Mitsubishi Electric MELDAS C6 Interface Manual page 312

[Cautions]
(1) During synchronous operation or independent operation, the basic axis signals are valid for
the "Interlock" and "Machine lock" signals, etc.
(2) The synchronous axis will return to the reference position in synchronization with the basic
axis if G27, G28 or G30 is commanded during synchronous operation. If the synchronous
axis is at the reference position when the basic axis completes reference position return, the
reference position return will be completed. If the synchronous axis is not at the reference
position when the basic axis completes reference position return, the "Reference position
reached" signal for the basic axis will not be output.
(3) The position switches are processed independently for the basic axis and synchronous axis.
(4) Input the same OT signal for the basic axis and synchronous axis.
Set the same soft limit value for the basic axis and synchronous axis.
If the above settings cannot be made because of the machine specifications, observe the
following points.
• If OT or soft limit occurs during the manual operation mode, an alarm will occur only for the
synchronous axis, and the basic axis will not stop.
Thus, make sure that the basic axis alarm turns ON before the synchronous axis.
• OT during the manual operation mode will cause the synchronous axis to stop when the OT
signal for only the basic axis turns ON. The basic axis is stopped by the position controller,
and the synchronous axis is stopped by the NC control unit.
Thus, there may be a difference in the stop positions. If an excessive error alarm occurs
because of OT, enter the editing mode, and cancel the alarm.
(5) The basic axis independent operation is handled as asynchronous, so the PLC input/output
signal is not reflected on the synchronous axis.
(6) The error offset amount " ∆ " of "FB error (synchronous axis FB value, basic axis FB value, error
offset amount " ∆ ")" displayed on the screen:
The error offset amount " ∆ " is made when the operation method is changed because the R932
register is changed.
Note that if the zero point has not established, the error offset amount " ∆ " is made immediately
after the zero point is established.
[Related signals]
Synchronized correction mode (Y722)
Recalculation request (CRQ: Y72B)
6. EXPLANATION OF INTERFACE SIGNALS
6.4 PLC Output Signals (Data Type: R***)
6-4-22