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4. AnSHCPU MODULE
4 - 13
MELSEC-A
4.1.7 Memory capacity settings (main programs, file registers, comments, etc.)
The A1SHCPU, A2SHCPU(S1) provides 64 k (192 k) bytes of user memory area
(RAM).
Data for parameters, T/C set values, main programs, sampling trace, status latch,
file registers, and comments can be stored in the user memory area.
(1) Calculating memory capacity
The user memory can be divided into several memory blocks in accordance
with the parameter settings.
Table 4.5 Parameter settings and memory capacity
Item Setting module Memory capacity
Storage
onto ROM
Remark
Parameter,
T/C set values

4 k bytes (fixed)
Main
program
Sequence
program 1 k steps
(Main sequence program capacity)
×
2 k bytes
Possible
Microcomputer
program
2 k bytes
(Main micro computer program
capacity)
×
1 k byte
Sampling trace
Not available/
available
0/8 k bytes
Status
Data memory
Not available/
available
0/8 k bytes
latch
File registers
Not available/
available
(File registers' memory capacity) 1 k
byte
Impossible
File registers 1 k points
(File registers' number of points)
×
2 k bytes
Comments 64 points
Number of comments
64
+ 1 k byte
1 k byte is occupied by the
system when setting
comment capacity.
(2) Storage priority in user memory
The data set in the parameters is stored in the following sequence.
Occupies 4 k bytes for
parameters and T/C set
values
The memory capacity for
the file register status latch
is determined by the
number of file register
points set using
parameters.