Specifications

8
A2UCPU-S1
A2ACPU-S1
A2NCPU-S1
A4UCPU
A3UCPU
A3ACPU
A3NCPU
A2UCPU
A2ACPU
A2NCPU
A1NCPU
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Large memory/program capacity
The A Series enables choice of memory size by removable
memory cassette construction so that users can find the most
economical memory size. From the smallest 16k byte memory
cassette, A3NMCA-2, to the largest 1M byte, A4UMCA-128, 9
different memory cassette sizes are available. In addition, three
additional E
2
PROM type memory cassettes are provided for
AnU users. Those memory cassette have EEPROM memory as
non-volatile program storage in addition to the same size of
SRAM memory.
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Large I/O control
With the highest specification model of AnN or AnA, up to
2048 I/ O can be controlled. With AnU, a CPU can control 512/
1024/2048/4096 I/O depending on the model. This number of
I/O can be directly connected to the CPU rack, but all AnU
CUP models have the capacity to control 8192 I/O. This is the
total of the directly connected I/O plus I/O controlled through
the remote I/O system of MELSECNET/10 or CC-Link.
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Compatibility
Compatibility is maintained among the AnN, AnA and AnU
CPUs. All I/O modules, power supply modules, mounting
racks, special function modules are common to all these CPU
models. Also, the sequence program is upwardly compatible
from AnN to AnA to AnU. In addition, programs for A Series
are also compatible with A2C and AnS compact PLC Series.
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Advanced RAS and debugging functions
Seventy-six diagnostic items are available. An error history log
provides a list of the last 16 errors. Included is the time of
error generation and details of which error occurred. CHK
instructions identify the presence of user specified patterns at
the PLC’s inputs lines to identify faults in external circuits. On-
line sampling trace, status latch and device memory bus
monitoring functions are also available. Each of these
contributes to the AnA's highly advanced performance
characteristics.
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Complete self-diagnostic functions
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A watchdog timer (WDT) that can be set in 10 ms increments
up to a maximum of 2 sec., this function monitors calculation
congestion.
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CPU fault detection such as arithmetic circuit check and RAM
memory check.
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Memory fault detection by command check and parameter
check.
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Automatic measurement of scan.
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Comment display of detected fault (A3N only).
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Extended networking functions
All A Series PLCs support industry standard network systems
such as Ethernet, PROFIBUS, MODBUS, and Mitsubishi’s
MELSECNET systems.
In addition, a newly developed 10M bps network, MELSECNET/10,
has been added to the supported network line up. All A Series
CPU modules are compatible with the MELSECNET/10 network
and can exist in the same network segment. The combination
of MELSECNET/10 and AnU offers maximum functionality and
performance with a floating master function, increased 8k bits
+ 8k words of cyclically refreshed network device memory,
4 network segments per PLC and so on, in addition to
conventionally available cable redundancy and network
diagnostic monitoring.
The new open field network, CC-Link, is also supported by all
the A Series PLCs.
A CPU Features
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