Emerson FM-3 - Manual (Page 172)

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FM-3 Programming Module Reference Manual
Home Offset Type
Home.#.OffsetType
Selects calculated or specified home offset. Calculated offset is the distance traveled during
the deceleration ramp from the home velocity. The specified offset allows the user to choose
an exact offset from the Home Reference.
If On Sensor
Home.#.OnSensorAction
If the home sensor input is active when the home is initiated, this parameter determines the
direction of motion. Two selections are possible. If "Back off before homing" is selected, the
motor will turn in the opposite direction of the home until the home sensor is clear and then
begin the home. If "Go forward to next sensor" is selected, the motor will turn in the
commanded direction until the next rising edge of the sensor is seen. If using Modbus to view
or modify this parameter, 1= Back off before homing, 0 = Go forward to next sensor.
Home Reference
Home.#.Reference
This parameter determines how the reference position is determined. The parameter can have
one of three different values: 'Sensor', 'Marker', 'Sensor then Marker'. When the home
reference is 'Sensor' the rising edge of the 'Home Sensor' input function is used to establish
the reference position. When the home reference is 'Marker' the rising edge of the motor
encoder's marker channel is used to establish the reference position. When the home reference
is 'Sensor then Marker' the reference position is established using the first marker rising edge
after the Home Sensor input function goes active.
Sensor Trigger
Home.#.SensorTrigger
This destination is usually a sensor input used as a reference for the home. This event is only
used if the home is defined by sensor or by sensor and marker.
Specified Offset
Home.#.SpecifiedOffset
The specified offset parameter allows the user to specify an exact offset relative to the Home
Reference. The commanded motion will stop at exactly the offset distance away from the
sensor or the marker as specified.