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3. SPECIFICATIONS
MELSEC-A
*I: When the CPU modules other than A3H, A2A(S1), and A3A are used,
devices X (input) are allocated with
2
inputs per device.
To include devices X in designated devices, set as follows:
((number of designated X devices x 2)
+
number of other designated
devices)
5
40
If only devices X are designated, the number of inputs usable for one
communications time is half the value mentioned in the table.
*2: Writing during a program run may be carried out if all the following
conditions are met:
(This is different from the write during PC RUN with a MELSEC-A series
peripheral device (e.g., AGGPP).)
(a) The PC CPU is type A3, A3N, A3H, A3M, A73 or A3A,
(b) The program is not the currently running program.
(includes subprograms called by the currently running main pro-
gram)
4
(c) The PC CPU special relay is in the following states:
............
1) M9050 signal flow exchange contact
OFF (A3CPU only)
...................
2) M9051 (CHG instruction disable)
ON
POINT
When the AJ71C24 is used together with the A2ACPU (SI) or A3ACPU,
use the commands in Table 3.4 to perform the following functions:
Batch readlwrite, test, monitor data registration, and monitor of device
memory
0
Batch readlwrite of extension file registers by designating device nurn-
bers (continuous numbers)
I
0
Batch readlwrite of extension comments
When the commands in Table 3.3 are used, the available functions and
the range of devices which can be designated are limited to those avail-
able with the A3HCPU.
Accordingly, A2ACPU(SI) and A3ACPU external devices are not acces-
sible.
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