
4.REFERENCE POSITION ESTABLISHMENT B-63323EN-1/03
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- Requirements when this function is used with synchronization control axes
When this function is used with synchronization control axes, the
distance coded linear scale used for the master axis and that used for
the slave axis must have reference marks placed at identical intervals.
(Set identical values in parameter Nos. 1896 and 5226 for both the
master and slave axes.)
This function does not work unless the use of this function is specified
for both the master and slave axes (bit 7 (DCL) of parameter No. 1008
is 1).
Also, in all parameters related to this function, except parameter No.
5227 (distance from the scale zero point to reference position), set
identical values for both the master and slave axes.
If a parameter value for the master axis differs from the corresponding
parameter value for the slave axis, alarm SV0051 is issued.
NOTE
1 When this function is used with synchronization control
axes for which the operation mode is switched between
synchronization operation and normal operation, this
function is enabled only if the synchronization select
signal (SYNC1, SYNC2, ...) is 1. (During establishment
of a reference position, the synchronization select
signal status must be maintained.)
2 This function is disabled if the master or slave axis
satisfies one of the following conditions:
- Zero is set in parameter No.1896 (mark-1 interval) or
parameter No. 5226 (mark-2 interval).
- The value set in parameter No.1896 is greater than or
equal to the value set in parameter No. 5226.
- The value set in parameter No. 5226 is at least twice
as large as the value set in parameter No. 1896.
- An absolute-position detector is used.
- Reference position establishment with synchronization control axes
With synchronization control axes, a reference position is established
as follows. When a reference mark for the master or slave axis is
detected, a stop takes place temporarily. Then, a feed operation is
performed again at the reference position return FL feedrate. This
sequence is repeated until a reference mark is detected three or four
times for both the master and slave axes. Then the absolute position is
calculated for both the master and slave axes, and the reference
position establish signals (ZRF1, ZRF2, ...) are set to 1.
After the reference position has been established by the above
operation, a synchronization error is corrected. (Checking for
excessive synchronization error alarm 2 is made even during reference
position establishment.)