Memory Capacity Setting Range - Mitsubishi Electric FX3G SERIES 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
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
*2. This item can be set using GX Developer Ver. 8.24A or later in FX
Ver. 8.72A or later in FX
*3. This item is supported only in the FX
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 programs,
3G
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:
• The FX /FX
3U
- The FX -FLROM-1M (memory cassette) has an area dedicated to the storage of symbolic information, and can
3U
store up to 1300 kB.
- When storing the symbolic information in any memory cassette other than the FX
memory, make sure that amount of the symbolic information to be stored does not exceed the available memory
capacity.
It is recommended to use the FX
stored.
Symbolic information capacity = Maximum capacity of memory cassette - Memory capacity set by parameters
It is possible to check the symbolic information capacity using the memory capacity calculation (offline) of GX Works2.
• When symbolic information is stored, it is deleted if the memory capacity set by parameters is changed.
After changing the memory capacity, write the symbolic information again.
46
Comment
capacity setting
3U
FX
3G
Unit: Block
3UC
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
/FX
3U
PLCs.
3G
Time required to execute the basic instruction "LD"
Standard mode: 0.21 μs
PLC can store symbolic information in the following capacity:
3UC
-FLROM-1M when there is a large amount of symbolic information to be
3U
→ Refer to the GX Works2 Version 1 Operating Manual (Common) for details.
Built-in memory capacity
Special unit
File register
initial value
capacity setting
setting
Unit: Block
Unit: Block
0 to 3
0 to 7
0 to 14
0 to 14
0 to 14
0 to 14
Special unit initial
+
value setting
*1
, 8 blocks (4000 steps) are used.
, 1 block (500 steps) are used.
PLCs, and can be set using GX Developer Ver. 8.24A or later.
3UC
-32MT-LT-2, and can be set using GX Developer Ver. 8.68W or later.
3UC
Extension mode: 0.42 μs
2 Overview (Sequence Program)
2.7 Types and Setting of Parameters
Can be set by changing parameter.
Positioning
*2
setting
*1
Unit: Block
– –
– –
8 –
8 18
8 18
8 18
Positioning Built-in CC-Link/LT
+ +
*1 *2
setting
/FX PLCs, and using GX Developer
3U 3UC
-FLROM-1M or to the built-in
3U
Built-in CC-Link/
*3
LT Setup
Unit: Block
1
1
1
1
1
1
*3
Setup