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14 Applied Instructions (External FX I/O Device)
14.9 FROM / Read From A Special Function Block
382
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
3. Applicable devices
S: Refer to "Cautions".
Function and operation explanation
1. 16-bit operation (FROM, FROMP)
→ As for the common terms of FROM/TO instruction, refer to section 14.8.1.
From special extension (BFM) to PLC (word device)
16-bit data of n3 points starting from buffer memory (BFM) n2 in the special extension unit/block of unit
number n1 is transferred (read out) by the portion of n3 points starting from the device specified by in
the PLC.
2. 32-bit operation (DFROM, DFROMP)
From special extension (BFM) to PLC (word device)
32-bit data of n3 points starting from buffer memory (BFM) [n2+1, n2] in the special extension unit/block of
unit number n1 is transferred (read out) by the portion of n3 points starting from the device specified by
in the PLC.
Related devices
Operand
type
Bit Devices Word Devices Others
System user Digit designation System user
Special
unit
Index
Cons
tant
Real
Number
Character
String
Pointer
XYMTCS
D.b
KnX KnY KnM KnS T C D R
U\G
V Z Modifier K H E
""
P
S1
S1
zz
S1
S1
zz
S1 S1
zz
zzzzzz
S1
zz z
Device Name Content
M8028 Interrupt permit flag
Prohibit/permit interruption during execution of FROM/TO instruction.
→ As for the detail, refer to the following pages "Interrupt accept during
execution of FROM/TO (M8028)."
OFF : Interrupt prohibit (interrupt executed after FROM/TO instruction process)
ON : Interrupt permit
Command input
FROM
EN
n1
n2
ENO
d
n3
Transfer destination device
Unit No. of special
extension unit/block
Transfer origin buffer
memory (BFM) number
Number of transfer points
Command input
DFROM
EN
n1
n2
ENO
d
n3
Transfer destination device
Unit No. of special
extension unit/block
Transfer origin buffer
memory (BFM) number
Number of transfer points