Emerson FM-3 - Manual (Page 63)

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Setting Up Parameters
Distance Units Decimal Places parameter on the Setup\User Units View in the PowerTools
Pro software.
If an absolute index is used with a non-zero rotary rollover point, the FM-3 module will
calculate the shortest path to its destination and move in the required direction.
To force the motor to run a certain direction, use the Rotary Plus or Rotary Minus type of
indexes.
Online Tab (not shown)
While online, the following real-time data will be displayed.
Motor Position Group
Position Command
This is the commanded position in user units generated by the FM-3 module.
Position Feedback
This is the feedback position of the motor in user units.
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.