Precautions - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.35 NC Axis/PLC Axis Switchover

14.35.4 Precautions

(1) When there are as many non-switchable PLC-exclusive axes as the maximum number of PLC axes, this function cannot
be used. When the said condition is satisfied with the parameter "#2187 chgPLCax" set to nonzero, the alarm (Y05 2187)
occurs at the power ON. When the number of PLC-exclusive axes is smaller than the maximum number of PLC axes, this
function can be used even if the total of NC axes, PLC axes and spindles reaches the maximum number of control axes.
(2) For the switching axis in PLC axis mode, when the control mode of PLC axis is set to single mode same as PLC-exclusive
axis, turn ON PLC axis control valid signal (Y770), and when switched to buffering mode, turn ON PLC axis control buff-
ering mode valid signal (Y723). When these signals are OFF, the command is ignored.
(3) The status signal on PLC axis I/F is updated only in PLC axis mode, but not updated in NC axis mode. However, the
slave axis under synchronous control is not updated even in PLC axis mode. Therefore, when switching PLC axis control
to NC axis control, as the status signal retains the value immediately before switching, do not use the status signal in NC
axis mode.
(4) At the time the 1st to 4th reference positions are reached, when switching to PLC axis control, the 1st to 4th reference
position arrival signals are turned OFF.
(5) When the switching axis is set to Dog-type absolute position detection system (parameter "#2049 type" = "3"), perform
the zero point initialization set on NC axis. During NC Axis/PLC axis switchover, the movement command of the initializa-
tion set is ignored. The zero point return on PLC axis after the zero point is established, the highspeed reference point
return is performed.
(6) When the parameter is set, soft limit IB and IIB are valid even during PLC axis switchover. The alarm cannot be canceled
with PLC axis reset. It can be canceled with NC side reset regardless of the control mode.
(7) When switching NC axis and PLC axis using M code, confirm that the mode is switched (ON or OFF of NC axis/PLC axis
in switchover signal is switched) before turning ON miscellaneous function finish signal.
(8) The movement amount in PLC axis mode is treated as manual interrupt amount.
(9) When moving the axis in correction mode of synchronous control, set all the synchronous control axes to NC axis mode.
865 IB-1501668-B