FOXBORO FBM216 HART® Communication Redundant Input Interface Module

FBM216 HART® Communication Redundant Input Interface Module

The FBM216 offers redundant modules for eight input channels, each accepting a 4 to 20mA analog signal

or a digital HART® signal superimposed on a 4 to 20 mA analog signal.

FEATURES

Key features of the FBM216 module are:

Eight analog input channels, each accepting one

of the following inputs:

• Standard 4 to 20 mA analog sensor signal

• Digital HART Frequency Shift Keying (FSK)

signal superimposed on a 4 to 20 mA analog

signal.

Module pair offers redundancy at the FBM level

FSK modem dedicated to each input channel for

bi-directional digital communications with a

HART field device

Analog to digital conversion of each of the 4 to

20 mA input signal from the HART devices

Support for the HART universal commands

necessary to interface the field device with the

I/A Series® system database

Galvanic isolation of the group of 8 input

channels from ground and module logic

Compact, rugged design suitable for enclosure in

Class G3 (harsh) environments

High accuracy achieved by sigma-delta data

conversions for each channel

Termination Assemblies (TAs) for locally or

remotely connecting field wiring to the FBM216

Termination Assemblies for per channel internally

and/or externally loop powered transmitters.

OVERVIEW

The FBM216 HART Communication Redundant

Input Interface Module contains eight group-isolated

input channels. The FBM216 supports any mix of

standard 4 to 20 mA devices and HART devices.

A pair of modules combines to provide redundancy

at the Fieldbus Module (FBM) level, with field inputs

wired to one common termination assembly (see

Figure 1). In this configuration, one FBM216 is the

Master, and the other is the Tracker.

The FBM216 serves as a HART communications field

device host, enabling the I/A Series system to

request and receive two digital messages per second

from each field device. The message pass-through

capability can be used to support HART universal,

common practice, and device-specific commands,

but not the burst communication mode. These

commands are implemented using the Intelligent

Field Device Configurator (IFDC — refer to PSS

21S-8A2 B3 for details).

The FBM216 provides a common isolated power

supply to power all eight channels. Optionally, the

channels can be powered by an external power

supply, in which case a Cable Balun module is

required to prevent channel crosstalk.

HIGH ACCURACY

For high accuracy, the module incorporates a Sigma

Delta converter which can provide new analog input

values for each channel every 100 milliseconds.

COMPACT DESIGN

The FBM216 has a compact design, with a rugged

extruded aluminum exterior for physical protection of

the circuits. Enclosures specially designed for

mounting the FBMs provide various levels of

environmental protection, up to harsh environments

per ISA Standard S71.04

HIGH RELIABILITY

The redundancy of the module pair, coupled with the

high coverage of faults, provides very high

subsystem availability time.

Either module may be replaced without upsetting

field input signals to the other module. A module can

be removed or replaced without removing field

device termination cabling, power, or

communications cabling.

REDUNDANT ANALOG INPUTS

For each input operation, identical reads are sent to

both modules, fully exercising the Fieldbus and the

logic circuitry of each module. Each input channel

accepts an analog sensor input or a self-powered

4 to 20 mA source. Device power from each module

is diode OR’d together in the redundant adapter to

ensure redundant power.

The microprocessor of each module executes the

analog I/O application program, plus security routines

that validate the health of the FBM. Input channel

security is enhanced by redundantly powering the

input current loop from per-channel power supplies in

each module of the pair.

VISUAL INDICATORS

Light-emitting diodes (LEDs) incorporated into the

front of the module provide visual indication of the

module’s operational and redundancy status, and

communication activity on the channels. Two

additional LEDs provide the master or tracker status

of the modules.

FIELDBUS COMMUNICATION

A Fieldbus Communication Module or a Control

Processor interfaces the redundant 2 Mbps module

Fieldbus used by the FBMs. The FBM216 module

accepts communication from either path (A or B) of

the redundant 2 Mbps fieldbus – should one path fail

or be switched at the system level, the module

continues communication over the active path.

The use of an external power supply common to two

or more loops requires a Cable Balun module to

maintain communication signal line balance.

MODULAR BASEPLATE MOUNTING

The module mounts on a modular baseplate which

accommodates up to four or eight FBMs. The

modular baseplate is either DIN rail mounted or rack

mounted, and includes signal connectors for

redundant fieldbus, redundant independent dc

power, and termination cables.

Redundant modules must be lo

CABLE BALUN MODULE

The Cable Balun module is used to maintain digital

communication line balance for HART Transmitter to

FBM loops that are powered from a common

external power supply. This powering effectively

connects one line of each loop together. Without the

Baluns, in each loop so powered, the common

connection at the external power supply, would

cause near end crosstalk at the system end of the

loop wiring cable. Loops using FBM internal power

source do not require Baluns.

