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FX2N-64CL-M CC-Link/LT Master Block Model
10.2
Details of buffer memory
10.2.1
Remote station connection information [BFM #0 (0h) to #3 (3h)]
The connection status of remote stations connected in the system are stored in BFM #0 to
BFM #3 (bits for connected stations are ON).
Once a bit for a remote station turns ON, it remains ON even if communication error occurs in
the remote station due to wire breakage, etc (this information cannot be used to confirm the
communication).
The station No. of each remote station is assigned to each bit of the buffer memory [BFM #0
(0h) to #3 (3h)]. Connection/disconnection is indicated by the 0 (OFF)/1 (ON) status of each
bit.
0 (OFF): Corresponding remote station is not connected.
1 (ON): Corresponding remote station is connected.
Buffer
memory No.
BFM #0 (0h) Station No.16 Station No.15 Station No.14 ••• Station No.3 Station No.2 Station No.1
BFM #1 (1h) Station No.32 Station No.31 Station No.30 ••• Station No.19 Station No.18 Station No.17
BFM #2 (2h) Station No.48 Station No.47 Station No.46 ••• Station No.35 Station No.34 Station No.33
BFM #3 (3h) Station No.64 Station No.63 Station No.62 ••• Station No.51 Station No.50 Station No.49
10.2.2
Link error station information [BFM #4 (4h) to #7 (7h)]
The data link status of remote stations is stored here (bits for stations having link error are
ON).
Among remote stations whose I/O Nos. are written in the EEPROM (e.g. remote stations
connected in the CONFIG mode or remote stations whose information is written by editing of
the detailed remote station information), remote stations with which communication is disabled
are regarded as data link error stations, and corresponding bits are set to ON. When
communication with a remote station is restored, the ON status is cleared.
However, unused stations and reserved stations are not regarded as data link error stations.
If a remote station whose parameters are not written in the EEPROM gives a response, it is
regarded as control disability (due to I/O non-assignment), and regarded as a data link error.
Inconsistency of the station type is not checked (even if the station type is inconsistent, it is not
regarded as data link error).
The station No. of each remote station is assigned to each bit of the buffer memory [BFM #4
(4h) to #7 (7h)]. Normal status/data link error is indicated by the 0 (OFF)/1 (ON) status of each
bit.
0 (OFF): The station is normal.
Buffer
memory No.
BFM #4 (4h) Station No.16 Station No.15 Station No.14 ••• Station No.3 Station No.2 Station No.1
BFM #5 (5h) Station No.32 Station No.31 Station No.30 ••• Station No.19 Station No.18 Station No.17
BFM #6 (6h) Station No.48 Station No.47 Station No.46 ••• Station No.35 Station No.34 Station No.33
BFM #7 (7h) Station No.64 Station No.63 Station No.62 ••• Station No.51 Station No.50 Station No.49
b15
b14
b15
b14
Bit
b13
•••
b2
1 (ON): Data link error has occurred in the station.
Bit
b13
•••
b2
Assignment of Buffer Memory 10
b1
b1
10-2
b0
b0
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