Mitsubishi Electric MELSEC-Q Series - Page 47

2 REPLACEMENT OF CPU MODULE
2 - 17
: Available : Although available, specifications such as setting method partially differ. : Not available
*1 An SRAM card is required.
*2 SWIVD/NX-GPPQ is required.
Function Description
QnA
series
Q series
Precautions for replacement Reference
Q2ASCPU
(S1)
Q2ASHCPU
(S1)
QnUCPU
Control
Number of general
data processing
Sets the number of general data processing
executed in one END operation.

For the Q series, use the COM instructions or
set the communication reserved time with
special register (SD315) if necessary.
-
Clock function
Reads or writes the internal clock data of the
CPU module.
The clock data consists of year, month, day,
hour, minute, second and a day of the week.

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.
-
Debug
Write during RUN
Changes the programs of (writes programs
to) the running CPU module.

For the Q series, it is necessary to set the
reserved capacity for the write during RUN in
advance. (default value is 500 steps.)
Section
2.4.3
Status latch
Stores the data of the entire devices at the
time of error occurrence to the memory
cassette or built-in memory and monitors the
stored data by a peripheral.

*1 *2

The Q series does not support the status latch
function.
-
Sampling trace
Stores the data of the specified device
memory area in a memory card at a set
interval to check the changes of the device
memory area and monitors the stored data
by a peripheral.

*1

The Q00UJCPU does not support the sampling
trace function.
-
Program trace
Collects the execution status of the specified
steps in specified program and stores it in a
file.

*1 *2

The Q series does not support the program
trace function.
-
Simulation function
Detaches I/O modules or special modules
from the CPU module and simulates the
program upon the steps operation.

*1 *2

The Q series does not support the simulation
function.
Consider debugging with the GX Works2
simulation function.
-
steps operation
Stops the execution of a sequence program
at the specified steps.
 
The Q series does not support the steps
operation function.
Consider debugging with the GX Works2
simulation function.
-
Execution time
measurement
(program monitor
list, scan time
measurement)
Measures the processing time for each
program.

The execution time measurement can be
checked on the Program monitor list screen of
GX Works2.
-
Module access
interval read
Monitors the access interval of special
function modules or peripherals.

This function is the same as "module service
interval" of the Q series.
-
Maintenance
Online I/O module
change
Replaces input/output modules while the
CPU module is in operation.
 
To replace the input/output modules online, use
the Process CPU.
-
Self-diagnostic
function
Performs self-diagnostics to check for errors,
detect errors, and stop the CPU module.

Error codes differ between the QnAS series and
Q series.
-
Error history
Stores errors that are detected with the
diagnostic function in the CPU module or
memory card.
The stored history data can be monitored
with a peripheral.
 --