Mitsubishi Electric MELSEC FX3U - FNC278 - RBFM; Divided BFM Read

740
FX3G/FX3U/FX3UC 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 over
several operation cycles by the time division method. This instruction is convenient for reading receive data,
etc. stored in buffer memories in a special function block/unit for communication by 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
XYMTCSD
 .b KnX KnY KnM KnS T C D R U\G VZModifyKH E "  "P
m1 33 33
m2 33 33
S 33
n1 33 33
n2 33 33
FNC 278
RBFM
16-bit Instruction
11 steps
RBFM
Mnemonic Operation Condition
Continuous
Operation
−
Mnemonic Operation Condition
32-bit Instruction
D
D