Mitsubishi FX3U Series Programming Manual

441
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.9 FNC 78 – FROM / Read From A Special Function Block
11
FNC30-FNC39 Rotation and Shift
12
FNC40-FNC49 Data Operation
13
FNC50-FNC59 High-Speed Processing
14
FMC60-FNC69 Handy Instruction
15
FNC70-FNC79 External FX I/O Device
16
FNC80-FNC89 External FX Device
17
FNC100-FNC109 Data Transfer 2
18
FNC110-FNC139 Floating Point
19
FNC140-FNC149 Data Operation 2
20
FNC150-FNC159 Positioning Control
15.9 FNC 78 – FROM / Read From A Special Function Block
Outline
This instruction reads the contents of buffer memories (BMF) in a special function unit/block attached to a PLC.
When a large capacity of buffer memory (BFM) data is read by this instruction, a watchdog timer error may occur.
When bad effect is not given to the control even if data to be read is divided, use RBFM (FNC278) instruction.
→ For RBFM (FNC278) instruction, refer to Section 31.1.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (FROM and FROMP)
→ For the common items between FROM instruction and TO instruction,
refer to Subsection 15.9.1.
Special extension unit/block (BFM) → PLC (word device)
"n"-point 16-bit data starting from the buffer memory (BFM) # m2 inside a special function unit/block No. m1 are
transferred (read) to "n"-point 16-bit data starting from inside a PLC.
Operand Type Description Data Type
m1
Unit number of a special extension unit/block
(K0 to K7 from the right side of the main unit)
16- or 32-bit binary
m2 Transfer source buffer memory (BFM) number 16- or 32-bit binary
Transfer destination device number 16- or 32-bit binary
n Number of transfer points 16- or 32-bit binary
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 V Z Modify K H E "  "P
m1 33 33
m2 33 33
3333333 333
n 33 33
P
FNC 78
FROM
D
16-bit Instruction
9 steps
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
FROM
FROMP
DFROM
DFROMP
Mnemonic Operation Condition
32-bit Instruction
17 steps
Continuous
Operation
Pulse (Single)
Operation
D
D
D
Command
input
FNC 78
FROM
m1 m2 n
Unit No.
m1 = 0 to 7
Transfer source BFM #
(Special extension unit/block)
m2 = 0 to 32766
Transfer destination (PLC)
Number of transfer points
n = 1 to 32767
D 

Mitsubishi FX3U Series Specifications

General

Brand	Mitsubishi
Model	FX3U Series
Category	Controller
Language	English