The Cable Balun module contains multiple Baluns.

One Balun segment is interconnected in each loop

powered from an external power supply per the

diagram above. There is one Cable Balun module.

Field Device Channels

VERSION SUPPORTED

HART Protocol v6

INTERFACE

8 group-isolated channels

COMMUNICATION TO THE DEVICE

Point-to-point, master/slave, asynchronous, half

duplex, at 1200 baud

ERROR CHECKING

Parity on each byte, and one CRC check byte

SPEED

2 messages per second

FASTEST ALLOWED ECB BLOCK PERIOD

500 msec

MAXIMUM DISTANCE (FBM216 TO FIELD

DEVICE)

Meets HART FSK physical layer specification

HCF_SPEC-54. Revision 8.1 [up to 3030 m

(10000 ft)](1)

COMPLIANCE VOLTAGE

18 V dc minimum at 20.5 mA

CURRENT INPUTS

Sense Resistor

61.9 Ω nominal

Total Input Resistance

280 Ω minimum

Analog Accuracy (Includes Nonlinearity)

± 0.075%(2) of full scale

Temperature Coefficient

50 PPM/°C

Resolution

15 bits

Update Rate

100 ms

Integration Time

500 ms

Common Mode Rejection

>100 db at 50 or 60 Hz

Normal Mode Rejection

>35 db at 50 or 60 Hz

LOOP POWER SUPPLY PROTECTION

Each channel is galvanically group isolated,

current limited, and voltage regulated.

All inputs are limited by their design to less than

30 mA with a single module installed (60 MA

when redundant modules are installed). If the

current limit circuit shorts out, the current is

limited to about 85 mA.

MAXIMUM LOOP RESISTANCE

280 Ω (not including the field device)(3)

FBM INPUT IMPEDANCE

280 Ω minimum

FBM INTERNAL POWER FOR FIELD DEVICE

24 V dc ±10% common power supply for all

channels. Loop load limited to one device per

channel.

ISOLATION

The channels are not galvanically isolated from

each other, but are galvanically isolated (both

optical and transformer isolation) as a group from

ground and module logic. Inputs use an internal

FBM isolated power supply for field power. The

module withstands, without damage, a potential

of 600 V ac applied for one minute between the

group isolated channels and earth (ground).

CAUTION

This does not imply that these channels are

intended for permanent connection to

voltages of these levels. Exceeding the limits

for input voltages, as stated elsewhere in this

specification, violates electrical safety codes

and may expose users to electric shock

FUNCTIONAL SPECIFICATIONS (CONTINUED)

Fieldbus Communication

Communicates with its associated FCM or FCP via

the redundant 2 Mbps module Fieldbus

Power Requirements

INPUT VOLTAGE RANGE (REDUNDANT)

24 V dc ±5%

CONSUMPTION

7 W (maximum)

HEAT DISSIPATION

4 W (maximum)

Regulatory Compliance

ELECTROMAGNETIC COMPATIBILITY (EMC)

European EMC Directive 89/336/EEC

Meets: EN 50081-2 Emission standard

EN 50082-2 Immunity standard

EN 61326 Annex A (Industrial Levels)

CISPR 11. Industrial Scientific and Medical

(ISM) Radio-frequency Equipment -

Electromagnetic Disturbance Characteristics - Limits and Methods of Measurement

Meets Class A Limits

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 on I/O, dc power and communication

lines

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 (rms) at 150 kHz to 80 MHz on I/O,

dc power and communication lines

IEC 61000-4-8 Power Frequency Magnetic

Field Immunity

30 A/m at 50 and 60 Hz

PRODUCT SAFETY

European Low Voltage Directive 73/23/EEC

SAFETY CERTIFICATION (FBM AND CABLE

BALUN)

Underwriters Laboratories (UL) for U.S. and

Canada

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. These 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

Subsystem User’s Guide (B0400FA). Where

power is supplied by the FBM,

communications circuits also meet the

requirements for Class 2 as defined in

Article 725 of the National Electrical Code

(NFPA No.70) and Section 16 of the

Canadian Electrical Code (CSA C22.1).

Conditions for use are as specified in the

I/A Series DIN Rail Mounted Subsystem

User’s Guide (B0400FA).

