Basis of Equipment Type
By Philip Burgert
Design and initial configuration are among the most important stages when constructing an industrial network.
Proper configuration can be easier, and a consistent network operation ensured by evaluating a few tips gathered from software and network suppliers.
Tip #1: Configuration should keep real-time traffic in the same local area network and at the same time keep local area networks as small as possible while establishing a firewall demilitarized or demarcation zone between process manufacturing and office or enterprise networks, says Mark Fondl, president and CEO at Network Vision.
Tip #2: With virtual local area networks, be sure to configure network address ranges and subnet masks properly to allow access by routers, Fondl says. Make sure all the subnet masks in a network are in the same range. Organize the VLAN based on application or broadcast domains, not on equipment type. This means segmenting Ethernet traffic to the same structures as traditional industrial networks like SCADA, drives, I/O, and peer-to-peer.
Tip #3: Build networks with the cost of downtime in mind, says Tony Oberkirch, market analyst for N-Tron. “It makes no sense to purchase low-cost or low-quality cable and infrastructure components to save a few dollars, only to find that these components cause regular network outages that cost tens of thousands of dollars with each occurrence,” he adds.
Tip #4: For control applications, use devices equipped with dual, redundant power inputs. Oberkirch notes that most industrial Ethernet devices have mean time between failure (MTBF) figures that exceed those of power supplies. Dual power supplies will ensure maximum uptime and availability of the network.