Control Techniques Epsilon EP-I Reference Manual page 26

Epsilon EP-I Indexing Drive and FM-2 Indexing Module Reference Manual
Following Error
The Following Error is the difference (in user units) between the Position Command and the Position Feedback. It is positive
when the Position Command is greater than the Position Feedback.
Encoder Position
The motor position in encoder counts since power up when the value was set to zero. This is a signed 32 bit value. This is set
to zero when the Absolute Position Valid output function is activated.
Pulse Input Posn
This parameter returns the total number of actual pulses received on the pulse input hardware. This value is active in all
operating modes.
16