Mitsubishi MELSEC iQ-F FX5 series User Manual

14 DIVIDED DATA READ/WRITE FROM/TO BFM INSTRUCTION
14.2 Divided BFM write
687
14
14.2 Divided BFM write
WBFM
This instruction writes data to continuous buffer memory areas in an FX3 series intelligent function module.
Setting data
■Descriptions, ranges, and data types
■Applicable devices
Processing details
• This instruction writes (n1) points of buffer memory starting from (s1) inside the intelligent function module number (U/H) to
(s2) in the CPU module. When (n1) exceeds 64 points, it divides and writes by several scans. (64 points are read in one
scan)
• When this instruction is finished normally, instruction execution complete flag (SM8029) turns on. When this instruction is
finished abnormally, instruction execution abnormal end flag (SM8329) turns on.
• When this instruction or the RBFM instruction is executed in the same scan, instruction non-execution flag (SM8328) is set
to on, and execution of such an instruction is paused. When execution of the other target instruction is complete, the
paused instruction resumes.
Ladder diagram Structured text
ENO:=WBFM(EN,UnHn,s1,s2,n1,n2);
Operand Description Range Data type Data type (label)
(U/H) Module number K1 to 16 16-bit unsigned binary ANY16_U
(s1) Head buffer memory number 0 to 32767 16-bit unsigned binary ANY16_U
(s2) Head device number storing data to be written to buffer memory  16-bit signed binary ANY16
(n1) Number of all buffer memory areas to be written 1 to 32768 16-bit unsigned binary ANY16_U
(n2) Not used  16-bit unsigned binary ANY16_U
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB
U\G T, ST,
C, LC
T, ST, C, D,
W, SD, SW, R
U\G Z LC LZ K, H E $
(U/H)       
(s1)       
(s2)       
(n1)       
(n2)       
(U/H) (s1) (n1)(s2) (n2)
M
SM8029
WBFM
(U/H)
(s1) (n1) (n2)
SM8328
M
BFM#(s1)
BFM#((s1)+(n1)-1)
(s2)+(n1)-1
SM8329
M
(s2)
(s2)
Instruction execution complete flag
Instruction non-execution flag
Module number (U/H)CPU module
Write
Instruction execution abnormal end flag
Command
input

Mitsubishi MELSEC iQ-F FX5 series Specifications

General

Series	MELSEC iQ-F
Communication Interfaces	Ethernet, RS-485, USB
Type	Programmable Logic Controller (PLC)
I/O Points	Up to 256 points (depends on configuration)
Built-in I/O	Varies depending on CPU type (e.g., 16, 32, 64)
Programming Language	Ladder Logic, Structured Text, Function Block Diagram, Instruction List, Sequential Function Chart
Communication Protocols	Ethernet, Modbus RTU/ASCII, Modbus TCP, CC-Link IE Field Basic
Expansion Modules	Digital I/O, Analog I/O, Communication
Power Supply	24 V DC or 100-240 V AC (depending on model)
Ethernet Port	1 port (10/100BASE-TX)
RS-485 Port	1 port (depends on model)
USB Port	1 port (USB 2.0)
High-speed Counter	Up to 200 kHz (depends on model)
Pulse Output	Up to 200 kHz (depends on model)
Operating Temperature	0°C to 55°C
Storage Temperature	-25°C to 75°C

Summary

SAFETY PRECAUTIONS

INTRODUCTION

Regarding use of this product

Details on the general purpose and specific application considerations for the product.

Note

Important notes regarding installation, operation, manual usage, and potential changes to the manual's content.

PART 1 OVERVIEW

CHAPTER 1 OVERVIEW

Provides a general overview of the CPU module, including instruction configuration, data specification, and execution conditions.

1.1 Instruction Configuration

Explains the structure of instructions, defining instruction and device parts, and detailing source, destination, and numerical data.

