Westermo ODW-642 fibre optic modem certified for use with ABB 800xA DCS


*ODW-642 is a fiber-optic modems designed for redundant ring applications where rapid reconfiguration times are required. In case of a link failure, the ODW-642 will switch over to a multi-drop topology within a few milliseconds, without any noticeable disturbance to the data traffic. The ODW-642 is designed for harsh industrial usage as well as road or railway installations meeting industrial level EMC specifications and having a wide operating temperature range.The maximum distance of a fibre link depends on selected transceiver and fibretype.Fibre distances up to 80 km (50 miles) are possible on each leg of the ring meaning huge rings over 1000 km (621.4 miles) in circumference could be created.The ODW-642 is able to automatically detect the data rate of the connected PROFIBUS-DP device and hence needs minimal configuration prior to use.The unit also has a retiming function that eliminates the problem of jitter and hence ensures reliable communications in all situations.The unit has LED indication to display fault conditions as well as relay contacts that can be connected to a PLC or similar device to allow network problems to be diagnosed at a central point.

Automatic data rate detection and retiming

All PROFIBUSDP data rates up to 12 Mbit/s

9-position D-sub PROFIBUS-DP connection

Redundant power supply inputs

Status interface for fault indication

LED fault indication (Red)

Design for harsh environments

–40°C to +60°C operating temperature

*Product description according to vendor



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