Product Announcement from R. STAHL, Inc.
R. Stahl adds a new, innovative power supply for FOUNDATION fieldbus H1 applications to its ISbus Fieldbus Power Supply System. Advanced Fieldbus Power Supply features a wide range of additional diagnostic functions for monitoring fieldbus segments. The power supply generates a warning message if the transmission quality in the bus deteriorates so that users can intervene before a segment fails. Priced roughly 10% more than the simple Fieldbus Power Supply, the high-performance version enables complete, continuous plant monitoring without a significant increase in investment costs.
Advanced Fieldbus Power Supply continuously reads the physical parameters (physical layer) of the fieldbus, such as voltage and current on the trunk, communication level, noise level, asymmetries, and jitter. If any parameter deteriorates by a predetermined value that can be easily adjusted on the device, the system signals a warning through a yellow LED and simultaneously transmits the warning message to the control system via a potential-free relay contact. Situations that exceed or fall below the fieldbus specification are indicated by a red LED and the relay contact.
The power supply can be connected to a PC through a serial interface to read out data if detailed information about physical layer parameters is required. Like the basic version, Advanced Fieldbus Power Supply System supplies the fieldbus with 28 V and 500 mA and enables a 1-A supply via a parallel connection of two devices in the "boost" mode. An optional redundant supply is available to ensure redundant diagnosis. The units can be installed on a DIN rail or bus-carriers, and operated in mixed installations with basic models.
The advanced model incorporates a completely new, integrated physical layer diagnosis concept to allow for integrated, cost-efficient monitoring of fieldbus installations, rendering complex and costly separate diagnosis modules unnecessary.