Mobile Wireless Routers Connect To Ethernet Networks Via Profibus

Modems and routers for IP-based networksSiemens is extending its portfolio of industrial routers with the Scalance M804PB, which allows existing machines and plants to be connected to Ethernet networks via Profibus/MPI (Multi-Point Interface). Users can also economically connect older machines and plants directly to the Sinema Remote Connect management platform for remote networks. Secured communication takes place via a VPN tunnel which can be configured and administered via Sinema Remote Connect. The Scalance M804PB is designed for companies in the manufacturing industry such as mechanical equipment manufacturers (OEMs) as well as for companies in the automotive, food & beverage, chemical and pharmaceutical industries.

The device has integrated TIA Portal cloud connector functionality. This allows users to access existing Profibus units from centrally administered engineering tools such as the TIA Portal or Step 7 (from version 5.5). The Scalance M804PB is a Profibus/MPI router for private, wired networks even with existing two-wire cabling. In addition to a Profibus/MPI connection, it also has two RJ45 interfaces in the form of a fast Ethernet two-port switch. It also has a C-Plug/Key-Plug slot.

The Scalance M804PB supports VLAN, Firewall/VPN (IPsec)/NAT, OpenVPN (as client), VRRP/RSTP and can be configured for CLI and SNMP via web-based management tools. Download and upload data rates of 9.6 Kbit/s to 12 Mbit/s can be achieved on the Profibus/MPI interface. The redundant supply voltage is DC 24 V. Mounting options include wall mounting, DIN rails and S7-300 or S7-1500 profile rails.

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PROFIBUS in Practice: System Architecture and DesignPROFIBUS in Practice consists of four parts. Part I covers the installation of PROFIBUS devices and cables. Part II looks at PROFIBUS system engineering, commissioning and maintenance, Part III PROFIBUS system architecture and design and Part IV PROFIBUS operation, protocol and applications. This book is Part III of this series. PROFIBUS are field networks connecting motors, pumps, transmitters and controllers. These devices and systems represented a huge advance and intelligence over the conventional systems of early 1980s when fieldbus technology was introduced in the automation industry.

Field networks bring a cost saving in cabling, take up less space for electrical cabinets, give operators visualized diagnostic information, and simplify electrical and control system designs. It has been an ongoing journey of learning by experience as these networks have been applied in new factory designs, replacing old systems and in updating and extending existing installations. Initially, there were operational losses due to signal reflection and interference getting into such networks. We started to train electricians to observe the rules collected and issued by PROFIBUS & PROFINET International (PI).

Next, we experienced frequent shutdowns due to uncertainties over finding and diagnosing faults and some started to train engineers how to use software and engineering tools to analyse and better understand networked field devices. However, it has taken almost fifteen years in the industry to fully appreciate how many issues are actually caused by poorly thought-through designs. This book answers the need for some guidelines on optimizing design of PROFIBUS DP and PA networks covering installation, trouble-shooting, maintenance, system availability, and life cycle costs. The aim of this book is to bring about improved and standardized engineering practice in the field through sharing a greater understanding of the basics, the components and exploring detailed examples of PROFIBUS systems.

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