
1.AXIS CONTROL B-63943EN-1/02
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1.4.5 Temporary Absolute Coordinate Setting
Overview
In the full closed system with an inner absolute position pulse coder
(serial pulse coder) and an incremental scale, the position is set by
using absolute position data from the inner absolute position pulse
coder at the power on sequence. After that, the position is controlled
with incremental data from the incremental scale. The position just
after power on sequence is rough, and the manual reference position
return is required to get the accurate position.
With this function, the position at the power on is rough, but the
following functions are available before the reference position return.
- Stroke limit check
- Position switch
Please be careful this function does not make an incremental scale
work as an absolute position detector.
The temporary absolute coordinate setting is an optional function.
In using the absolute position detector by inductosyn of the axis, this
function is not available.
Also in using the linear-scale with distance-coded reference
marks(serial), these function are not available.
Absolute Serial
Pulse Coder
Incremental
Scale
General position control
Absolute position detection
at power on
CNC
Fig. 1.4.5 (a) The system with the Temporary Absolute Coordinate Setting
In using the temporary absolute coordinate, the coordinate is same as
the reference position return has not been performed.
The reference position return is required to get the accurate position
after the power on sequence.
The reference position establishment signal (F120) are not set to "1"
until the manual reference point return is performed.
The diagnosis No.304 (reference counter value) are also not displayed
until the manual reference point return is performed.