Mitsubishi Electric MELSEC iQ-R Series User Manual page 97

Note that the position of the memory area may change when the data type of an item is changed.
The following data types are assigned consecutively to the memory areas in increments of 16 or 32 bits.
Insert padding so that the data type assignment always starts from a word boundary even though the data
type is changed.
• WORD type (Word [unsigned]/Bit string [16 bits])
• DWORD type (Double word [unsigned]/Bit string [32 bits]
• REAL type (Single-precision real number)
Before change
Label assignment
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
* * * * * * * *
Word
Word
Dword
* * * * * * * *
* * * * * * * *
After change
Label assignment
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
* * * * * * * *
Word
Dword
* * * * * * * *
* * * * * * * *
Insert the padding of 8bits.
When the padding is inserted, the size of I/O data needs to be changed in the I/O data exchange. Check and
correct the refresh settings of both the CPU module and the RJ71PN92.
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
Word→Byte
* * * * * * * *
* * * * * * * *
On a word
boundary
3 GX Configurator-PN
3.1 Window Structure
3
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