Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual User Manual
Page 241
Publication 1747-UM011G-EN-P - June 2008
Communicating with Devices on an Ethernet Network 241
In order to send an outgoing message, the SLC 5/05 processor 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 processor checks to
see whether a connection has been established with the destination
node. If a connection has not been established, the SLC 5/05
processor attempts to establish a connection of the peer type.
In order to receive messages from another device on Ethernet, an
incoming connection must be established. This incoming connection
is made by the sending processor and uses one incoming connection
in the receiving processor.
The SLC 5/05 processor supports a maximum of 32 connections for
the 1747-L551 processor, and 48 connections for 1747-L552 and 64
connections for 1747-L553 processor, allowing simultaneous
communication with up to 64 other devices or applications.
Connections
Configuring the Ethernet
Channel on the SLC 5/05
Processor
There are two ways to configure the SLC 5/05 Ethernet channel 1. The
configuration can be done via a BOOTP/DHCP request at processor
powerup, or by manually setting the configuration parameters by
using RSLogix 500 programming software. The configuration
parameters are shown on page 242.
Number of Connections
(1)
(1)
Connections established by an INTERCHANGE client, RSLinx client, and peers are all included when
counting the number of connections.
Dedicated to
4
outgoing connections
4
incoming connections
24
(2)
, 40
(3)
, or 56
(4)
(2)
1747-L551 processor.
(3)
1747-L552 processor.
(4)
1747-L553 processor.
either incoming or outgoing connections
IMPORTANT
For outgoing 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.