I
•
•
4. A2CCPU
--------------------
MELSEC-A
Table
4.11
Device
List
(Continued)
Device
Application
Range
(Number
of
points)
Explanation
A
Accumulator
AO,
Al
(2)
Data register for storing the operation results of
basic
and
application
instructions.
Z
Z (1)
Used to
modify
devices
Index register
(X,
Y, M,
l,
8, F, T, C, D, W, R, K, H, Pl.
V
V (1)
N
Nesting
NO
to 7 (8 levels)
Indicates
the
nesting
of
master
controls.
P
Pointer
PO
to 255 (256)
Indicates
the
destination
of
the
branch
Instruction
(CJ, SCJ, CALL, JMP).
K-32768 to
32767
(16-bit
instruction)
Used to specify
the
timer/counter
set
value,
K
Decimal
pointer
number,
interrupt
pointer
number,
the
constant
K-2147483648 to 2147483647
number
of
bit
device
digits,
and
basic and
(32-bit
instruction)
application instruction
values.
Hexadecimal
HOto FFFF (16-bit instruction)
Used
to
specify
the
basic
and
application
H
constant
HO
to FFFFFFFF (32-bit instruction)
instruction
values.
IREMARKSI
The
step
relay
(8) may be
used
in
the
same
manner
as
the
internal
relay
(M).
For
Instance,
the
step
relay
comes
in
useful
when
writing
a
program
which
has
two
function
or
application,
l.e.
the
step
relay
can
be
used
specifically
in
accordance
with
the
function
or
application,
Inde-
pendently
of
the
internal
relay.
4-59
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