Mitsubishi Electric M800VW Series Programming Manual page 861

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.34 PLC Axis Indexing
Zero point return
After zero point return has been executed under NC control or PLC control, the system regards that zero point return has also
been done under the other control.
Restrictions
 NC axis which is applicable to PLC control (the NC axis for which the axis No. in PLC axis indexing has been set with
"#12800 chgauxno") cannot be used as primary/secondary axis in synchronous control. Setting the axis in "Synchronization
control operation method (R2589)" as primary/secondary axis causes an operation error "M01 1036 Synchro ctrl setting
disable".
 The axis under spindle's contour control, which has been set in "#1020 sp_ax", cannot be assigned as the NC axis applica-
ble to PLC control. If the axis is assigned, "S02 Initial parameter error 12800" will occur at the power ON.
 PLC axis indexing interfaces cannot be used for absolute position initialization set when the NC axis is operated in PLC
control by the machine without PLC axis. Complete the absolute position initialization set under NC control.
 H/W OT of NC axis is invalid when operating NC axis under PLC control.
 Manual operation in NC's manual mode is invalid when operating NC axis under PLC control. (Operation error "M01 Aux
axis changeover error" will occur.)
Caution
(1) Commanding from machining program to NC axis under PLC control causes a program error "P32 Illegal address" and
stops the operation.
(2) Axis movement by PLC axis indexing does not work by turning ON "Operation start (ST)" under NC control. That causes
"Start not possible (AUXST4.bitB)" ON as status.
(3) Turning OFF "NC axis control selection n-th axis" while moving NC axis (n-th axis) with machining program command
stops the machining program and causes an operation error "M01 0166 Aux axis changeover error".
(4) Changing "NC axis control selection N-th axis" during any axis movement causes an operation error. The axis will decel-
erate to stop if "NC axis control selection n-th axis" is changed during its movement.
(5) When PLC control is changed to NC control, the movement amount in the PLC control will be regarded as manual inter-
rupt amount.
(6) Current limit value and excessive error width of NC axis will be enabled immediately after the change from PLC control to
NC control.
(7) The change from NC control to PLC control will not immediately enable the current limit value and excessive error width:
enables the ones of the operation parameter's group which has been selected at the Operation start (ST) ON.
(8) Alarms for NC axis under PLC control will be output to NC part system.
IB-1501668-B 840