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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
2 Overview (Sequence Program)
2.7 Types and Setting of Parameters
2.7 Types and Setting of Parameters
Setting of parameters means setting the environment where the PLC operates.
Almost all FX PLCs can be used with factory default values.
However, when it is necessary to attach a memory cassette, set the comment capacity, set the communication
condition for serial ports, etc., the parameter settings must be changed using a programming tool such as personal
computer.
2.7.1 Parameter list
The following items may be set in the parameter settings.
Classification
Item Description
Memory capacity
Memory
capacity
This parameter specifies the maximum value for the number of steps to which a sequence
program can be input.
1) The upper limit is determined by the capacity of the built-in memory or optional memory.
2) The program memory, file register, comment area, and other special setting capacities are
contained in this memory capacity.
Comment area
This parameter incorporates comments into the program memory.
1) Because comments remain in the PLC, the contents can be easily understood at the time of
maintenance.
2) Up to 50 comments can be input when one block is specified, but the program memory
capacity is reduced because the comment area requires 500 steps in the memory capacity.
File register
This parameter incorporates data registers into the program memory.
1) A sequence program and control data such as machining set values can be handled
together, which is convenient.
2) Up to 500 file registers can be created when one block is specified, but the program memory
capacity is reduced because file registers require 500 steps in the memory capacity.
Other special
setting
capacity
1) This parameter sets whether or not the special block/unit initial value setting function is used.
When this function is used, the program memory capacity is reduced because this function
requires 4000 steps (8 blocks) in the memory capacity.
2) This parameter sets whether or not the positioning setting (constants and setting table) in
TBL (FNC152) instruction is used. When this setting is used, the program memory capacity
is reduced because this setting requires 9000 steps (18 blocks) in the memory capacity.
3) This parameter sets whether or not the built-in CC-Link/LT function is used
*2
.
When this function is used, the program memory capacity is reduced because this function
requires 500 steps (1 block) in the memory capacity.
Device setting
Latch range
setting
This parameter enables to change the latched (battery backed) device range and the non-latch
device range inside the PLC.
I/O assignment
setting
I/O assignment
setting
This setting is not written to the PLC.
When the I/O range is set according to the system configuration, however, inputs and outputs are
checked by the program check in GX Developer.
Special unit
setting
This parameter sets the initial values of the buffer memory (BFM) for each special block/unit
number.
It is necessary to set the memory capacity.
Built-in
CC-Link/LT
Setup
*3
Built-in CC-Link/LT Setup
*3
This parameter sets the transmission speed, point mode and station information. The memory
capacity setting is required to set the station information.
PLC system
setting (1)
[PLC mode]
Batteryless
mode
*1
This parameter sets the PLC operation mode without a battery.
When the baterryless mode is set, detection of battery voltage low level error is stopped
automatically, and consequently, contents of latched devices becomes inconsistent and are
initialized automatically.
Battery mode
*4
This parameter sets the PLC operation mode with a battery.
When the check box "Use Battery" is checked, general type devices are changed to latched
(battery backed) type devices.
Modem
initialization
This parameter automatically sends a specified AT command as an initialization command to a
modem connected to the serial port.
RUN terminal
input setting
This parameter sets whether one input terminal in the PLC is used for RUN input.
RUN terminal
input number
This parameter specifies the input number of the RUN input described above.
X000 to X017
(X000 to X007 in FX
3U-16M, FX3UC-16M and 14-point type FX3G PLCs)
(X000 to X014 in 24-point type FX
3G PLCs)