Belden Data Communication Cables (MODBUS )

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Applications

• Developed byModicon, Modbus is a master/slave serial line communication protocol is used to interconnect intelligent automation devices. This protocol operates at layer 2 of the OSI model.
• In a master-slave type system, the “master” node issues explicit commands to one of the “slave” nodes and processes responses. Typically, slave nodes will not transmit data without a request from the master node, and they will not communicate with other slaves.
• At the physical level, Modbus systems may use different physical interfaces (EIA-485, RS-232). The TIA/EIA-485 (EIA-485) Two-Wire interface is, however, the most common. As an option, the EIA-485 Four-Wire interface may be implemented. And when the system only requires short point-to-point communication, the TIA/EIA-232-E (RS-232) serial interface may be used as an interface.
• Modbus application layer messaging protocol, positioned at layer 7 of the OSI model, provides client/server communication between devices connected on buses or networks. The client role is provided by the Master of the serial bus and the slave nodes act as servers.
• For applications that require high up-time, Modbus Plus cable redundancy is offered on the dual cable PCI interface. A redundant cable capability allows Modbus Plus to communicate over two independent cables, testing the integrity of both cables with every message. Should a problem occur with one of the cables, the system automatically switches over to the other cable. The faulty cable is then flagged as a statistic and it is visually flagged on the interface card. This redundancy allows a network or a plant to continue operation even with a cable out of service.
• Using a RS-232 physical interface, the maximum distance would be 50 ft. at 10kbps. Using a EIA-485 physical interface, the maximum distance would be 4,000 ft. at 100kbps. A maximum of 247 nodes are possible.

Modbus Cables
Modbus RS-232 Shielded Twisted Pair Cables

• 8777 3 Pairs, 22 AWG Stranded (7×32) Tinned Copper Conductors, Datalene® Insulation, Individually Beldfoil Shielded (100% Coverage), 24 AWG Stranded Tinned Copper Drain Wire, Chrome PVC Jacket, 300V 90^oC
• 88777 3 Pairs, Plenum-rated, 22 AWG Stranded (7×30) Tinned Copper Conductors, FEP Insulation, Individually Beldfoil Shielded (100% Coverage), 22 AWG Stranded Tinned Copper Drain Wire, FEP Jacket, 300V 200^oC

Modbus II RG-6 Type Coaxial Cables

• 3092A RG-6, Quad Shield, PVC
• 3093A RG-6, Quad Shield, Plenum-rated
• 3092F RG-6, Quad Shield, PVC, Flexible Version
• 123092A RG-6, Quad Shield, Aluminum Armor

RG-6, Quad Shield, Steel Armor
Custom cables are available upon request which can utilize any number of construction features such as -

• Armoring - Aluminum Interlock, Steel Interlock, and Continuous Corrugated Aluminum
• Armor Tapes - Corrugated Copper, Aluminum, and Steel
• Jackets - PVC, CPE, LDPE, TPE, HDPE, Fluorocopolymer, Oil Res II, Low Smoke Zero Halogen (LSZH), Haloarrest®, and Polyurethane
• Shielding - Overall Beldfoil®, Duofoil®, TC Braid, TC Double Braid, Individual Beldfoil Copper Tape Shields, and “French Braid”
• Insulations - Datalene®, XLPE, FEP, Polypropylene, Foam FEP, HDPE, PVC, TPE, and PVC-Nylon
• Conductors - Solid BC, Stranded BC, Solid Bare Copper-covered Steel, and Stranded TC

Hirschmann Active Devices

• Representing experience and expertise in automation technology, Hirschmann products have been designed to ensure hassle-free data communication under even the toughest conditions.
• For Modbus, Hirschmann provides the OZD 485 G12 series of industrial-grade fiber optic repeaters. This series offers both ring redundancy and predictive maintenance.
• Lumberg Automation Connectivity

Lumberg, a leading name in industrial connectivity, offers the following connectivity products for Modbus application -

• Centralized I/O distribution systems
  
  • e2c 20, IP20 rated

• Fieldbus I/O modules
  
  • LioN-S

• Field-attachable connectors

• Overmolded cordsets
  
  • Micro M12-M12/IP67
  • RJ45 to RJ45/IP20
  • RJ45 to Micro M12/IP20

• Ethernet switches