ProSoft Technology MVI56E-MNETR - Manual (Page 118)

MVI56E-MNETR ♦ ControlLogix Platform Reference
Modbus TCP/IP Interface Module with Reduced Data Block User Manual
Page 118 of 153
ProSoft Technology, Inc.
August 31, 2009
5.3 Ethernet Cable Specifications
The recommended cable is Category 5 or better. A Category 5 cable has four
twisted pairs of wire, which are color-coded and cannot be swapped. The module
uses only two of the four pairs.
The Ethernet port on the module is Auto-Sensing. You can use either a standard
Ethernet straight-through cable or a crossover cable when connecting the
module to an Ethernet hub, a 10/100 Base-T Ethernet switch, or directly to a PC.
The module will detect the cable type and use the appropriate pins to send and
receive Ethernet signals.
Ethernet cabling is like U.S. telephone cables, except that it has eight
conductors. Some hubs have one input that can accept either a straight-through
or crossover cable, depending on a switch position. In this case, you must ensure
that the switch position and cable type agree.
Refer to Ethernet cable configuration (page 118) for a diagram of how to
configure Ethernet cable.
5.3.1 Ethernet Cable Configuration
Note: The standard connector view shown is color-coded for a straight-through cable.
Crossover cable Straight- through cable
RJ-45 PIN RJ-45 PIN RJ-45 PIN RJ-45 PIN
1 Rx+ 3 Tx+ 1 Rx+ 1 Tx+
2 Rx- 6 Tx- 2 Rx- 2 Tx-
3 Tx+ 1 Rx+ 3 Tx+ 3 Rx+
6 Tx- 2 Rx- 6 Tx- 6 Rx-
5.3.2 Ethernet Performance - MVI56E Modules
Ethernet performance on the MVI56E-MNETR module can affect the operation of
the MNETR application ports in the following ways.
ƒ Accessing the web interface (refresh the page, download files, etc…) may
impact MNETR performance
ƒ High Ethernet traffic may impact MNETR performance (consider CIPconnect
(page 68) for these applications and disconnect the module Ethernet port
from the network.