Banner SureCross DX80 Wireless Networks - Manual (Page 8)

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P/N 136689
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
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