Mitsubishi Electric MELDAS C6 Programming Manual page 302

14. Coordinates System Setting Functions
(7) A new workpiece coordinate system 1 is set by issuing the G92 command in the G54
(workpiece coordinate system 1) mode. At the same time, the other workpiece coordinate
systems 2 through 6 (G55 to G59) will move in parallel and new workpiece coordinate systems
2 through 6 will be set.
(8) An imaginary machine coordinate system is formed at the position which deviates from the
new workpiece reference (zero) point by an amount equivalent to the workpiece coordinate
system offset amount.
-X
-X
-X(G54')
[W1]
-X(G55')
[W2]
-Y(G55')
After the power has been switched on, the imaginary machine coordinate system is matched with the
basic machine coordinate system by the first automatic (G28) or manual reference (zero) point return.
(9) By setting the imaginary basic machine coordinate system, the new workpiece coordinate
system will be set at a position which deviates from that imaginary basic machine coordinate
system by an amount equivalent to the workpiece coordinate system offset amount.
(10) When the first automatic (G28) or manual reference (zero) point return is completed after the
power has been switched on, the basic machine coordinate system and workpiece coordinate
systems are set automatically in accordance with the parameter setting.
(11) If G54X-Y-; is commanded after the reference return (both automatic or manual) executed
after the power is turned ON, the program error (P62) will occur. (A speed command is
required as the movement will be controlled with the G01 speed.)
(12) Do not command a G code for which a P code is used in the same block as G54.1. The P code
will be used in the prioritized G command.
(13) When number of workpiece offset sets additional specifications is not added, the program
error (P39) will occur when the G54.1 command is executed.
14.10 Workpiece coordinate system setting and offset
[M]
-X(G54)
-X(G55)
W2
-Y(G55)
-Y
-Y(G54')
294
R#1
Reference (zero) point return
M
position
Basic machine coordinate
system zero point
Imaginary machine coordinate system
coordinate point based on G92
Old work 1 (G54) coordinate system
W1
Old work 2 (G55) coordinate system
New work 1 (G54) coordinate system
-Y(G54)
New work 2 (G55) coordinate system
-Y