Eaton F810 Redundant fieldbus power for Foxboro I/A series™ control system

• For For Foundation™ fieldbus networks in hazardous areas

• Integrated redundant fieldbus power for FBM228

Foundation™ fieldbus modules

• 8-segment redundancy

• High-density, compact design

• Fully isolated

• Low power dissipation

• No components on carrier

• Built-in "smart" termination

• Continuous physical layer diagnostic option

The F810 fieldbus power system is designed to provide redundant

Foundation™ fieldbus power for Foxboro I/A Series control systems

using FBM228 modules. Eight fieldbus segments are supported. The

system comprises a baseplate which accommodates two redundant

pairs of Foxboro FBM228 modules and two Eaton F801 or F802 power

modules operating in redundant configuration. Failure alarms, galvanic

isolation, power conditioning and segment termination are incorporated

into each F80x module. In applications requiring simplex power, a single

F80x module may be used.

For extreme reliability, the module baseplate has no components and

only provides interconnections between FBM228 modules, the power

modules and external connections.

Each F80x module has indicator LEDs to show both its status and

that of the eight segments under power. In normal operation, each

green 'Segment' LED is lit, showing that the segment is powered. If a

segment is shorted, this LED is extinguished, and the red 'Alarm' LED

is lit. In the alarm condition, a normally closed, galvanically-isolated relay

contact goes to an open condition. Connections to the alarm relay are

made via screw terminals on the F810 baseplate. If multiple F810 units

are used, a common alarm circuit can be achieved by 'daisy-chaining'

the alarm circuits.

The F80x module provides galvanic isolation between the

24V DC input power and the fieldbus segments, as required by

the IEC61158-2 fieldbus standard and the Fieldbus Foundation™

FF-831 validation test for power conditioners. There is also galvanic

isolation between the fieldbus segments, thereby preventing multiple

segment failures from ground faults on more than one segment. Each

segment has its own fieldbus power conditioner and current limitation.

Termination of the fieldbus segment is automatically maintained when

single or redundant F80x modules are fitted.

An F809F-Plus diagnostic module may optionally be installed on the

carrier, to automatically collect and distribute diagnostic information on

each of the eight fieldbus segments. Measured parameters may be

viewed in the Foxboro control system by either assigning the F809F

Plus as a fieldbus device to segment 1 or 8 of the powered segments,

or by means of a separate fieldbus segment. Connections for the

separate segment are provided on the baseplate. For more information

see the F809F-Plus product specification.

Redundant 24V DC (nom.) input power can be connected to the F810

baseplate using Foxboro I/A standard AMP connectors. F80x power

modules and the F809F-Plus fieldbus diagnostic module can either

be powered from the same source or, alternatively, for installations in

which standard Foxboro power supplies are unable to provide sufficient

current capacity, an external 24V DC supply may be connected.

Field wiring connections are available with either pluggable screw

terminals (F810-PS) or pluggable spring clamp terminals (F810-PC).