How Indexes Work - Emerson Control Techniques FM-4 Reference Manual

Programming module
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Figure 19:
Home Sensor and Marker then Offset, Example
When the device sees the rising edge of the Home Initiate function, it accelerates the motor to the Home Velocity. The motor
continues at that velocity until it first senses the Home Sensor input. The motor continues on at the home velocity until the
marker is activated.
The rising edge of the motor's encoder marker channel is used to establish the reference position.
After sensing the rising edge of the motor's marker channel, the device will continue moving and will decelerate to a stop at
the specified offset position.
Figure 20:
Home Velocity Profile

How Indexes Work

An index is a complete motion sequence that moves the motor a specific incremental distance or to an absolute position. This
motion sequence includes an acceleration ramp to a programmed velocity, a run at velocity, and a deceleration ramp to a stop.
Figure 21:
Index Motion Sequence
Velocity
Run at Velocity
Acceleration
Operational Overview
Deceleration
Time
13

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