Description

The Foxboro FBM214 is an analog/HART input module designed for process control and interface applications within the I/A Series system. The FBM214 contains eight group-isolated analog input channels, each supporting either a standard 4 to 20 mA analog signal or a digital HART Frequency Shift Keying (FSK) signal superimposed on a 4 to 20 mA analog input. Each channel features a dedicated FSK modem that enables bi-directional digital communication with connected HART field devices at 1200 baud. An integrated Sigma-Delta converter delivers 15-bit resolution and updates analog input values for all channels every 100 ms. The module serves as a HART communications field device host, handling point-to-point, master/slave digital message transfers at a rate of 2 messages per second using HART Protocol v6. It interfaces with the redundant 2 Mbps module Fieldbus and provides a common isolated 24 V dc internal power supply for loop-powered devices, with options for external power configurations using a Cable Balun module.

Features

• Eight group-isolated input channels accepting standard 4 to 20 mA or superimposed digital HART FSK signals.
• Dedicated FSK modem per input channel for bi-directional digital communications with HART devices.
• Onboard Sigma-Delta analog-to-digital converter providing 15-bit resolution and a 100 ms update rate per channel.
• Galvanic group isolation of all 8 input channels from ground and module logic.
• Support for HART Protocol v6 master/slave communication at 1200 baud with asynchronous, half-duplex transmission.
• Dual communication capability over redundant 2 Mbps Fieldbus path A and path B.
• Integrated isolated 24 V dc power supply for powering field transmitters across all channels.
• Compact, rugged extruded aluminum housing designed for mounting in Class G3 harsh environments.
• Front panel Light-Emitting Diodes (LEDs) for visual monitoring of operational status and channel communication activity.

Applications

• Interface for HART-enabled field transmitters (temperature, pressure, flow, level).
• Process control monitoring requiring high-accuracy 4 to 20 mA analog input acquisition.
• Distributed control system integration via redundant 2 Mbps Fieldbus networks.
• Hazardous area field wiring connections utilizing associated apparatus and non-incendive circuits.

Ordering Information

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Mounting: Mount the module onto a modular baseplate (4-slot or 8-slot options). The baseplate can be installed on a 32 mm or 35 mm DIN rail (horizontally/vertically) or horizontally on a 19-inch rack.
• Field Wiring: Connect field signals using a DIN rail-mounted Termination Assembly (TA) connected via a Type 1 termination cable to the baseplate field connector.
• Power Supply Configurations: When using external power for two or more loops on a common supply, install a Cable Balun Module (CBM-4) in each loop to prevent crosstalk and maintain signal line balance.
• Hot Swapping: The module supports removal and replacement without disrupting field device cabling, power, or system communication cables.
• Calibration: Operational calibration of the module or its termination assembly is not required.

Compliance and Certifications

• European EMC Directive 89/336/EEC: EN 50081-2 Emission, EN 50082-2 Immunity, EN 61326 Annex A (Industrial Levels), CISPR 11 Class A.
• IEC Immunity Standards: IEC 61000-4-2 (ESD), IEC 61000-4-3 (Radiated Field), IEC 61000-4-4 (EFT/Burst), IEC 61000-4-5 (Surge), IEC 61000-4-6 (Conducted), IEC 61000-4-8 (Magnetic Field).
• UL / UL-C Listing: Suitable for Class I, Groups A-D, Division 2, T4 enclosure systems; associated apparatus for non-incendive communication circuits.
• ATEX / CENELEC (DEMKO): Certified EEx nA IIC T4 for use in Zone 2 potentially explosive atmospheres per Directive 94/9/EC.
• European Low Voltage Directive: 73/23/EEC.