June 2, 2009 - R. STAHL expanded the ISbus range, adding a modular Fieldbus Power Supply System which provides up to 28 V and 500 mA 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 1 A, thus 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. Likewise, 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 8 segments with a standard supply or 4 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 the 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.
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