1.2 Data Specification Method

Details the various data types usable in CPU modules, including bit, word, double word, and real number data.

1.3 Execution Condition

Describes the five types of execution conditions for instructions: On, Rising edge, Off, Falling edge, and Always.

1.4 Precautions on Programming

Covers common errors, range checks for devices and labels, and operations arising from simultaneous use of instructions.

PART 2 INSTRUCTION/FUNCTION LIST

CHAPTER 2 CPU MODULE INSTRUCTION

Details instructions related to the CPU module, categorized into Sequence, Basic, Module Specific, and Built-in Ethernet.

CHAPTER 3 MODULE SPECIFIC INSTRUCTION

Covers instructions specific to various hardware modules like High-speed Counter, External Device I/O, and Inverter Communication.

CHAPTER 4 STANDARD FUNCTIONS/FUNCTION BLOCKS

Explains standard functions and function blocks, including type conversion, arithmetic operations, and bit shift functions.

PART 3 CPU MODULE INSTRUCTIONS

5 SEQUENCE INSTRUCTIONS

Details sequence instructions including contact, association, output, shift, and master control instructions.

6 BASIC INSTRUCTIONS

Covers fundamental instructions such as comparison, arithmetic, logical, bit processing, data conversion, and data transfer.

7 APPLICATION INSTRUCTION

Explains application-specific instructions like rotation, program branch, execution control, structuring, data table, character string, and real number instructions.

PART 4 MODULE DEDICATED INSTRUCTION

9 HIGH-SPEED COUNTER INSTRUCTION

Details instructions for high-speed processing, including 32-bit data comparison and current value transfer.

10 EXTERNAL DEVICE I/O INSTRUCTION

Covers instructions related to external device communication, specifically Serial Communication 2.

11 POSITIONING INSTRUCTION

Explains instructions for positioning control, including zero return, interrupt positioning, and table operations.

12 INVERTER COMMUNICATION INSTRUCTION

Details instructions for inverter communication, including operation monitoring, parameter read/write, and multi-command.

13 MODBUS COMMUNICATION INSTRUCTION

Covers instructions for MODBUS communication, specifically MODBUS Read/Write.

14 DIVIDED DATA READ/WRITE FROM/TO BFM INSTRUCTION

Explains instructions for divided data read and write operations with BFM.

PART 5 STANDARD FUNCTIONS

CHAPTER 15 TYPE CONVERSION FUNCTIONS

Details various type conversion functions, including BOOL to WORD/DWORD, INT/DINT, TIME, STRING, BCD, REAL, and BIT Array.

CHAPTER 16 SINGLE NUMBER VARIABLE FUNCTIONS

Explains functions operating on single numeric variables like Absolute Value, Square Root, Logarithms, and Trigonometric functions.

CHAPTER 17 ARITHMETIC OPERATION FUNCTIONS

Covers arithmetic functions such as Addition, Multiplication, Subtraction, Division, Remainder, Exponentiation, and Move Operation.

CHAPTER 18 BIT SHIFT FUNCTIONS

Details functions related to bit shifting and rotation, including n-bit shifts and rotations for WORD/DWORD data.

CHAPTER 19 STANDARD BITWISE BOOLEAN FUNCTIONS

Explains standard bitwise operations like AND, OR, XOR, and Logical Negation.

CHAPTER 20 SELECTION FUNCTIONS

Covers selection functions such as Selection (MUX), Maximum/Minimum Value selection, and Limit Control.

CHAPTER 21 COMPARISON FUNCTIONS

Details comparison functions like Compare (GT, GE, EQ, LE, LT, NE) for various data types.

CHAPTER 22 CHARACTER STRING FUNCTIONS

Explains functions for character string manipulation, including length detection, extraction, insertion, deletion, replacement, and searching.

CHAPTER 23 TIME DATA FUNCTIONS

Covers functions related to time data manipulation, including Addition, Subtraction, Multiplication, and Division.