Friday, June 12, 2009

Stahl Releases Fieldbus Power Supply System

Stahl has expanded the ISbus range, adding a modular Fieldbus power supply system that provides up to 28V and 500mA for Foundation Fieldbus H1 segments, and allows for redundant supply. In Boost mode, a parallel connection of two power supplies enables users to continuously supply the bus with up to 1A, providing sufficient power reserves even for special Fieldbus applications.

An integrated basic diagnosis function monitors each segment for line faults, reporting these via a potential-free relay contact and indicating them via a red Error LED. The activation of the integrated switchable Fieldbus terminator is clearly indicated by a yellow LED. The units can be installed on a DIN rail or clicked into place on special bus carriers. On each bus carrier, up to eight segments with a standard supply or four segments with a redundant supply are connected to a host via optional precon-figured system cables.

The bus carrier can be operated with a redundant auxiliary power supply. It ensures shielded connection of the Fieldbus cables via large-scale terminals. The terminals also serve as a cable-strain relief. The basic Fieldbus power supply version monitors the bus for cable breaks and short circuits. The advanced Fieldbus power supply, available shortly, provides advanced diagnostic features concerning physical layer parameters, such as signal level, noise, asymmetries and jitter, rendering costly diagnosis modules unnecessary.

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