432
FX
3U
/FX
3UC
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
1. 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.
Program examples
In programs, the contents of data registers (D), extension registers (R), auxiliary relays (M) with digit
specification, or constants (K, H) are written (transferred) to buffer memories in a special extension unit/block
using an applied instruction such as TO, MOV and BMOV.
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
- 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 the 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 source BFM #
m2 = 0 to 32765
Transfer destination
Number of transfer points
n = 1 to 16383
S
S
M1
Unit
No. 0
BFM #27
Transfer
source
data
Transfer
destination
FNC 79
TOP
K0
K27
H0
K1
M1
Transfer
source
data
Unit No. 0
BFM #27
FNC 12
MOVP
H0
U0\G27