Mitsubishi Electronics FX3G User Manual
44
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
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 PLC 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.
Some items cannot be set depending on the used PLC or programming tool. Refer to the manual of the used PLC and
programming tool for details.
Almost all FX PLC 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.
Some items cannot be set depending on the used PLC or programming tool. Refer to the manual of the used PLC and
programming tool for details.
2.7.1
Parameter list
The following items may be set in the parameter settings.
Classification
Item
Description
Memory capacity
Memory
capacity
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
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
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 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
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 file registers
require 500 steps in the memory capacity.
Other special
setting
capacity
setting
capacity
1) This parameter sets whether or not the special unit/block initial value setting function is used.
When this function is used, this function requires 4000 steps (8 blocks) in the memory
capacity.
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, this setting requires 9000 steps
(18 blocks) in the memory capacity.
(18 blocks) in the memory capacity.
3) This parameter sets whether or not the built-in CC-Link/LT function is used.
When this function is used, this function requires 500 steps (1 block) in the memory capacity.
Device setting
Latch range
setting
setting
This parameter enables to change the latched (battery backed) device range and the non-latch
device range inside the PLC.
device range inside the PLC.
I/O assignment
setting
setting
I/O assignment
setting
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.
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
setting
Special unit
setting
setting
This parameter sets the initial values of the buffer memory (BFM) for each special unit/block
number.
It is necessary to set the memory capacity.
number.
It is necessary to set the memory capacity.
Built-in
CC-Link/LT
Setup
CC-Link/LT
Setup
This parameter sets the transmission speed, point mode and station information. The memory
capacity setting is required to set the station information.
capacity setting is required to set the station information.
PLC system
setting
setting
Batteryless
mode
mode
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.
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
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.
When the check box "Use Battery" is checked, general type devices are changed to latched
(battery backed) type devices.
Modem
initialization
initialization
This parameter automatically sends a specified AT command as an initialization command to a
modem connected to the serial port.
modem connected to the serial port.
RUN terminal
input setting
input setting
This parameter sets whether one input terminal in the PLC is used for RUN input.
RUN terminal
input number
input number
This parameter specifies the input number of the RUN input described above.
X000 to X017 (Up to the built-in input number of main unit)
X000 to X017 (Up to the built-in input number of main unit)