Functional Comparison Between Qnas Series And Q Series - Mitsubishi Electric MELSEC Q Series Handbook

2
REPLACEMENT OF CPU MODULE

2.3.2 Functional comparison between QnAS series and Q series

Function
Executes the sequence program at the
Constant scan constant time intervals regardless of the
processing time of the program.
Holds the data of devices when turning off
Latch (data
the power, resetting, and a momentary
retention during
power failure longer than the allowable
power failure)
momentary power failure time occurs.
Remotely runs or stops the program
Remote RUN/
operations in the CPU module from external
STOP
switches or peripherals.
Stops operations while holding the output
PAUSE
status.
Interrupt Executes the program that corresponds to
processing the cause when an interrupt cause occurs.
Display priority of Sets the ERROR LED on/off status at an
ERROR LED error.
Manages such as parameters, sequence
File management programs, device comments, file registers as
files.
Selects a suitable execution type for
Structured program program application, and divides each
program by designer, process or others.
Assigns I/O points for each module
I/O assignment
regardless of its mounted position.
Reads sequence programs stored in the
only or a memory card to the built-in memory
Boot operation
of the CPU module when the operating
(ROM operation)
status of the module is changed to RUN and
executes the read programs.
Data protection
function (system
Prevents unauthorized access from
protection,
peripherals to programs and comments in
keyword
the built-in memory of a CPU module or
registration/
memory cards.
password
registration)
Sets an initial value of device memory, file
registers, and special function modules
Initial device value
when the CPU module is set from STOP to
RUN.
Sets the output (Y) status at the change from
Output status
STOP to RUN to reoutputting data before
setting at changing
STOP or outputting data after the operation
from STOP to RUN
execution.
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: Available : Although available, specifications such as setting method partially differ.
QnAS
series
Q2ASCPU
Description
(S1)
Q2ASHCPU
(S1)
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Q series
Precautions for replacement
QnUCPU
 -
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Target errors vary by model, but there is no

functional difference.
Memory configuration and data to be stored

differ between the QnAS series and Q series.
 -
When using a base unit with other than 8 slots,
set the number of slots with the parameter (I/O
assignment setting).
The Universal model QCPU, whose program
memory is a Flash ROM, does not have to
perform the ROM operation.
The Q series prohibits each file from being read/
written by password registration, whereas the
QnAS series prohibit the parameters and
programs from being read/written to the user
memory by keyword registration.
Memory configuration and data to be stored

differ between the QnAS series and Q series.
Resetting parameters is required to replace the

QnAS series with the Q series.
: Not available
Reference
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Section
2.4.1
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Section
2.4.4
Section
2.4.1
Section
7.7.12
Section
2.4.2
Section
2.4.1
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