Fieldbus & Industrial Networking


Redundant power for H1 Fieldbus links

August 2005 Fieldbus & Industrial Networking

MTL has produced its F660A redundant Fieldbus power IOTA, which is designed to provide redundant power for four H1 Fieldbus links when used with Honeywell Experion PKS 'Series C' Fieldbus interface modules and C300 controllers.

The module carrier complies with the mechanical and electrical requirements of size B I/O Termination panels (IOTAs), for direct fitting into the Honeywell mounting channel. The F660A includes two FPS-IPM plug-in power modules for each of the four Fieldbus links. These modules function as power conditioners, providing impedance between the input DC power supply and the Fieldbus. A switchable Fieldbus segment terminator is provided for each Fieldbus link.

The MTL-Relcom redundant Fieldbus power supplies (FPS-Series) form the basis of the F660A and provide redundant power conditioning for the Fieldbus network segments. The individual power conditioning modules can be replaced without interrupting power or communication on the Fieldbus segment.

Each power module provides galvanic isolation of 250 V a.c. between the Fieldbus segment and the input power supplies. This output is maintained, even if one power module is installed per segment. Construction of very long Fieldbus segments with a large number of bus-powered transmitters is allowed because of this level of output power.

Power for the IOTA is picked up via mounting screws from 24 V d.c. busbars that are embedded in the mounting channel. A separate alarm module monitors the state of each of the eight power conditioning modules and the 24 V d.c. power input. In the event of a failed conditioning module, the FIM receives a signal indicating which segment is affected, and a red LED on the alarm module illuminates.

This redundant power supply also comes with a multipin connector for direct connection to the FIM IOTA, by means of a standard system cable.

For more information contact K.V. Dahya, Extech/Temperature Controls, 011 791 6000, [email protected]



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