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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
HO
to
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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