FOXBORO Fieldbus Communications Module, FCM10Ef

I/ASeries® Hardware

Fieldbus Communications Module, FCM10Ef

The FCM10Ef Fieldbus Communications Module is a

fiber optic communications interface which allows the

DIN rail mounted Fieldbus Modules (FBMs) to

communicate with the I/A Series control station over

extended distances using fiber optic cabling. The

FCM10Ef modules provide expanded networking,

easy customization, and greater overall cabling

distances in a fiber optic network (see Figure1). This

configuration is ideally suited for sites in which groups

of FBMs are to be spread apart over greater

distances.

FCM10Ef modules are used with multiport fiber optic

converters (hubs), which connect to the I/ASeries

control station via the high-speed, optionally

redundant 10 Mbps Ethernet trunk Fieldbus.

Up to six groupings of baseplate-mounted FCM10Ef

modules and FBMs can be linked to each optionally

redundant multiport fiber optic converter (hub), for a

maximum of 120 FBMs per I/A Series control station

(depending on selected scan periods). To support

redundancy, a pair of FCM10Ef modules must be

used for each FBM grouping. In non-redundant

configurations, only a single FCM10Ef is required for

each grouping.

Signal transmission distances up to 2 km (1.24 mi)

are possible between the FCM10Ef modules and the

multi-port fiber optic converters (hubs), providing for

wide distribution of the FBM equipment groupings.

Extended transmission distances, using fiber optic

cabling, are also possible within the groupings, and

between the multiport fiber optic converter (hub) and

the I/A Series control station. (Refer to

PSS21H-2W1B3. for details.)

FIBER OPTIC CABLING

Unaffected by electrical noise (EMI, RFI, and

lightning), fiber optic cabling provides a versatile,

highly reliable means of extending signal

communications. It can be used in areas containing

rotating machinery, arc welders, and so forth, and can

be installed in cable trays containing high voltage

power lines, or in outdoor areas exposed to lightning

hazards. Its electrical isolation characteristics provide

protection from voltage differentials and ground loops.

Fiber optic cabling used in this configuration is

purchased by the customer. The recommended fiber

optic cable is a multimode, graded-index glass fiber

with a 62.5 micron core and 125 micron cladding with

0.275 NA (numerical aperture).

Maximum allowable signal loss is 1 dB per km at a

wavelength of 1300 nm, and 3.6 dB per km at a

wavelength of 850 nm. Cables with different

characteristics may not be used. Four fiber optic

cables are required for redundancy, two for transmit

and two for receive connections. For this reason, it is

recommended that the customer purchase duplex

cabling, which consists of two fibers intertwined in a

single cable. The cables must be terminated with

ST-type connectors and cable length may not exceed

that specified for the module.

Other cable requirements (such as flexibility, or

durability) depend on the particular application. Check

with your cable vendor/installer for a listing of

application-specific cable characteristics.

FCM10Ef MODULE DESIGN

FCM10Ef modules convert 2 Mbps signals used by

the FBMs, to 10 Mbps fiber optic Ethernet signals

used with fiber optic cabling, and vice versa.

FCM10Ef modules have a compact design, with a

rugged extruded aluminum exterior for physical

protection of the circuits. Enclosures specially

designed for mounting of the FBMs and FCMs

provide various levels of environmental protection for

the FCM10Ef modules, up to harsh environments per

ISA Standard S71.04.

The FCM10Ef can be removed/replaced from the

baseplate without removing power.

Six light-emitting diodes (LEDs) incorporated into the

front of the FCM10Ef indicate the status of network

activity to/from the associated FBMs, and the

FCM10Ef module’s operational status.

FUNCTIONAL SPECIFICATIONS

Regulatory Compliance (Cont.)

INPUT VOLTAGE RANGE (REDUNDANT)

24 V dc +5%, -10%

CONSUMPTION

7 W (maximum) at 24 V dc

HEAT DISSIPATION

7 W (maximum) at 24 V dc

Vibration

0.75 g (5 to 200 Hz)

Calibration Requirements

Calibration of the module is not required.

Regulatory Compliance

ELECTROMAGNETIC COMPATIBILITY (EMC)

European EMC Directive 89/336/EEC

EN 50081-2 Emission standard

EN 50082-2 Immunity standard

IEC 61000-4-2 ESD Immunity

Contact 4 kV, air 8 kV

IEC 61000-4-3 Radiated Field Immunity

10 V/m at 80 to 1000 MHz

IEC 61000-4-4 Electrical Fast Transient/Burst

Immunity

2 kV

IEC 61000-4-5 Surge Immunity

2kV on ac and dc power lines; 1kV on I/O and

communications lines

IEC 61000-4-6 Immunity to Conducted

Disturbances

10 V

IEC 61000-4-8 Power Frequency Magnetic Field

Immunity

30 A/m

IEC 61000-4-11 Voltage Dips, Short Interruptions

and Voltage Variations Immunity

PRODUCT SAFETY

European Low Voltage Directive 73/23/EEC

PRODUCT CERTIFICATION

Underwriters Laboratories (UL)

UL/UL-C listed as suitable for use in UL/UL-C

listed Class I, Groups A-D; Division 2;

temperature code T4 enclosure based systems.

The modules are also UL and UL-C listed as

associated apparatus for supplying non

incendive communication circuits for Class I,

Groups A-D hazardous locations when

connected to specified I/A Series processor

modules as described in the I/A Series DIN Rail

Mounted FBM Subsystem User’s Guide

(B0400FA). Communications circuits also meet