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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
2.7.3 Memory capacity setting range
~ Built-in memory capacity 3 Can be set by changing parameter.
Cautions on setting the memory capacity
When one block is set in each capacity setting, the memory capacity is reduced by 500 steps.
Each setting should satisfy the following expression:
1) With regard to the comment capacity, up to 50 device comments can be set in one block.
2) With regard to the file register capacity, up to 500 (16-bit) file registers can be set in one block.
3) In the special unit initial value setting
*1
, 8 blocks (4000 steps) are used.
4) In the positioning setting
*2
, 18 blocks (9000 steps) are used.
5) In the built-in CC-Link/LT setup
*3
, 1 block (500 steps) are used.
*1. This item is supported only in FX
3U/FX3UC PLCs, and can be set using GX Developer Ver. 8.23Z or later.
*2. This item can be set using GX Developer Ver. 8.23Z or later in FX
3U/FX3UC PLCs, and using GX Developer
Ver. 8.72A or later in FX
3G PLCs.
*3. This item is supported only in the FX
3UC-32MT-LT-2, and can be set using GX Developer Ver. 8.68W or later.
Caution
• After changing the memory capacity setting, make sure to write both the programs and parameters to the PLC.
If only the parameters are written to the PLC, program errors (such as parameter error, circuit error and grammar
error) may occur in the PLC.
•FX
3G PLCs operate in the extension mode when the program capacity (which is available for sequence programs,
and excludes the comment capacity, file register capacity, etc.) is 16,001 steps or more, and operate in the
standard mode when the program capacity is 16,000 steps or less. The instruction execution time is shorter in the
standard mode than in the extension mode.
Example: Time required to execute the basic instruction "LD"
Standard mode: 0.21 µs Extension mode: 0.42 µs
Memory capacity setting
Comment
capacity setting
Unit: Block
File register
capacity setting
Unit: Block
Special unit
initial value
setting
*1
Unit: Block
Positioning
setting
*2
Unit: Block
Built-in CC-Link/
LT Setup
*3
Unit: Block
Number of
steps
FX3U
FX3UC
FX3G
2000 steps 33 0 to 3 0 to 3 – – 1
4000 steps 33 0 to 7 0 to 7 – – 1
8000 steps 33 0 to 15 0 to 14 8 – 1
16000 steps 33 0 to 31 0 to 14 8 18 1
32000 steps 3 ~ 0 to 63 0 to 14 8 18 1
64000 steps ~ – 0 to 127 0 to 14 8 18 1
Memory capacity
setting range
Comment
capacity setting
≥
File register
capacity setting
Special unit initial
value setting
*1
Positioning
setting
*2 *3
++ +
Built-in CC-Link/LT
Setup
+