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Top 10 things to know about Industrial Ethernet
- Topology. While commercial networks tend to be 'star' shaped with central connection points (and single points of failure), industrial networks use a variety of interconnections, and rely on redundant rings and coupling for added reliability and fast recovery.
- Power Supply. Industrial equipment relies on hard-wired industrial grade 24Vdc supplies - not plug packs held in place with cable ties or tape. Power Supply redundancy is also encouraged.
- Mounting. Desk mount equipment is not suitable for
industrial
mounting, which typically use DIN Rail. Hirschmann SPIDER for example (below) has the same port count as the D-Link, but takes up a lot less cabinet space, and connects securely to the rail.
- Environment. Tolerance to vibration, extremes of temperature and EMI are all part of the requirements for industrial products, with a MTTF measured in decades, not years.
- Network Availability. Industrial applications tend to be more time critical, where even a network downtime of a few seconds can disrupt production cycles causing costly stoppages. Mechanisms for real-time fault identification and recovery, and procedures for rapid replacement of failed components are essential to reduce production losses.
- Range of Hosts. While commercial networks tend to connect Servers, Workstations and Printers, industrial ethernet networks will often, in addition to these, have VSDs, IO, HMI terminals, and increasingly, voice and video. This range of different devices introduces special demands in network management, with higher more constant data loads and prioritisation to meet differing time response requirements.
- Real-Time Capability. Cyclical IO and Drive/Motion applications require real-time delivery of data. By contrast, a delay in delivery of an email or print file generally has a less significant impact.
- Standards. Apart from the common IEEE 802.11 standards, industrial applications have industry specific standards issued by a number of bodies. Common examples relate to transport, shipping and power stations. Industrial ethernet switches should meet standards such as IEC 60068-2-6 for vibration, and EN 61000-4-n for EMI for example to legitimately claim 'industrial' status. Can your current or proposed supplier provide certificates of compliance? Hirschmann can.
- Graphical User Interface - Let's face it, no project engineers spend all their life administering networks, so they don't memorise obscure commands like "#ip vrrp 1 ip 192.168.1.200 secondary". They need a user-friendly interface to quickly show device status and allow configuration, without having to remember another set of commands. Further, easy interfacing to SCADA servers and OPC clients provides integration of systems.
- Fast Replacement - When a unit fails at 3am, you want a fool-proof replacement mechanism that reduces down-time. Removable memory modules with automatic reload on power-cycle allows the shift electrician to do a changeover, without fossicking around for backups.
