FX
2N
-32CCL CC-Link Interface Block
Assignment of Buffer Memory (BFM) 5
5-1
5.
Assignment of Buffer Memory (BFM)
5.1
Outline of data communication
The interface block FX
2N
-32CCL transfers data between the master station in the CC-Link via the built-in
buffer memory (BFM) backed up by the 16-bit RAM memory. This buffer memory consists of memory dedi-
cated to write and memory dedicated to read. Numbers of #0 to #31 are assigned respectively to each type of
buffer memory.
By writing data from the FX PC to the memory dedicated to write using a TO instruction, the data can be sent
to the master station. The data sent from the master station is read from the memory dedicated to read to the
FX PC using a FROM instruction.
Flow of data
FX
0N
, FX
2N
, FX
2NC
PC
Internal relay,
I/O relay, etc.
TO instruction
FROM instruction
Buffer memory for I/O
Dedicated to write
BFM #0 to BFM #7
(RX00 to RX7F)
Dedicated to read
BFM #0 to BFM #7
(RY00 to RY7F)
Data (word)
device, etc.
Buffer memory for data
FX
2N
-32CCL
TO instruction
FROM instruction
Master unit
Remote input
(RX)
Remote register
(RWr)
Link scan
Link scan
Link scan
Link scan
Remote output
(RY)
Remote register
(RWw)
Dedicated to write
BFM #8 to BFM #23
(RWr0 to F)
Dedicated to read
BFM #8 to BFM #23
(RWw0 to F)
Remote device station
Master station
Summary of Contents for FX2N-32CCL
Page 1: ...USER S MANUAL CC Link INTERFACE BLOCK FX2N 32CCL ...
Page 18: ...FX2N 32CCL CC Link Interface Block Specifications 2 2 6 Memo ...
Page 26: ...FX2N 32CCL CC Link Interface Block Setting of Remote Device Stations 4 4 4 Memo ...
Page 39: ...FX2N 32CCL CC Link Interface Block Assignment of Buffer Memory BFM 5 5 13 ...
Page 54: ...FX2N 32CCL CC Link Interface Block Programming Examples 6 6 14 Memo ...
