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MELSEC-F
COMMUNICATION PROCEDURE5
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(2) Open system
(connection numbers 1 to 8; BFM#32 to 39 b15, b14)
(a) Select the connection open system for each connection for which "TCP" is
selected in "(1) Protocol". If "UDP" is selected, the specification of this item is
not required.
*1 Regardless of the initial timing setting in the operation setting (refer to
Section 4.6), this connection will always wait for the open status.
*2 The set connection is dedicated to data communication with the
MELSOFT products.
*3 When simultaneously connecting to multiple MELSOFT products, set
the connections to be as many as there are MELSOFT products.
A maximum of four connections can be set. However, when setting
[Usable] in the open settings for [MC Protocol], the number of usable
connections decrease by the number set in [MC Protocol].
Name of setting Description of setting
Active
Perform active open processing to an external device that waits for a passive open
(Fullpassive/Unpassive) on the TCP connection.
Unpassive
Perform passive open processing on the TCP connection addressing all the devices connected
to a network.
(The local station is placed in the wait status to wait for an Active open request to be sent.
Fullpassive
Perform passive open processing on the TCP connection, only addressing specific devices.
(The local station is placed in the wait status to wait for an Active open request to be sent.)
The local station waits for an Active open request from the opposite station set in "(8)
Destination IP address".
MELSOFT connection
*1*2*3
Used to connect MELSOFT products via TCP/IP communication (through the in-house LAN,
etc. ).
Perform passive open processing on the TCP connection, addressing all the MELSOFT
products connected to a network.
(The local station is placed in the wait status for an Active open request to be sent.)
The number of connections to MELSOFT products +
Number of connections which have MC protocol operational 4
PLC main unit
PLC main unit
Initial completion
Active open
Fullpassive/
Unpassive
open
Initial completion
Open completion
Active open
Ethernet module
Ethernet module
Initial request
Initial completion
Open request
Open completion
Initial request
Initial completion
Open completion
Open
Wait for open
request
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