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Mitsubishi Electronics FX3G User Manual

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FX
3S
/FX
3G
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3GC
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3U
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3UC
 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
11
FN
C30
-FN
C3
9
R
ota
tion and 
Shi
ft
12
FN
C40-FN
C49
D
ata O
perati
on
13
FNC
50-FNC
59
High-Speed
 
Proc
essing
14
FM
C60-FN
C69
H
andy 
In
struction
15
FN
C70-FN
C79
E
xternal
 F
X
 I/O
 
De
vice
16
FNC
80-FNC
89
External
 FX 
Dev
ice
17
FNC1
00-
FNC10
9
Dat
a 
Transfer 2
18
FNC1
10-
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
 
Operation 2
20
FNC1
50-
FNC159
Pos
itioning 
Control
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
n
D ‚
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