Manual

8 P/N 136689
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: [phone]
DX80
Reference Guide
Network Basics
Modbus/TCP and EtherNet/IP™ Networks
Attaching host devices to the Modbus network using standard Ethernet hardware requires using one of several Ethernet-based
communications protocols.
Modbus/TCP is an open standard protocol developed by the Modbus IDA (www.modbus.org). It is very similar to Modbus RTU except
that it uses standard Internet communication protocols, just like Web communications or e-mail. The master is referred to as the client
and the slave is the server. Modbus/TCP follows the same structure as Modbus RTU: clients initiate all communications, servers can
only respond, etc. However, given the power of TCP/IP, many client/server connections can be open at the same time, with one device
functioning both as a client and as a slave.
EtherNet/IP™ is an open standard protocol developed by Allen-Bradley, but managed by the ODVA, (www.odva.org). EtherNet/IP is an
adaptation of the DeviceNet serial fieldbus protocol using Internet communication protocols. EtherNet/IP stands for Ethernet Industrial
Protocol, not Ethernet Internet Protocol. EtherNet/IP is DeviceNet over Ethernet.
Serial and Ethernet Versions of Automation Protocols
Serial Ethernet
Modbus RTU Modbus/TCP
DeviceNet EtherNet/IP
DX83 Ethernet Bridge
Connecting a Modbus RTU network to an Ethernet-based network requires using another type of networking gateway, the SureCross™
DX83 Ethernet Bridge. The Ethernet Bridge device acts as a communications bridge between the Modbus RTU network (Gateway) and
Modbus/TCP or EtherNet/IP (host systems).
In the Modbus RTU network, the DX83 Ethernet Bridge is the Modbus 485 master and the Gateway is set to the default Modbus slave
setting. The DX85 Expanded Remote I/O device is a slave of the Ethernet Bridge and is not under the control of the Gateway. For other
configurations, refer to Banner document p/n 133601, DX80 System Layouts.
Host System
Wireless Network
Device 1
Device 2
Wireless Master
Device (Device 0)
Modbus Network
Slave ID 2
Slave ID 3
Slave
ID 1
RS 485
Cable
DX83 Ethernet
Bridge Modbus
Master
Ethernet Network
Network 3: Ethernet Bridge as Modbus Master