SureCross™ DX80 Network Basics A Guide to SureCross Networks Table of Contents Networking. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Network Topologies. . . . . . . . . . . . . . . . . . . . . . 3 Banner’s SureCross™ Wireless Network. . . . . . 4 Modbus RS-485. . . . . . . . . . . . . . . . . . . . . . . . 6 Modbus/TCP and EtherNet/IP™ Networks. . . . . 8 The OSI Seven Layer Model . . . . . . . . . . . .
Banner Engineering Corp. 9714 Tenth Ave. No. Minneapolis, MN USA 55441 Phone: 763.544.3164 www.bannerengineering.com Email: sensors@bannerengineering.com Banner Engineering Corp. warrants its products to be free from defects in material and workmanship for one year following the date of shipment. Banner Engineering Corp. will repair or replace, free of charge, any product of its manufacture which, at the time it is returned to the factory, is found to have been defective during the warranty period.
Networking Networks exist everywhere around us and are a major contributor to the information age. Some of the most interesting recent developments in factory and process automation have been the networking of machines and controls allowing machine control, data collection, and ultimately informed decisions that can improve productivity, save time, and reduce scrap.
DX80 Network Basics Reference Guide Banner’s SureCross™ Wireless Network To balance reliable communication with efficient power management, the SureCross™ wireless network uses a star network topology. Each node within a network communicates only with the gateway, or master device. To ensure each node can reliably send and receive data to the master device, a TDMA architecture is employed.
DX80 Reference Guide Network Basics Device ID To route communication between devices, device identification numbers are assigned to each device in a network. In the SureCross system, device 0 is always the master device, the Gateway. All other nodes are assigned device identification numbers from 1 through 15. Even when all 15 nodes are not installed, the TDMA frame remains established for 15 nodes and the send and receive frames for those nodes are unused.
DX80 Network Basics Reference Guide Modbus RS-485 Modbus Remote Terminal Unit (RTU) running over RS-485 cabling is sometimes abbreviated as Modbus 485 and is a master-slave communications protocol typically used for industrial applications. RS-485 refers to the physical layer of the network. Modbus 485 is used for the hard-wired interface on Banner’s SureCross™ wireless products. The particular variation of RS-485 chosen for Banner’s SureCross wired network is 2-wire RS-485 running at 19.
DX80 Network Basics Reference Guide The DX85 Expanded Remote I/O device and many other Modbus slave devices cannot be used on a network without a Modbus master, so the DX80 Gateway includes Modbus master functionality. Because a Modbus network can only have one master, the network cannot include the PLC if the Gateway must have direct control over DX85 devices (see Network 2).
DX80 Network Basics Reference Guide 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.
DX80 Network Basics Reference Guide For Industrial Ethernet, the Ethernet Bridge functions as a slave device. In the Network 3 image shown, the computer functions as the master industrial Ethernet device. Like the Gateway, the Ethernet Bridge can act as both a master and slave device for the various networks.
DX80 Network Basics Reference Guide The OSI Seven Layer Model The Open Systems Interconnection (OSI) seven layer model attempts to describe network communication protocols as a layered series of steps necessary to transmit information between dissimilar devices or networks. Host Layers The lowest level of the model is the physical level and pertains to the actual transfer media (air, wires), connector types, voltages, and signaling speeds for a specific type of network.
DX80 Network Basics Reference Guide Host Layers Application Unique Application Presentation Though the SureCross wireless product is a proprietary wireless network and the various protocol layers are proprietary, the wireless network can be compared to the standard seven layer model. Instead of wires creating a connection, the 900 MHz or 2.4 GHz radio signal transmits the binary data, creating a radio signal “link.
Glossary DX83 Ethernet Bridge Acts as a communications bridge between the Modbus RTU network (Gateway) and Modbus/TCP or EtherNet/IP host systems and includes the ability to configure the network using a Web browser interface. DX80 Gateway SureCross™ DX80 wireless network master communication device used to control and initiate commands to other devices in the system; serves as a “portal” from one network to another and communicates between the wireless network and the central control process.
