Types And Setting Of Parameters; Parameter List - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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
Memory
capacity
Device setting
I/O assignment
setting
Item
This parameter specifies the maximum value for the number of steps to which a
sequence program can be input.
Memory 1) The upper limit is determined by the capacity of the built-in memory or optional
capacity memory.
2) The program memory, file register, comment area, and other special setting
capacities are contained in this memory capacity.
This parameter incorporates comments into the program memory.
1) Because comments remain in the PLC, the contents can be easily understood at the
Comment time of maintenance.
area 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.
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.
File register
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.
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
Other special
table) in TBL (FNC152) instruction is used. When this setting is used, the program
setting
memory capacity is reduced because this setting requires 9000 steps (18 blocks) in
capacity
the memory capacity.
3) This parameter sets whether or not the built-in CC-Link/LT function is used
When this function is used, the program memory capacity is reduced because this
function requires 500 steps (1 block) in the memory capacity.
Latch range This parameter enables to change the latched (battery backed) device range and the
setting non-latch device range inside the PLC.
I/O This setting is not written to the PLC.
assignment When the I/O range is set according to the system configuration, however, inputs and
setting outputs are checked by the program check in GX Developer.
This parameter sets the initial values of the buffer memory (BFM) for each special block/
Special unit
unit number.
setting
It is necessary to set the memory capacity.
Built-in
Built-in CC-Link/LT Setup
CC-Link/LT
This parameter sets the transmission speed, point mode and station information. The
*3
Setup memory capacity setting is required to set the station information.
2 Overview (Sequence Program)
2.7 Types and Setting of Parameters
Description
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*2
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