Mitsubishi Electric MELSEC Q Series Handbook page 47

2
REPLACEMENT OF CPU MODULE
Function
Number of general Sets the number of general data processing
data processing executed in one END operation.
Reads or writes the internal clock data of the
CPU module.
Clock function
The clock data consists of year, month, day,
hour, minute, second and a day of the week.
Changes the programs of (writes programs
Write during RUN
to) the running CPU module.
Stores the data of the entire devices at the
time of error occurrence to the memory
Status latch
cassette or built-in memory and monitors the
stored data by a peripheral.
Stores the data of the specified device
memory area in a memory card at a set
Sampling trace interval to check the changes of the device
memory area and monitors the stored data
by a peripheral.
Collects the execution status of the specified
Program trace steps in specified program and stores it in a
file.
Detaches I/O modules or special modules
Simulation function from the CPU module and simulates the
program upon the steps operation.
Stops the execution of a sequence program
steps operation
at the specified steps.
Execution time
measurement
Measures the processing time for each
(program monitor
program.
list, scan time
measurement)
Module access Monitors the access interval of special
interval read function modules or peripherals.
Online I/O module Replaces input/output modules while the
change CPU module is in operation.
Self-diagnostic Performs self-diagnostics to check for errors,
function detect errors, and stop the CPU module.
Stores errors that are detected with the
diagnostic function in the CPU module or
Error history memory card.
The stored history data can be monitored
with a peripheral.
*1 An SRAM card is required.
*2 SWIVD/NX-GPPQ is required.
: Available : Although available, specifications such as setting method partially differ.
QnA
series
Q2ASCPU
Description
(S1)
Q2ASHCPU
(S1)



*1 *2

*1

*1 *2

*1 *2







Q series
Precautions for replacement
QnUCPU
For the Q series, use the COM instructions or
set the communication reserved time with
special register (SD315) if necessary.
The Q series handles the year in four digits
(western calendar), whereas the QnAS series
handles the year in the last two digits.
Pay attention to the handling of the day of the
week data.
For the Q series, it is necessary to set the
 reserved capacity for the write during RUN in
advance. (default value is 500 steps.)
The Q series does not support the status latch

function.
The Q00UJCPU does not support the sampling

trace function.
The Q series does not support the program

trace function.
The Q series does not support the simulation
function.

Consider debugging with the GX Works2
simulation function.
The Q series does not support the steps
operation function.

Consider debugging with the GX Works2
simulation function.
The execution time measurement can be
 checked on the Program monitor list screen of
GX Works2.
This function is the same as "module service

interval" of the Q series.
To replace the input/output modules online, use

the Process CPU.
Error codes differ between the QnAS series and

Q series.
 -
: Not available
Reference
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Section
2.4.3
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