Networking and Communications
Source: Square D Company, Inc.
The Modbus communications protocol is the de facto industry standard for easy, cost-effective networking
The Modbus communications protocol is the de facto industry standard for easy, cost-effective networking. On-line programming or data acquisition applications can be supported directly from the serial port of any computer.
The Modbus Plus multi-purpose control networking solution combines high speed, peer-to-peer communication, and easy installation to simplify applications and reduce installation costs. The global database feature of Modbus Plus makes it easy to broadcast data to all network nodes; and bridges allow separate Modbus Plus networks to connect together, enabling virtually unlimited node count. Standard diagnostic programs and LEDs on all network nodes make troubleshooting your network easy.
Since the Modbus Plus network is based upon the Modbus protocol, bridging communications between the two networks is easy, via PLC option modules or a standalone bridge/multiplexer.
Allowing up to 124 inputs and 124 outputs to be controlled from a single bus, AS-i is a cost-effective alternative to complex machine cabling, offering a 25-35% savings. AS-i can provide a response time of 5 mSecs. even with up to 31 slaves connected. Devices can be added, moved, changed or removed as required, and commissioning is greatly enhanced by the system intelligence. Schneider Electric offers a full range of products to suit the AS-i bus system (including HMI and VSD), as well as PLC-based bus control via integrated ports.
The Modbus-to-Ethernet bridge provides users with a complete Ethernet-based data acquisition and industrial device controls solution. The bridge is packaged as a complete unit with a small footprint that is DIN rail mountable. It translates Modbus to TCP/IP, allowing any Modbus network to communicate over the larger Ethernet network or the internet.
This protocol provides a powerful and standard way to network-enable millions of devices easily and cost-effectively to an enterprise communication network and its associated software applications. The Ethernet bridge is connected to Ethernet with a single 10BaseT port; the Modbus interface is selectable between RS232 and RS485.
As a WorldFIP profile, FIPIO integrates perfectly with the Modicon line of PLCs, simplifying implementation and operation. FIPIO ensures the secure and deterministic real-time exchanges necessary for the operation of remote peripherals and supports UNI-TE and X-WAY addressing, guaranteeing communication transparency within Schneider architectures. Built-in PL7 diagnostic capabilities facilitate fault identification on remote equipment; faulty products can be replaced on the bus while it is in operation, without affecting the remaining peripherals.
This innovative approach to browser-based PLC access centers around a web-embedded server module - for Premium and Quantum PLCs - that provides two key communication functions: an embedded HTTP server and Ethernet TCP/IP connectivity. The web utility software allows additional flexibility, for example, the ability to create HTML screens for specific users' needs.
This solution is ideal for applications requiring real-time access to plant floor data for diagnostics, system health, or maintenance.
Square D Company, Inc., 4101 Capital Blvd., Raleigh, NC 27604. Tel: 919-266-3671; Fax: 919-266-8206.
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