G–4 Communicating with Devices on an Ethernet Network
Publication
1747-6.2
TCP/IP is the mechanism used to transport Ethernet messages. On
top of TCP, the Client/Server Protocol is required to establish
sessions and to send the MSG commands. Connections can be
initiated by either a client program (INTERCHANGE or RSLinx
application) or a processor.
The client program or processor must first establish a connection to
the SLC 5/05 to enable the SLC 5/05 to receive solicited messages
from a client program or another processor. The client program must
also establish a connection to the SLC 5/05 to enable the SLC 5/05
to send unsolicited messages to a client program.
In order to send a peer message, the SLC 5/05 must first establish a
connection with the destination node at a specified IP address on the
Ethernet network. A connection is established when a MSG
instruction executes and no previous connection exists.
When a MSG instruction executes, the SLC 5/05 checks to see
whether a connection has been established with the destination node.
If a connection has not been established, the SLC 5/05 attempts to
establish a connection of the peer type.
The SLC 5/05 supports a maximum of 16 connections, allowing
simultaneous communication with up to 16 other devices or
applications. The connections are dedicated as follows:
Number of Connections
➀
Dedicated to:
4 peer messages
4 client messages
8 either peer or client messages
➀
Connections
established by an INTERCHANGE client, RSLinx client, RSLogix 500, and peers are
all included when counting the number of connections.
Important: For peer connections, no more that one connection per
destination node is established. If multiple MSG
instructions use the same destination node, they share
the same connection.
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