Mitsubishi MELSEC-F User Manual page 96

5 COMMUNICATION PROCEDURE
PLC main unit
Initial completion
Active open
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(1) Protocol
(connection numbers 1 to 8; BFM#32 to 39 b8)
(a) Select the protocol for each connection.
Name of setting
TCP Communicate using TCP/IP.
UDP Communicate using UDP/IP.
(b) For protocols (TCP/UDP), see 1.3, "Software Configuration".
(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.
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 4.7),
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 made MC protocol operational
Ethernet module
Initial request
FROM instruction
Initial completion
TO instruction
Fullpass ive/
Unpassove
open
Wait for open
FROM instruction
request
Open completion
Ethernet module
Initial request
Initial completion
Open
Open request
Open completion
Description of setting
Description of setting
PLC main unit
FROM instruction
Active open
FROM instruction
MELSEC-F
4
Initial completion
Open completion
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