require some interfacing
circuitry.
Figure 119: User Defined Motor Differential Feedback Connections
Note
The maximum current available out of the drive encoder +5 volt supply connection is 250
mA.
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User Defined Motors
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