From (Fnc 78) - Mitsubishi FX1S Series Programming Manual

FX Series Programmable Controlers
5.8.9

FROM (FNC 78)

Mnemonic
FROM
FNC 78
(FROM)
16 BIT OPERATION
position specified as m
devices.
Points to note:
a) All special function blocks which are addressable with the FROM/TO instructions are
connected to the extension bus on the right hand side of the PLC. Each special function
block can be inserted at any point within the chain of extended units (as long as the system
configuration rules are not broken). Each special function block is consecutively addressed
from 0 to 7 beginning with the one closest to the base unit.
b) Each special function unit has different buffer memory registers. These often have a
dedicated use for each individual unit. Before any reading or writing of data is undertaken
ensure that the correct buffer memory allocations for the unit used are known.
m : This defines the head address of the (special function blocks) buffer memories being
2
accessed. m
n: This identifies the number of words which are to be transferred between the special
function block and the PLC base unit. n may have a value of 1 to 31 for 16 bit operation but
a range of 1 to 16 is available for 32 bit operation.
c) The destination head address for the data read FROM the special function block is
specified under the D operand; and will occupy n further devices.
d) This instruction will only operate when the drive input is energized.
Function
Read data from
K, H
the buffer
Note:
memories of
m = 0 to 7
1
attached special
function blocks
32 BIT OPERATION
The read data is stored in the PLC at head address D for n word
1,
FX-4AD
POWER
may have a value from the range 0 to 31.
2
Operands
m m
1 2
) )
KnY, KnM,
K, H
KnS, T, C,
Note:
D, V, Z
m = FX
2 (2C)
0 to 31,
FX 0 to
2N
32767
Operation:
The FROM instruction reads n words of data
starting from the buffer memory address m
special function block with the logical block
FX-8EYT FX-1HC
POWER POWER
Applied Instructions 5
FX
FX
1S 1N
Program steps
D n
)
FROM,
K, H
FROMP:
Note:
9 steps
16 bit op:
DFROM,
n= 1 to 32
DFROMP:
32 bit op:
17 steps
n= 1 to 16
PULSE-P
FX-2DA
POWER
FX FX
2N 2NC
of the
2
5-112