Position Data, Home Position And Current Position - Mitsubishi Electric FX-1PG User Manual

Pulse generator unit
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FX-1PG/FX
-1PG PULSE GENERATOR UNIT
2N
5
5.4
Position Data, Home Position and
Current Position
• The position data includes the following:
HP: Home position, P(I): Set position (I), P(II): Set
position (II) and CP: Current position
The unit and the multiplication of each item are
described in Section 5.2.
• When the operation of returning to the machine
home position is completed, the home position HP
(BFMs #14 and #13) value is automatically written
to the current position CP (BFMs #27 and #26).
The figure below shows the CP value when the
home position HP is -100.
Speed
DOG
PG0
Machine home position
CP=0
CP=HP=–100
• The set positions P(I) and P(II) can be treated as
absolute positions (distance from the current position
CP = 0) or relative positions (travel from the current
stop position) as described later.
The current position
(CP) value increases
or decreases in
accordance with the
forward/reverse pulse.
BFM LIST
< Error in command between the machine system
of units and the combined system of units>
When the pulse rate of the BFM #0 (#2, #1) is supposed
the pulse rate as A, the feedrate as B and the relative
travel distance as C, the value "C × (A/B)" indicates the
pulse quantity which should be generated by the PGU.
Even if the value "(A/B)" is not an integer, error is not
generated in the command if the value "C × (A/B)" is an
integer.
However, if the value "C × (A/B)" is not an integer,
accumulated error is generated in the current position
when relative movement is repeated.
absolute is used for operation, an error less than 1 pulse
may be generated by counting fractions over 1/2 as one
and disregarding the rest, but accumulated error is not
generated.
When the motor system of units is used, such an
accumulated error is not generated.
When the
5-9

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