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15 OTHER FUNCTIONS MELSOFT (b) Setting main program + subprogram capacity Write A3U/A4UCPU, QCPU(Amode) subprograms together with the main program. It is not possible to write a subprogram by itself. When writing a main program + subprogram, the main program capacity set in the PLC parameters, the automatically added parameters (fixed at 4K bytes), and the subprogram capacity, are written to the ROM. The subprogram capacity is automatically set at 64K bytes per subprogram. Example: Memory capacity setting for A3U/A4UCPU, QCPU(Amode) For A3UCPU For A4UCPU, QCPU(Amode) Parameters 4K bytes (fixed) Parameters 4K bytes (fixed) Main program Max. 30K steps (60K bytes) Network parameters Max. 16K bytes Total Max. total not to 64K bytes exceed 60K bytes Free 3K bytes Network parameters Max. 16K bytes Total not to Max. total exceed 64K bytes 60K bytes Subprogram 1 T/C set valuese 1K byte Subprogram T/C set valuese 1K byte Subprograms 30K steps (60K bytes) Main program 30K steps (60K bytes) 64K bytes Subprogram 1 30K steps (60K bytes) 64K bytes Free 3K bytes Subprogram 2 T/C set valuese 1K byte Subprogram 2 30K steps (60K bytes) 64K bytes Free 3K bytes Subprogram 3 T/C set valuese 1K byte Subprogram 3 30K steps (60K bytes) 64K bytes Free 3K bytes POINT The ROMs to which A3U/A4UCPU, QCPU(Amode) subprograms can be written are the 32KROM and the 64KROM. The 32KROM and 64KROM are capable of ROM operation with a subprogram written to them. The 32KROM and 64KROM can only be used with the A4UMCA-128 memory cassette. 15 - 17 15 - 17