European Low Voltage Directive 73/23/EEC

and Explosive Atmospheres (ATEX) directive

94/9/EC

CENELEC (DEMKO) certified as EEx nA IIC

T4 for use in CENELEC certified Zone 2

enclosure certified as associated apparatus

for supplying non-incendive field circuits for

Zone 2. Group IIC, potentially explosive

atmospheres when connected to specified

I/A Series processor modules as described

in the I/A Series DIN Rail Mounted

Subsystem User’s Guide (B0400FA). Also,

see Table 1 on page 10.

Calibration Requirements

Calibration of the module or termination assembly is

not required

ENVIRONMENTAL SPECIFICATIONS(4)

Operating

TEMPERATURE

Module-20 to +70°C (-4 to +158°F)

Termination Assembly

PVC-20 to +50°C (-4 to +122°F)

PA-20 to +70°C (-4 to +158°F)

RELATIVE HUMIDITY

5 to 95% (noncondensing)

ALTITUDE-300 to +3.000 m (-1.000 to +10.000 ft)

Storage

TEMPERATURE-40 to +70°C (-40 to +158°F)

RELATIVE HUMIDITY

5 to 95% (noncondensing)

ALTITUDE-300 to +12.000 m (-1.000 to +40.000 ft)

Contamination

Suitable for use in Class G3 (Harsh) environments as

defined in ISA Standard S71.04. based on exposure

testing according to EIA Standard 364-65. Class III.

Vibration

7.5 m/S2 (0.75 g) from 5 to 500 Hz

PHYSICAL SPECIFICATIONS

Mounting

MODULE

FBM216 mounts on a modular baseplate. The

baseplate can be mounted on a DIN rail

(horizontally or vertically), or horizontally on a

19-inch rack using a mounting kit. Refer to

PSS 21H-2W6 B4 for details.

TERMINATION ASSEMBLY

The TA mounts on a DIN rail and accommodates

multiple DIN rail styles including 32 mm (1.26 in)

and 35 mm 1.38 in).

Mass

MODULE

284 g (10 oz) approximate

TERMINATION ASSEMBLY

Compression

181 g (0.40 lb) approximate

Ring Lug

249 g (0.55 lb) approximate

Dimensions – Module

HEIGHT

102 mm (4 in)

114 mm (4.5 in) including mounting lugs

WIDTH

45 mm (1.75 in)

DEPTH

104 mm (4.11 in)

Dimensions – Termination Assembly

See page 11.

Part Numbers

FBM216 MODULE

P0922VV

TERMINATION ASSEMBLIES

See “FUNCTIONAL SPECIFICATIONS –

TERMINATION ASSEMBLIES” on page 9

REDUNDANT ADAPTER

P0917XQ

Termination Cables

CABLE LENGTHS

Up to 30 m (98 ft)

CABLE MATERIALS

Polyurethane or Hypalon®/XLP

TERMINATION CABLE TYPE

Types 1 – See Table 2 on page 10.

CABLE CONNECTION – TA

25-pin male D-subminiature

Construction – Termination Assembly

MATERIAL

Polyvinyl Chloride (PVC), compression

Polyamide (PA), compression

PVC, ring lug

FAMILY GROUP COLOR

Green – communication

TERMINAL BLOCKS

3 tiers, 8 positions

Field Termination Connections

COMPRESSION-TYPE ACCEPTED WIRING

SIZES

Solid/Stranded/AWG

0.2 to 4 mm2/0.2 to 2.5 mm2/24 to 12 AWG

Stranded with Ferrules

0.2 to 2.5 mm2 with or without plastic collar

RING-LUG TYPE ACCEPTED WIRING SIZES

#6 size connectors (0.375 in (9.5 mm))

0.5 to 4 mm2/22 AWG to 12 AWG

TERMINATION ASSEMBLIES AND CABLES

Field input signals connect to the FBM subsystem via

DIN rail mounted Termination Assemblies, which are

electrically passive. TAs for the FBM216 are

available in the following forms:

Compression screw type using Polyvinyl Chloride

(PVC) material

Compression screw type using Polyamide (PA)

material

Ring lug type using PVC material

See the following “FUNCTIONAL SPECIFICATIONS –

TERMINATION ASSEMBLIES” for a list of TAs used

with the FBM216.

The FBM216 provides sufficient loop resistance to

allow use of the HART Hand-Held Terminal, or PC20

Intelligent Field Device Configurator (PSS 2A-1Z3 E).

A removable termination cable connects the DIN rail

mounted TA to the FBM via a field connector on the

baseplate in which the FBM is installed. Termination

cables are available in the following materials:

Polyurethane

Hypalon XLP.

Termination cables are available in a variety of

lengths, up to 30 meters (98 feet), allowing the

Termination Assembly to be mounted in either the

enclosure or in an adjacent enclosure. See Table 2

for a list of termination cables used with the TAs for

the FBM216.