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MELSEC-F
COMMUNICATION PROCEDURE5
5 - 21
(5) Pairing open
(connection numbers 1 to 8; BFM#32 to 39 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], [Procedure exist (MC)] or [No procedure] can be
specified).
For more detail, see [Section 5.7 Pairing Open].
(6) Existence confirmation
(connection numbers 1 to 8; BFM#32 to 39 b1)
(a) This setting selects whether or not the Ethernet module should confirm that
an external device still operates normally when there is no communication
for a fixed period of time. The open processing for the connection with the
external device must have been completed.
(b) When an error occurs in the existence confirmation, the Ethernet module
performs the following processing.
• Forcibly closes the line and stores the error information in the error log
area (BFM#227 to 511) of the buffer memory.
• Turns off the open completion signal (BFM#20480) and stores the open
error code in BFM#124, 134, 144, 154, 164, 174, 184, 194.
(c) If the external device will be changed while a UDP/IP connection is open,
"No confirm" should be selected.
If "Confirm" is selected, the Ethernet module will confirm the existence of the
first destination after the UDP/IP connection is opened. Existence
confirmation is not performed for the changed destination, i.e. the newly
selected external device.
Name of setting Description of setting
No pairs Does not use the pairing open method.
Pairs Uses the pairing open method.
Name of setting Description of setting
No confirm Do not confirm the existence of the external device.
Confirm
Confirm the existence of the external device.
For details on the settings of the existence confirmation time and others, see Section 5.2,
"Initial Settings".