Mitsubishi Electric FX3U-ENET User Manual page 92

5 COMMUNICATION PROCEDURE
PLC main unit
Initial completion
Fullpassive/
Unpassive
open
Active open
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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.
Name of setting
Perform active open processing to an external device that waits for a passive open
Active
(Fullpassive/Unpassive) on the TCP connection.
Perform passive open processing on the TCP connection addressing all the devices connected
Unpassive to a network.
(The local station is placed in the wait status to wait for an Active open request to be sent.
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.)
Fullpassive
The local station waits for an Active open request from the opposite station set in "(8)
Destination IP address".
Used to connect MELSOFT products via TCP/IP communication (through the in-house LAN,
etc. ).
MELSOFT connection
Perform passive open processing on the TCP connection, addressing all the MELSOFT
*1*2*3
products connected to a network.
(The local station is placed in the wait status for an Active open request to be sent.)
*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].
The number of connections to MELSOFT products +
Number of connections which have MC protocol operational
Ethernet module
Initial request
FROM instruction
Initial completion
TO instruction
Open
Wait for open
FROM instruction
request
Open completion
Description of setting
Ethernet module
Initial request
FROM instruction
Initial completion
Active open
Open request
FROM instruction
Open completion
MELSEC-F
PLC main unit
Initial completion
Open completion
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