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11 INSTRUCTIONS AND FUNCTIONS
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• The maximum number of bytes in the microcomputer program is determined by the
capacity set by the parameter. The head addresses that can be specified are as
follows:
CPU type name
A0J2HCPU
A1SCPU
A1SJCPU
A2CCPU
A52GCPU
A1CPU
A1NCPU
A2CPU (S1)
A2ACPU (S1)
A2NCPU (S1)
A2SCPU
A2UCPU (S1)
A2USCPU (S1)
A3CPU
A3ACPU
A3HCPU
A3MCPU
A3NCPU
A3UCPU
A4UCPU
A73CPU
A7LMS-F
• The maximum number of bytes of the microcomputer program that can be written at
one time is 128 bytes.
The entire microcomputer program can be written by specifying the head address
number and the number of bytes to be written in units of 128 bytes as follows:
Microcomputer program area
0
128
256
384
Use the data read from the PLC CPU by using the PCRD instruction for the microcomputer
program to be written. If other data is written, the PLC CPU cannot operate normally.
Capacity of the
microcomputer program
Maximum 14 k bytes
Maximum 10 k bytes
Maximum 26 k bytes
Maximum 58 k bytes for
both main and sub
microcomputer programs
Specify
%(3)=&H0,
%(4)=128.
Specify
%(3)=&H80,
%(4)=128.
Specify
%(3)=&HFF,
%(4)=128.
MELSEC-Q
Microcomputer program
address
&H0000 to &H37FE
&H0000 to &H27FE
&H0000 to &H67FE
&H0000 to &H7FE
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