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3.2 Parameter
The parameters are basic setting values applied to a programmable controller in
order to control objects as planned.
The parameters are divided into the PLC parameter, network parameter, and remote
password as shown below.
* A shaded area in the following table indicates the items to be set in this textbook.
Item Description
Label Sets a label (name and application) of a programmable controller CPU.
PLC name
Comment Sets a comment for the label of a programmable controller CPU.
Timer limit setting Sets the time limit of the low-speed or high-speed timer.
RUN-PAUSE contacts Sets contacts for controlling RUN and PAUSE of a programmable controller CPU.
Latch data backup operation
valid contact
Sets contact devices in order to execute the latch data backup operation.
(Only for Universal model QCPU)
Remote reset Sets whether to allow a remote reset operation from GX Works2.
Output mode at STOP to
RUN
Sets the status of an output (Y) when the programmable controller is switched from STOP
to RUN.
Floating point arithmetic
processing
Sets whether to execute floating-point processing in double precision.
(Only for high performance model QCPU)
Intelligent function module
setting
• Sets the interruption pointer assignment of a module.
• Sets the start I/O number and start SI number.
Common pointer No. Sets the start number of the pointer used as a common pointer.
Points occupied by empty
slot
Sets the number of empty slots for the main or extension base unit.
System interrupt settings
• Sets the start number of the interrupt counters.
• Sets the execution interval for the interrupt pointers.
Interrupt program/fixed scan
program setting
Set whether to execute high-speed execution of an interrupt program.
Module synchronization
Set whether to synchronize the start-up of the programmable controller CPU with that of the
intelligent function module.
A-PLC compatibility setting Set whether to use the MELSEC-A series special relays/special registers.
Service processing setting
Sets the processing time and the number of times of service processing. (Only for Universal
model QCPU)
PLC system
PLC module change setting
Set this parameter to replace the CPU module using a memory card (Only for Universal
model QCPU).
File register
• Sets the file register file to be used in a program.
• Sets whether to transfer data to the standard ROM at a latch data backup operation.
(Only for Universal model QCPU)
Comment file used in a
command
Sets the device comment file to be used in a program.
Initial device value Sets the device initial value file to be used on the programmable controller CPU.
File for local device Sets the local device file to be used in a program.
PLC file
File used for
SP.DEVST/S.DEVLD
instruction
Sets the device data ROM write/read instruction file to be used in a program.
(Only for Universal model QCPU)
WDT (watchdog timer)
setting
Sets the WDT of the programmable controller CPU.
Error check Sets whether to detect specified errors.
Operation mode when there
is an error
Sets the programmable controller CPU operation mode when an error is detected.
Constant scanning Sets the constant scan time.
Breakdown history
Sets the storage destination for error histories of the programmable controller CPU. (Only
for high performance model QCPU)
PLC parameter
PLC RAS
Low speed program
execution time
Sets the execution time of a low-speed program in every scan. (Only for high performance
model QCPU)