Memory Capacity Setting Range - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2.7.3

Memory capacity setting range

Memory capacity setting
Number of FX
steps FX
3UC
2000 steps
4000 steps
8000 steps
16000 steps
32000 steps
64000 steps
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:
Memory capacity
≥
setting range capacity setting
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
4) In the positioning setting
5) In the built-in CC-Link/LT setup
*1. This item is supported only in FX
later.
*2. This item can be set using GX Developer Ver. 8.23Z or later in FX
Developer Ver. 8.72A or later in FX
*3. This item is supported only in the FX
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 PLCs operate in the extension mode when the program capacity (which is available for sequence
3G
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
Built-in memory capacity
Comment
capacity setting
3U
FX
3G
Unit: Block
0 to 3
0 to 7
0 to 15
0 to 31
0 to 63
– 0 to 127
Comment File register
+
capacity setting
*2
, 18 blocks (9000 steps) are used.
*3
, 1 block (500 steps) are used.
/FX
3U
3G
3UC
Special unit
File register
initial value
capacity setting
*1
setting
Unit: Block
Unit: Block
0 to 3 –
0 to 7 –
0 to 14 8
0 to 14 8
0 to 14 8
0 to 14 8
Special unit initial
+
*1
value setting
*1
, 8 blocks (4000 steps) are used.
PLCs, and can be set using GX Developer Ver. 8.23Z or
3UC
PLCs.
-32MT-LT-2, and can be set using GX Developer Ver. 8.68W
Extension mode: 0.42 µs
2 Overview (Sequence Program)
2.7 Types and Setting of Parameters
Can be set by changing parameter.
Positioning Built-in CC-
*2
setting Link/LT Setup
Unit: Block Unit: Block
–
–
–
18
18
18
Positioning Built-in CC-Link/LT
+ +
*2
setting Setup
/FX PLCs, and using GX
3U 3UC
1
*3
2
1
1
1
1
3
1
1
4
*3
5
6
7
8
9
10
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