8. MICROCOMPUTER MODE
8
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1
MELSEC-A
8. MICROCOMPUTER MODE
This section gives the microcomputer mode specifications, memory map and data
memory configuration of the ACPU modules. Note that the AnA, A2AS, AnU,
QCPU-A (A Mode) and A2USH board cannot use the microcomputer mode.
8.1 Specifications of Microcomputer Mode
Table 8.1 Specifications of Microcomputer Mode
Module
CPU
(Clock)
Microcomputer
Program Area
Work Area
Stack Area
Instructions which
cannot be used *2
A1
0 to 10K bytes
A2 (S1)
0 to 26K bytes
A3
8086
(8 MHz)
0 to 58K bytes (Main)
0 to 58K bytes (Sub)
A1N
0 to 10K bytes
A2N (S1)
0 to 26K bytes
A3N
0 to 58K bytes (Main)
0 to 58K bytes (Sub)
A3V
0 to 58K bytes (Main)
0 to 58K bytes (Sub)
A73
0 to 58K bytes (Main)
0 to 58K bytes (Sub)
A52G
8086
(10 MHz)
0 to 14K bytes
A1SH,
A1SJH
8086
(30 MHz)
0 to 14K bytes
A2SH (S1)
0 to 26K bytes
A1FX
8086
(40 MHz)
0 to 26K bytes
A0J2H
0 to 14K bytes
A2C
8086
(8 MHz)
0 to 14K bytes
INT, INTO, IRET, IN,
OUT, HLT, WAIT,
LOCK, ESC
A3H
0 to 58K bytes (Main)
0 to 58K bytes (Sub)
A3M
80286
(8 MHz)
0 to 58K bytes (Main)
0 to 58K bytes (Sub)
A100
H
to A1FF
H
(256 bytes)
User area: 128 bytes (No
setting required by the
user)
INT, INTO, IRET, IN,
OUT, HLT, WAIT,
LOCK, ESC, CLI, STI
*1: Specify the microcomputer program area in multiples of 2K bytes.
The relation between the main (sub) program, sequence program, and
microcomputer program capacities is as indicated below:
*2: Never use the instructions specified as those which cannot be used in preparing
microcomputer programs. If they are used, the PC CPU will malfunction when
a microcomputer program is run.
Main (sub)
program memory
capacity
sequence
program memory
capacity
microcomputer
program memory
capacity
=
+
*1
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