C - 1761-net-eni/eniw performance considerations, Ethernet/ip connections, Appendix c – Rockwell Automation 1761-NET-ENIW MicroLogix Ethernet Interface (ENI) User Manual User Manual
Page 133: 1761-net-eni/eniw performance considerations
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Publication 1761-UM006E-EN-P - August 2005
Appendix
C
1761-NET-ENI/ENIW Performance
Considerations
Ethernet/IP Connections
The ENI/ENIW supports 6 concurrent TCP/IP connections: 2
incoming, 2 outgoing and 2 that can be allocated as incoming or
outgoing. Connection use can be viewed on the Diagnostics tab of the
ENI/ENIW web page (series D only).
Each TCP/IP connection simultaneously supports up to:
• 4 CIP connections
• 5 Unconnected sends
Packet Size Limitations
Each TCP/IP connection has its own DF1 queue. Each DF1 queue has
10 message buffers. The size of each message buffer is 580 bytes.
Using SLC-type reads, the following array sizes can be read over
Ethernet via the ENI/ENIW using the RSLinx OPC Test Client:
• MicroLogix - 248 bytes of data
• SLC 500 - 236 bytes of data
• CompactLogix - 250 bytes of data
These limitations are due to serial port packet size limitations of the
respective controllers, not the ENI/ENIW.