Power Supplies Enable Continuous Plant Monitoring

Stahl's Advanced Fieldbus Power Supply (A-FPS) modules for Foundation fieldbus H1 segments provide a range of physical layer diagnosis functions, enabling complete and continuous plant monitoring. Each module offers a 10 per cent premium over the standard supply module from the same series, detecting overload and short circuits on its segments and continuously registering the physical parameters of the fieldbus, such as voltage and current on the trunk, communication level, noise level, asymmetries and jitter.

Error messages can be routed to a management software via the Diagnosis Communication Module (DCM) and the FF H1. Additionally, they are signalled via a potential-free relay contact. A serial interface on the front side makes it possible to read out detailed data on site by means of standard terminal programs. Colour LEDs in a traffic-light design following the NAMUR NE107 scheme ensure that untrained staff members can identify problems at the module at first glance.

In case of deteriorating transfer quality on the bus, warning messages can be triggered proactively, allowing users to make adjustments before a segment fails. The line-quality threshold value can be manually adjusted by means of a control dial at the module. The compact units can be installed on a DIN rail or on a bus carrier, which houses modules for up to eight standard-supply segments or four segments with a redundant supply. The carrier systems are also available as adapted models for specific host systems and their plug connectors, such as Emerson Delta V and Yokogawa Centum VP.

Each power-supply module features an integrated terminating resistor, which can be turned off in host systems with their own bus terminator. Like the basic version, the Advanced Fieldbus Power Supply System supplies the fieldbus with 28V and 500mA, and enables a 1A supply via a parallel connection of two devices in boost mode. If users decide on a redundant supply setup in which two modules provide 250mA each, they will automatically also benefit from redundant diagnosis functions.

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