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Reference
MVI56E-MNETR ♦ ControlLogix Platform
User Manual
Modbus TCP/IP Interface Module with Reduced Data Block
Page 130 of 175
ProSoft Technology, Inc.
June 14, 2011
5.3
Ethernet Cable Specifications
The recommended cable is Category 5 or better. A Category 5 cable has four
twisted pairs of wires, 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 130) 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
1 Rx+
3 Tx+
2 Rx-
6 Tx-
3 Tx+
1 Rx+
6 Tx-
2 Rx-
RJ-45 PIN
RJ-45 PIN
1 Rx+
1 Tx+
2 Rx-
2 Tx-
3 Tx+
3 Rx+
6 Tx-
6 Rx-
5.3.2 Ethernet Performance
Ethernet performance on the MVI56E-MNETR module can affect the operation of
the MNETR application ports in the following ways.
Accessing the web interface (refreshing the page, downloading files, and so
on) may affect MNETR performance
High Ethernet traffic may impact MNETR performance (consider CIPconnect
(page 71, page 24) for these applications and disconnect the module
Ethernet port from the network).