
B–61404E/08
21. SIMPLE SYNCHRONOUS CONTROLPROGRAMMING
367
CAUTION
1 When the automatic reference position return command (G28) and the 2nd/3rd/4th reference
position return command (G30) are issued during synchronous operation, the V axis follows
the same movement as the Y axis returns to the reference position. If the V axis is positioned
at the reference position after the return movement is complete, the reference position return
complete signal of the V axis goes on when that of the Y axis goes on.
As a rule, commands G28 and G30 must be issued in the normal operating mode.
2 The machine must be manually returned to the reference position in the normal operating
mode.
3 Both the pitch error and backlash are compensated independently for the master axis and the
slave axis.
4 Turn on the manual absolute switch (ABS = 1) during synchronous operation. If it is off, the
slave axis may not move correctly.
5 When the machine is manually returned to the reference position during synchronous
operation, both the master axis and the slave axis move synchronously until the acceleration
movement is complete. However, grid detection thereafter is carried out independently.
6 The operation can be switched between synchronous operation and normal operation by using
a signal input from the PMC.
NOTE
1 When the automatic reference position return check command (G27) is issued during
synchronous operation, the V axis and Y axis move in tandem. If both the Y axis and the V axis
have reached their respective reference positions after the movement is complete, the
reference position return complete signals go on. If either axis is not at the reference position,
an alarm is issued. As a rule, command G27 must be issued in the normal operating mode.
2 In synchronous axis control, commands that require no axis motion, such as the workpiece
coordinate system setup command (G92) and the local coordinate system setup command
(G52), are set to the Y axis by program command Yyyyy issued to the master axis.
3 For signals such as external deceleration, interlock, and machine lock, only the signals issued
to the master axis are valid in the synchronous operating mode. Signals issued to other axes
are ignored.
4 The axis which is to be the master axis must be specified by parameter No. 075#0, #1.
5 The slave axis is exclusively set to the 4th axis.
6 When a move command is issued to the slave axis during synchronous operation, a P/S alarm
(No. 213) is issued.