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Instructions for Moving Data
Special function module address
Since you can attach multiple special function modules to a single controller each module
needs to have a unique identifier so that you can address it to transfer data to and from it. Each
module is automatically assigned a numerical ID in the range from 0 to 7 (you can connect a
maximum of 8 special function modules). The numbers are assigned consecutively, in the
order in which the modules are connected to the PLC.
Starting address in the buffer memory
Every single one of the 32,767 buffer addresses can be addressed directly in decimal notation
in the range from 0 to 32,767 (FX
that the memory cell with the lower address stores the less significant 16 bits and the cell with
the higher address stores the more significant bits.
This means that the starting address for 32-bit data is always the address containing the less
significant 16 bits of the double word.
Number of data units to be transferred
The quantity of data is defined by the number of data units to be transferred. When you execute
a FROM or TO instruction as a 16-bit instruction this parameter is the number of words to be
transferred. In the case of the 32-bit versions DFROM and DTO the parameter specifies the
number of double words to be transferred.
16-bit instruction
Units of data: 5
D100
D101
D102
D103
D104
5 – 14
: 0 to 31). When you access 32-bit data you need to know
1N
Buffer address n+1
More significant 16 bits
Adr. 5
Adr. 6
Adr. 7
Adr. 8
Adr. 9
More Advanced Programming
FX -4D A
2N
D / A
Special function
Module 1
module 0
Buffer address n
Less significant 16 bits
32-bit data
32-bit instruction
Units of data: 2
D100
D101
D102
D103
D104
FX -4A D-P T
2N
Module 2
Adr. 5
Adr. 6
Adr. 7
Adr. 8
Adr. 9
MITSUBISHI ELECTRIC
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