Mitsubishi FX3G Series Programming Manual

693
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
31 Data Transfer 3 – FNC276 to FNC279
31.1 FNC278 – RBFM / Divided BFM Read
31
FNC276-FNC279 Data Transfer 3
32
FNC280-FNC289 High-Speed Processing 2
33
FNC290-FNC299 Extension File Register
34
FNC300-FNC305 FX
3U
-CF-ADP
35
SFC•STL Programming
36
Interrupt Function
37
Special Device
38
Error Code
A
Version Up Information
B
Execution Times
Related devices
→ For the flag use methods for instruction execution complete and instruction execution
abnormally complete, refer to Subsection 6.5.2.
Related instructions
Errors
An operation error is caused in the following case; The error flag M8067 turns ON, and the error code is stored in
D8067.
• When the unit number "m1" does not exist (error code: K6708)
31.1.1 Common items between RBFM (FNC278) instruction and WBFM (FNC279) instruction
Specification of unit number of special function block/unit and buffer memory
→ For the connection method of special extension units/blocks,
number of connectable units/blocks, and handling of I/O numbers,
refer to the manual of the PLC used and special function block/unit.
1. Unit number "m1" of a special extension unit/block
Use the unit number to specify to which equipment the RBFM/WBFM instruction works.
Setting range: K0 to K7
A unit number is automatically assigned to each special extension unit/block connected to the PLC.
The unit number is assigned in the way "No. 0 → No. 1 → No. 2 ..." starting from the equipment nearest the main unit.
When the main unit is the FX
3UC-32MT-LT(-2), the unit number is assigned in the way "No. 1 → No. 2 → No. 3 ..."
starting from the equipment nearest to the main unit because the CC-Link/LT master is built into the FX3UC-32MT-LT
(-2).
2. Buffer memory (BFM) number "m2"
Up to 32767 16-bit RAM memories are built in a special extension unit/block, and they are called buffer memories.
The buffer memory number is from "0" to "32766", and the contents are determined according to each special function
unit/block.
Setting range: K0 to K32766
→ For the contents of buffer memories, refer to the manual of the special function block/unit used.
Device Name Description
M8029 Instruction execution complete Turns ON when an instruction is finished normally.
M8328 Instruction non-execution
Turns ON when RBFM (FNC278) or WBFM (FNC279) instruction in
another step is executed for the same unit number.
M8329 Instruction execution abnormally complete Turns ON when an instruction is finished abnormally.
Instruction Description
FROM(FNC 78) Read from a special function block
TO(FNC 79) Write to a special function block
WBFM(FNC279) Divided BFM write
FX3UC-
32MT-LT
(-2)
main unit
Unit No. 0
Built-in
CC-Link/LT
I/O
extension
block
Special
extension
block
Special
extension
block
Special
extension
block
I/O
extension
block
Unit
No. 1
Unit
No. 2
Unit
No. 3

Mitsubishi FX3G Series Specifications

General

Model	FX3G Series
Power Supply	AC 100-240V or DC 24V
Program Capacity	32, 000 steps
Execution Speed	0.21 µs/basic instruction
Communication Options	RS-422, USB, Ethernet
Expansion Modules	Analog, digital, communication
Programming Language	Ladder Logic, Instruction List
Built-in Functions	High-speed counters, pulse output
Analog I/O	Available via expansion modules