Rockwell Automation 1785-ENET PLC-5 Ethernet Interface Module Installation Instructions - Manual (Page 14)

14 PLC-5 Ethernet Interface Module
Publication 1785-IN019B-EN-P - January 2007
The additional diagnostics are available for use within a user program as words 44...49 of the
Ethernet diagnostic file:
Words 45...47 contain the six-digit Ethernet hardware address. For example, if the Ethernet
hardware address is 00:00:BC:03:00:1D, words 45...47 would contain
000 BC03 001D.
Words 48 and 49 contain 4 bytes of data, with each byte holding one of the numbers of the
address, in hex, in the dot-address format. For example, an IP address of 142.169.124.1 will
be displayed as 8EA9 7C01.
To access these additional words, you must create the diagnostic file in the channel
configuration and manually expand the data table file from 44 to 50 words.
Multihop Messaging Over the Ethernet Network
This lets you communicate over the Ethernet network with ControlLogix devices or through
a ControlLogix Ethernet module (1756-ENET) to other PLC-5 and SLC controllers. You
need a series E, revision D or later, PLC-5 controller with a series B, or later, 1785-ENET
interface module. Keep in mind these considerations:
• RSLogix programming software on ControlNet and DH+ links cannot see the
controllers on an Ethernet link.
• The RSLinx DDE server on a ControlNet link cannot poll data from the controllers
on an Ethernet link.
• The RSLinx DDE server on a ControlNet link cannot accept unsolicited data from
controllers on an Ethernet link.
• Applications that register themselves as nodes on the RSLinx Virtual Link in
workstations on the ControlNet network cannot accept unsolicited packets from
controllers on the Ethernet network.
• Applications that register themselves as nodes on the RSLinx Virtual Link in
workstations on an Ethernet link cannot accept unsolicited packets from the
controllers on an Ethernet link.
When an outbound connection's inactivity timer has expired and a MSG is pending on that
connection, the MSG receives an error. On a multihop connection, the error is 0x18 (Broken
Connection). On a non-multihop connection, the error is 0x16 (Connection Timeout).
For non-multihop connections, the Connection Inactivity Timeout is user configurable. For
multihop connections, it is not configurable. Instead, it uses a default timeout value of 17
seconds.
Word Displays
44 Not used
45...47 Ethernet hardware address
48...49 Assigned Internet protocol (IP) ddress