Fnc278 - Rbfm / Divided Bfm Read - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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.
1. Instruction format
FNC 278
RBFM
2. Set data
Operand Type
m1
m2
D
n1
n2
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
m1
m2
D
n1
n2
: Except special data register (D)
740
Mnemonic
16-bit Instruction
11 steps RBFM
Unit number [0 to 7]
Head buffer memory (BFM) number [0 to 32766]
Head device number storing data to be read from buffer memory (BFM)
Number of all buffer memories (BFM) to be read [1 to 32767]
Number of points transferred in one operation cycle [1 to 32767]
Digit Specification
31 Data Transfer 3 – FNC275 to FNC279
31.1 FNC278 – RBFM / Divided BFM Read
→ For FROM (FNC 78) instruction, refer to Section 15.9.
Operation Condition
32-bit Instruction
Continuous
Operation
Description
Word Devices
Special
System User
Unit
V Z Modify K H
Mnemonic Operation Condition
−
Data Type
16-bit binary data
Others
Con- Real Charac-
Index
stant Number ter String
E " "
Pointer
P