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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
The device numbers that can be designated vary according t o the type of
memory cassette and the PC CPU parameter setting.
(The UTLP-FN1
Operating Manual or the A2A(Sl)/A3A CPU User's Manual give details.)
For block numbers that do not exist in the memory cassette, device numbers
are not allocated. In this case, the device numbers are allocated as indi-
cated below, skipping non-existent block numbers.
Device numbers
O
m
to
I
Block No. 1 area
/
to
/
Block No.2area
1
Blocks Nos.
3
to 9 do
not
exist
16384
( 1 -
due to low memory capacity.
to
I
Block No. 10 area
1
to
1
Block No. 11 area
I
(b) A device number is designated in 7 characters.
Designation example 1
:
To designate R10 in block number I :
000001 0
A
blank coda (20H)
can
be
used to express leading zeros
Designation example
2:
(the underlined 0s in 0008200)
To designate R8 in block number 2:
POINT
(1) The AnACPU dedicated commands NR and NW can only be used for
readlwrite operations at the extension file registers of block numbers
1 to 256.
t -
(
They can be used regardless of the parameter's file register setting.
(2)
Use the commands described in Section 8.8.1 t o access the parameter
set file registers (R) or to access a file register by designating a block
number.
(3) The following equation is used to calculate the head device number to
be designated with the AnACPU dedicated commands NR and NW.
(To designate device number 'm" (0 to 8191)
in
the"n'th block (n
r
1))
1
Head device number
=
(n-I) x 8192
+
m
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