310
FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
9 CC-Link/LT Built-in master ability (Only FX3UC-32MT-LT)
9.18 Details of buffer memory
FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
9.18 Details of buffer memory
9.18.1 Remote station connection information [BFM #0 (0h) to #3 (3h)]
1. Detailed description
The connection status of remote stations connected in the system are stored in BFM #0 to BFM #3 (bits for
connected stations are ON).
0 (OFF): Corresponding remote station is not connected.
1 (ON): Corresponding remote station is connected.
2. Cautions on use
Once a bit for a remote station turns ON, it remains ON even if a communication error occurs in the remote
station due to wire breakage, etc. (this information cannot be used to confirm the communication).
9.18.2 Link error station information [BFM #4 (4h) to #7 (7h)]
The data link status of remote stations is stored here (bits for stations with link error are ON).
1. Detailed description
Among remote stations whose I/O numbers are written in the EEPROM (e.g. remote stations connected in the
CONFIG mode or remote stations whose information is written by editing 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
of these bits is cleared.
The station number 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.
1 (ON): Data link error has occurred in the station.
2. Cautions on use
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).
Buffer
memory No.
Bit
b15 b14 b13 ••• b2 b1 b0
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
Buffer
memory No.
Bit
b15 b14 b13 ••• b2 b1 b0
BFM #4 (0h) Station No.16 Station No.15 Station No.14 ••• Station No.3 Station No.2 Station No.1
BFM #5 (1h) Station No.32 Station No.31 Station No.30 ••• Station No.19 Station No.18 Station No.17
BFM #6 (2h) Station No.48 Station No.47 Station No.46 ••• Station No.35 Station No.34 Station No.33
BFM #7 (3h) Station No.64 Station No.63 Station No.62 ••• Station No.51 Station No.50 Station No.49
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