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Each power module provides galvanic isolation of 250V ac between

the fieldbus segment and the input power supplies. Each FPS-I supplies

350mA at 25V dc to the fieldbus segment. This output is maintained

even if only one power module is installed. This level of output power

allows for construction of very long fieldbus segments with a large

number of bus-powered transmitters. Each FPS provides both power

conditioning and input power supply redundancy to each fieldbus

segment.

LED indicators on each power module and near each of the two input

power supply connections give clear visual indication that components

are functioning properly. To minimize system downtime, an alarm circuit

provides notification if any of the power supply components fail. This

allows failed components to be replaced so that power system integrity

is maintained.

The alarm circuitry is galvanically isolated from the fieldbus segments

and input power supplies. The two power modules plug into a DIN rail

mounted backplane (Redundant Coupler or RCT) that contains one

segment terminator and provides connections to the two input power

supplies, H1 host system, fieldbus trunk cable, and alarm circuitry.

A bus configuration is used for the input power and alarm connections

so that up to eight fieldbus power systems can be easily wired together

to share input power supplies and provide a common alarm circuit.

Pictured above is a Redundant Fieldbus Power Supply with connections

to the Fieldbus H1 host shown at the top of the picture.

Segments that do not require the high availability provided by

redundant power conditioning may be operated with only a single

FPS-IPM. To prevent an unwanted alarm condition due to the second

FPS-IPM not being fitted, a blanking module should be installed in the

blank slot. These are supplied in a pack of 10 as part number FPS-BLK10.

• Redundant power conditioner for high availability applications

• Replace power modules without resetting the fieldbus

• High power output

• Two levels of power redundancy

• Component failure alarm

• Integrated fieldbus terminator

• Simplified power wiring

The MTL-Relcom redundant fieldbus power system (FPS-I range)

provides redundant power conditioning for fieldbus  network segments

and facilitates the connection of redundant bulk DC supplies. The system

is fully ‘hot-swappable’ meaning that individual power conditioning

modules and input power supplies can be replaced without interrupting

power or communication on the fieldbus segment. An alarm circuit

provides warning in case of a power conditioning module or input power

supply failure. The system is designed so that power for several fieldbus

segments can be provided from a single cabinet with minimal wiring.

One fieldbus segment terminator is built into each power system.

Each FPS includes two plug-in power modules. These modules function

as power conditioners, providing impedance between the input DC

power supply and the fieldbus. This impedance is necessary to prevent

the input DC power supply from degrading the digital fieldbus signal.

The 9372-FB Redundant Fieldbus Barrier is based on MTL’s revolutionary

9370-FB Series products, which are supplied as complete, factory-assembled

enclosure systems that do not require additional wiring, customised housings or

complex ancillary components. Electrical and mechanical aspects of the design are

integrated, providing the industry’s first complete, ergonomic solution for ‘High

Energy Trunk’ applications in hazardous areas.

Uniquely, the key modular components of the system (Fieldbus Barrier, Terminator

and Surge Protectors) may be ‘hot-plugged’ by design and without gas-clearance

procedures or separate isolating switches. This virtually eliminates the risk associated

with hazardous area maintenance activities, speeds module replacement and avoids the

need for specialist operator training.

Optional features include pluggable surge protection components for the fieldbus

trunk and individual spurs. Connection facilities with generous room for cable

management are provided within the Fieldbus Barrier enclosure for the trunk and

spur wiring.

For added flexibility, a redundant-capable enclosure can be specified part-populated

with one 6-spur module (model no. 9375-FB). This permits future upgrading from

simplex to redundant mode simply by plugging in an additional Fieldbus Barrier

module and optional alarm module.

The 9372-FB Fieldbus Barrier is bus powered and requires no additional power

supply in the field. When used with a fieldbus host control system, power for the trunk

may be provided by redundant MTL-Relcom power supplies.

Each enclosure system uses duplicated Fieldbus Barrier modules in a redundant

configuration to achieve significantly higher system availability than equivalent

‘simplex’ units. The 9372-FB may therefore be selected for critical process applications

where failure of the Fieldbus Barrier would otherwise result in unacceptable downtime

or lost production. It is also ideal for use in Fieldbus Safety Instrumented Function (SIF)

networks in which nuisance trips cannot be tolerated. Failure annunciation to the host

control system is provided by means of an integrated Foundation™ fieldbus device with

Digital Input Function Block capability.

In common with conventional Fieldbus Barriers, each intrinsically safe spur is

capable of supporting a FISCO or ‘Entity’ certified fieldbus device located in a Zone 0 or 1

hazardous area. The short-circuit protected spurs are galvanically isolated from the trunk

and require no protective ground connection in the field.

• For Foundation™ fieldbus networks in hazardous areas

• Redundant configuration for super high system availability

• Complete enclosure systems for up to 6 intrinsically safe spur connections

• Failure alarm direct to host control system via integrated fieldbus device

• Mount in Zone 1 (gas) or 21 (dust) with spurs connected into Zone 0

• Compatible with FISCO and Entity certified fieldbus instruments

• Ergonomic mechanical design

•  Pluggable system components, without ‘gas free’ constraints

• Optional, integrated surge protection for trunk and spurs

The 9372-FB Redundant Fieldbus Barriers are field-mounted wiring hubs that create

up to six intrinsically safe spur connections from a high-energy trunk, for connection to

suitably certified Foundation™ fieldbus H1 instruments. They may be installed in Zone 1

(gas) or Zone 21 (dust) hazardous areas, with the trunk wiring implemented using suitably

protected cable and increased safety (Ex e) connection facilities.

