Hitachi VM40 II seicos M3 specific pallet programming - CNC ...

Here's what we use; (below)
The main pallet change program references a system variable (#1032) and rewrites its bit value to decimal, and writes that to a common variable (#547)
Now, the trick is to ensure that your ladder is using one of the "User I/O Interface" bits when it looks at the pallets.
In our case, the ladder writes to a register R2801.4 ("UI012") "A pallet" and R2801.5 ("UI013") "B pallet".
In the pallet change program, these bits are referenced using system variable (word) #1032.
If you look at the program, if the system variable (#1032) is equivilant to 2048 (12th bit ON) then write #547=1
If it equals 4096 (13th bit ON) then #547=2.

*******************
%
O9001(PALLET SHUTTLE)
G0G80G94G98M15
G91
G28Z0
G30X0Y0P4
G28B0
G30Z0P4
M60
M181
#547=#1032
M182
(CHECK #547 IS 1 OR 2)
IF[#547EQ2048.]#547=1
IF[#547EQ4096.]#547=2
(CHECK #1 OR #2)
IF[#547EQ1]GOTO777
IF[#547EQ2]GOTO777
#3000=182(PALLET # ERROR)
N777
G0G90D0H0
SETVN547(PALLET #)
M99
%

******************
O0001(MAIN PALLET PROGRAM)
N1
IF[#547EQ2]GOTO2
M192(PALLET 1 CHECK)
M98P0100 (FIRST PALLET PROGRAM CALL)
M60

N2
M193(PALLET 2 CHECK)
M98P9999 (SECOND PALLET PROGRAM CALL)
M60
M99
%
O9999(DUMMY PROGRAM)
G4X20.
M99
%