Mitsubishi Electric M800VW Series Programming Manual page 880

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.35 NC Axis/PLC Axis Switchover
Command from outside the mode
If PLC axis command (command from PLC axis I/F) is issued to the axis in NC axis mode, PLC axis command is ignored and
NC axis command continues. Moreover, when the command is issued by the buffering mode, the subsequent buffer
commands are all ignored.
When manual feed command is issued from NC axis to the axis in PLC axis mode, the operation error (M01 0005) (*1) occurs.
Then the NC axis command is ignored, and the PLC axis command continues. Also, if the movement command is issued by
the program, the program error (P32) occurs, and the program is stopped. However, movement commands to the other NC
axes and parameter input by program do not cause any alarms.
(*1) When the operation error (M01 0005) occurs, the NC axis No. is displayed.
Unit system
For the switching axis, the unit of movement data or machine position, etc. on PLC axis I/F follows the PLC unit (#1005
plcunit) and PLC axis command (inch) (#1042 pcinch) of PLC axis. Other units (such as machine position of Drv monitor or
parameter setting) are the same as NC axis.
Also, changing command unit system with G20/G21 is invalid for the movement data or machine position, etc. on PLC axis I/
F.
Speed display
For the speed (F) on operation screen, the speed of the axis in PLC axis mode is not displayed. When the other axes are
simultaneously moving, the composite speed of the axis which is not in PLC axis mode is displayed.
Coordinate system
Position command during the PLC axis mode is issued using positions on the machine coordinate of the NC axis.
When the axis is moved by PLC axis, the machine values, workpiece coordinates and relative values of the NC axis are
updated. Also, the NC axis workpiece coordinates are updated when workpiece coordinates are changed with G54, etc.,
during the PLC axis mode.
Tool compensation
If the axis is switched to the PLC axis as keeping the tool compensation amount, including the length and radius
compensation valid in the NC axis mode, the compensation amount is retained. However, when the axis in the PLC axis mode
is moved by the compensation amount, the program error (P32) occurs.
When the axis in the PLC axis mode is returned to zero point, the compensation amount is cleared.
859 IB-1501668-B