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FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.9 FNC 78 – FROM / Read From A Special Function Block
2. 32-bit operation (DFROM and DFROMP)
Special extension unit/block (BFM) → PLC (word device)
"n" 32-bit data starting from the buffer memory (BFM) # [m2+1, m2] inside a special extension unit/block No. m1 are
transferred (read) to "n" devices starting from [ +1, ] inside a PLC.
Related devices
Cautions
• Digit specification in bit device
For the 16-bit operation instruction, specify K1 to K4. For the 32-bit operation instruction, specify K1 to K8.
• Note that the 32-bit values [m1+1, 1], [m2+1, m2] and [n+1, n] are valid when D or R is specified as "m1", "m2" or
"n" in a 32-bit instruction.
In the case of "DFROM D0 D2 D100 R0", "m1" is [D1, D0], "m2" is [D3, D2], and "n" is [R1, R0].
Device Name Description
M8028 Enable interrupt flag
Disables or enables interrupts while FROM/TO instruction is executed.
→ For details, refer to "Acceptance of interrupts while FROM/TO instruction is executed
(M8028)" on the next page.
OFF: Disables interrupts.
(Interrupts are executed after FROM/TO instruction is executed.)
ON: Enables interrupts.
D
D
Command
input
FNC 78
DFROM
m1 m2 nD
Unit No.
m1 = 0 to 7
Transfer source BFM #
(Special extension unit/block)
m2 = 0 to 32765
Transfer destination (PLC)
Number of transfer points
n = 1 to 16383
D
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