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MELSEC-F
COMMUNICATION PROCEDURE5
5 - 20
(4) Fixed buffer communication
(connection numbers 1, 2; BFM#32, 33 b9 to b10)
(a) For this item, select the communication method when communicating using
the fixed buffers.
(5) Pairing open
(connection numbers 1 only; BFM#32 b7)
(a) Select whether or not the Ethernet module's receiving and sending
connections are made into one pair and connected to one port of an external
device when using fixed buffer communication (Either one among
[Procedure exist] or [No procedure] can be specified).
For more detail, see [Section 5.7 Pairing Open].
(b) "Pairs" can be selected only in connection No. 1.
If "Pairs" is selected in connection No. 2, an error will occur when the
connections are opened.
• Error information is stored in the error log area (BFM#227 to 511) in the
buffer memory.
• The open error code is stored in BFM#134.
Name of setting Description of setting
Procedure exist
• In fixed buffer communication, data is communicated in 1:1 by handshaking with the
external device.
No procedure
• The no procedure fixed buffer communication uses dedicated connections.
• The PLC and external devices communicate data in 1:1
• The handshaking with an external device must be performed using a sequence program.
Name of setting Description of setting
No pairs Does not use the pairing open method.
Pairs Uses the pairing open method.