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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.10 FNC 79 – TO / Write To A Special Function Block
2. 32-bit operation (DTO and DTOP)
PLC (word device) → Special extension unit/block (BFM)
"n"-point 32-bit data starting from [ , +1] inside a PLC are transferred (written) to "n"-point buffer memories
starting from the buffer memory (BFM) # [m2+1, m2] inside a special extension unit/block No. m1.
Related devices
Cautions
• Digit specification in bit device
For the 16-bit operation instruction, specify K1 to K4. For the 32-bit operation instruction, specify K1 to K8.
• Note that the 32-bit values [m1+1, 1], [m2+1, m2] and [n+1, n] are valid when D or R is specified as "m1", "m2" or
"n" in a 32-bit instruction.
In the case of "DTO D0 D2 D100 R0", "m1" is [D1, D0], "m2" is [D3, D2], and "n" is [R1, R0].
Program examples
In programs, the contents of data registers (D), extension registers (R), auxiliary relays (M) with digit specification and
constants (K and H) are written (transferred) to buffer memories (BFMs) in special extension units/blocks using the TO
instruction and direct specification of buffer memories
*1
.
*1. This function is supported only in FX
3U/FX3UC PLCs.
Example: When writing "H0" to the BFM #27 (command) in the CC-Link/LT master unit (whose unit number is fixed to
"0") built in the FX
3UC-32MT-LT(-2)
-In case of TO instruction
-In case of MOV instruction
Device Name Description
M8028 Enable interrupt flag
Disables or enables interrupts while FROM/TO instruction is executed.
→ For details, refer to "Acceptance of interrupt while FROM/TO instruction is executed
(M8028)" in Subsection 15.9.1.
OFF: Disables interrupts.
(Interrupts are executed after FROM/TO instruction is executed.)
ON: Enables interrupts.
S
S
Command
input
FNC 79
DTO
m1 m2 n
Unit No.
m1 = 0 to 7
Transfer destination (Special
extension unit/block) BFM #
m2 = 0 to 32765
Transfer source (PLC)
Number of transfer points
n = 1 to 16383
S
S
M1
Unit
No. 0
BFM #27 Transfer
source
data
Number of
Transfer
points
FNC 79
TOP
K0 K27 H0 K1
M1
Transfer
source
data
Unit No. 0
BFM #27
FNC 12
MOVP
H0 U0\G27