schneiderFoxboro™ DCS FBM217 Discrete Input Module PSS 41H-2S217 Product Specification May 2025

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The FBM217 Discrete Input Module provides 32 input channels, each accepting a 2-

wire input from a dc voltage source. Associated termination assemblies (TAs) provide

for discrete inputs of under 60 VAC, 120 VAC/125 VDC or 240 VAC. The module

performs signal conversion required to interface the electrical input signals from the

field sensors to the Module Fieldbus.

Depending on the type of I/O signal required, the TAs contain current limiting devices,

high voltage attenuation circuits, optical isolation and external power source

connections.

The module with its associated TA supports the following discrete inputs:

FBM217 30 VDC, 125 VDC, 120 VAC, or 240 VAC Voltage monitor or

Contact sense

The module can be used as a single unit, or as a redundant pair (two FBM217s).

When used as a redundant pair, the modules combine to provide redundancy at the

Foxboro DCS Fieldbus Module (FBM) level, with field input signals received from one

common termination assembly though a redundant adapter affixed to the FBMs'

baseplate. The field input current for redundant modules is doubled. A redundant

digital input block in the Foxboro DCS Control Software validates each input in

conjunction with information to/from the module, and selects the input with the highest

quality for processing in the control strategy.

In a redundant configuration, contact sense power from each module is diode OR'd

together in the redundant adapter to verify redundant power.

A redundant contact input function block, CINR, is used for each redundant pair of

inputs. The CINR block handles input reads and initialization logic for the redundant

channels. On each execution cycle of the CINR block, identical reads are sent to both

modules, fully exercising the fieldbus and the logic circuitry of each module.

When connected to the appropriate TAs, the FBM217 module provides functionality

formerly provided by the 100 Series FBM I/O subsystem. TAs are available which

support the functionality of the 100 Series main FBM07A/B, FBM08, FBM20, and

FBM24A/B/C (16 input main FBMs). Expansion TAs are available for use with these

main FBM TAs to support the functionality of expansion FBM12, FBM13, FBM21, or

FBM25A/B/C (16 input expansion FBMs).

Features

• 32 discrete inputs

• Supports discrete input signals at voltages of:

◦ 15 to 60 VDC

◦ 120 VAC/125 VDC

◦ 240 VAC

• Single or redundant modules

• Rugged design suitable for enclosure in Class G3 (harsh) environments

• Executes the programs for Discrete Input, Ladder Logic, Pulse Count, and

Sequence of Events, with the configurable options: Input Filter Time and FailSafe Configuration

• Various Termination Assemblies (TAs) that contain:

◦ High voltage attenuation and optical isolation for inputs

◦ External power connection for device excitation

Standard Design

FBM217 has a rugged extruded aluminum exterior for physical protection of the

circuits. Enclosures specially designed for mounting the FBMs provide various levels

of environmental protection.

Visual Indicators

Red and green light-emitting diodes (LEDs) incorporated into the front of the module

provide visual indication of the FBM operational status, as well as the discrete states

of the individual input points.

Easy Removal/Replacement

The module can be removed/replaced without removing field device termination