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3 CPU MODULE MEMORY CONFIGURATION
3.1 Memory Configuration
Device/label memory
Device/label memory has the following areas.
Signal flow memory
This memory is used to memorize the execution status of the instruction in the last scan. The CPU module judges whether to
execute a rising/falling edge execution instruction by referring to the signal flow memory.
The execution status of the last instruction is stored in the signal flow memory in two ways: executed or not executed. The
instructions that refer to the signal flow memory judge whether to execute a rising/falling edge execution instruction depending
on the input condition of the instruction and the execution status of the last instruction stored in the signal flow memory.
• For a program, the same number of areas as steps of the program are assigned to the signal flow memory (for program).
• For a function, the signal flow memory is not assigned since the instructions that refer to the last execution status of the
signal flow memory cannot be used in the function.
• For a subroutine-type function block, the same number of areas as the function block steps are assigned to the signal flow
memory (for FB). Different areas are assigned to each instance. When the macro type function block is called from the
subroutine type function block, the areas including the ones used for the macro type function block are assigned.
• For a macro type function block, the same number of areas as the number of steps of the macro type function block are
assigned to the signal flow memory (for program).
For instances of the function block, refer to the following.
MELSEC iQ-F FX5 Programming Manual (Program Design)
The signal flow unit is 1 bit.
[FX5S/FX5UJ CPU module]
The program capacity is fixed at 48000 steps, and the capacity of the signal flow memory is as follows.
• Signal flow memory (for program): 48000 step (6000 byte)
• Signal flow memory (for FB): 131072 step (16K byte)
[FX5U/FX5UC CPU module]
The capacity of the signal flow memory varies according to the program capacity setting.
• Signal flow memory (for program)
- 64000 step…64000 step (8000 byte)
- 128000 step…128000 step (16000 byte)
• Signal flow memory (for FB)
- 64000 step…131072 step (16K byte)
- 128000 step…262144 step (32K byte)
Area Storage area size Application
Device/label memory (standard) 48 K words ■ FX5S/FX5UJ CPU module
• R, W, SW, labels, and latch labels are fixed in the memory.
63 K words ■FX5U/FX5UC CPU module
• R, W, SW, labels, and latch labels can be placed in this memory in variable lengths.
• R and W can be backed up in the event of a power interruption only when the optional battery
is installed. Also, latch label capacity can be increased when the battery is installed.
Device/label memory (fast) 12 K words ■FX5S/FX5U/FX5UC CPU module
• Bit devices, T, ST, C, LC, D, Z, and LZ are fixed in the memory.
■FX5U/FX5UC CPU module
• Bit devices, T, ST, C, LC, D, Z, LZ, labels, and latch labels can be placed in this memory in
variable lengths.
Signal flow memory
Executed
Not executed
INCP wCount1
INCP wCount2
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