694
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
31 Data Transfer 3 – FNC275 to FNC279
31.1 FNC278 – RBFM / Divided BFM Read
31.1
FNC278 – RBFM / Divided BFM Read
Outline
This instruction reads data from continuous buffer memories (BFM) in a special function block/unit in several
operation cycles in the time division method. This instruction is convenient to read receive data, etc. stored in
buffer memories in a special function block/unit for communication in the time division method.
FROM (FNC 78) instruction is also available to read the buffer memory (BFM) data.
→
For FROM (FNC 78) instruction, refer to Section 15.9.
1. Instruction format
2. Set data
3. Applicable devices
S
: Except special data register (D)
Operand Type
Description
Data Type
m1
Unit number [0 to 7]
16-bit binary data
m2
Head buffer memory (BFM) number [0 to 32766]
Head device number storing data to be read from buffer memory (BFM)
n1
Number of all buffer memories (BFM) to be read [1 to 32767]
n2
Number of points transferred in one operation cycle [1 to 32767]
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS
T
C
D
R U
\G
V
Z Modify K
H
E
"
"
P
m1
3 3
3 3
m2
3 3
3 3
S
3
3
n1
3 3
3 3
n2
3 3
3 3
FNC 278
RBFM
16-bit Instruction
11 steps
RBFM
Mnemonic
Operation Condition
Continuous
Operation
−
Mnemonic
Operation Condition
32-bit Instruction
D
D
Содержание FX3U Series
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