Uniquely, the key modular components of the system (Fieldbus

Barrier, Terminator and Surge Protectors) may be ‘hot-plugged’ by

design and without gas-clearance procedures or separate isolating

switches. This virtually eliminates the risk associated with hazardous

area maintenance activities, speeds module replacement and avoids

the need for specialist operator training. Further optional features

include pluggable surge protection components for the fieldbus trunk

and individual spurs.

The 9387-FB-R Fieldbus barrier assembly is bus powered and

requires no additional power supply in the field. When used with a

fieldbus host control system, power for the trunk may be provided by

redundant MTL power supplies.

The assembly uses duplicated fieldbus barrier modules in

a redundant configuration to achieve significantly higher system

availability than equivalent ‘simplex’ units. The 9387-FB-R may

therefore be selected for critical process applications where failure

of the Fieldbus Barrier would otherwise result in unacceptable

downtime or lost production. It is also ideal for use in Fieldbus Safety

Instrumented Function (SIF) networks in which nuisance trips cannot

be tolerated. Failure annunciation to the host control system is

provided by means of an integrated Foundation™ fieldbus device with

Digital Input Function Block capability.

In common with conventional fieldbus barriers, each intrinsically

safe spur is capable of supporting a FISCO or ‘Entity’ certified fieldbus

device located in a Zone 0 or 1 hazardous area. The short-circuit

protected spurs are galvanically isolated from the trunk and require no

protective ground connection in the field.

The 9387-FB-R redundant fieldbus barrier assembly is based on

the 9370-FB range of products, which are supplied as complete,

factory-assembled systems that do not require additional wiring or

complex ancillary components. The electrical and mechanical aspects

of this design have been integrated to provide the industry’s first

complete, ergonomic solution for ‘High Energy Trunk’ applications in

hazardous areas.

• For Foundation™ fieldbus networks in hazardous areas

• Pre-assembled system components for up to 5 intrinsically

safe spur connections

• For assembly into user-specified field enclosure

• Spurs compatible with FISCO and “Entity-certified”

fieldbus instruments

• Ergonomic mechanical design

• Pluggable system components without “gas free” constraints

• Optional, integrated surge protection for trunk and spurs

The 9387-FB-R (5-spur) Open-frame redundant fieldbus barrier

provides intrinsically safe spur connections from a high-energy trunk, for

connection to suitably certified Foundation™ fieldbus H1 instruments.

The unit comprises pre-wired and assembled system components on

a stainless steel baseplate, for installation into a suitably certified field

enclosure. Connection facilities are provided for the trunk and spur

wiring, as well as all electronic modules needed to support a fully

working Fieldbus Barrier. In a typical application, an Ex e (increased

safety) certified field enclosure will be selected to allow installation

in a Zone 1 hazardous area; third-party approval of the enclosure and

contents is normally required.

• For Foundation™ fieldbus networks in

hazardous areas

• Pre-assembled system components

for 6 or 12 intrinsically safe spur

connections

• For assembly into user-specified field

enclosures

• Spurs compatible with FISCO and

“Entity-certified” fieldbus instruments

• Ergonomic mechanical design

• Pluggable system components

without “gas free” constraints

• Optional, integrated surge protection

for trunk and spurs

The 9387-FB (6-spur) and 9388-FB (12

spur) Fieldbus Barrier assemblies provide

intrinsically safe spur connections from a

high-energy trunk, for connection to

suitably certified Foundation™ fieldbus H1

instruments. Each unit comprises pre-wired

and assembled system components on a

stainless steel baseplate, for installation into

a suitably certified field enclosure. Connection

facilities are provided for the trunk and spur

wiring, as well as all electronic modules

needed to support a fully-working Fieldbus

Barrier. In a typical application, an Ex e

(increased safety) certified field enclosure will

be selected to allow installation in a Zone 1

hazardous area; third-party approval of the

enclosure and contents is normally required.

Alternative uses include applications that are

not satisfied by the 9370-FB Series Fieldbus

Barriers in standard enclosures, such as the

installation of multiple fieldbus segments

inside a single field enclosure.

Each intrinsically safe spur is capable

of supporting a FISCO or ‘Entity’ certified

fieldbus device located in a Zone 0 or 1

hazardous area. The short-circuit protected

spurs are galvanically isolated from the trunk

and require no protective ground connection

in the field. The units are bus powered and

require no additional power supply in the

field. When used with a fieldbus host control

system, power for the trunk may be provided

by MTL power supplies in redundant or non

redundant format.

The 9387-FB and 9388-FB share the unique

features of MTL’s class-leading 9370-FB

Series Fieldbus Barrier system. The key

modular components of the system (Fieldbus

Barrier, Terminator and Surge Protectors) may

be ‘hot-plugged’ by design and without gas

clearance procedures or separate isolating

switches. This virtually eliminates the risk

associated with hazardous area maintenance

activities, speeds module replacement

and avoids the need for specialist operator

training. Optional features include pluggable

surge protection components for the fieldbus

trunk and individual spurs.

The fieldbus barrier is mounted in a 316L stainless steel,

increased safety, Ex e enclosure that segregates spur and

trunk cabling in accordance with hazardous area certification.

Inside the enclosure, the incoming trunk wiring terminates

in a separate compartment containing increased safety (Ex

e) trunk wiring terminals. This compartment has a protective

cover to deter interference, and carries a warning to the user

not to work on trunk wiring without first isolating the power.

A fieldbus terminator is included for the trunk wiring to ensure

correct termination of the wiring and prevent unwanted

reflections and signal disturbances.

The system described in this manual provides 12 spurs of

“simplex” type – meaning they are not intended to provide

redundancy between spurs. Each spur is short circuit

protected, so that other devices continue to operate in the

presence of field wiring faults.