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

cabling, power, or communication cabling.

Redundant modules must be located in adjacent positions on the baseplate, with the

first module located in an odd-numbered position (for example, the positions labelled

"3" and "4"). To achieve redundancy, a redundant adapter module is placed on the two

adjacent baseplate termination cable connectors to provide termination for a single

cable. A single termination cable connects from the redundant adapter to the

associated termination assembly (TA).

When redundant, either module may be replaced without upsetting field input signals

to the good module. The module can be removed/replaced without removing field

device termination cabling, power, or communications cabling.

Redundant Modules in Foxboro DCS HMI

The redundant pair of modules appear as two independent modules to system

management software applications, such as Foxboro DCS System Manager and

System Manager/Display Handler (SMDH). The functional redundancy for these

modules is provided by their associated control blocks.

Sequence of Events

The Sequence of Events (SOE) software package (for use with I/A Series® v8.x

software and Control Core Services v9.0 or later) is used for acquisition, storage,

display, and reporting of events associated with digital input points in a control system.

SOE, using the optional GPS based time synchronization capability, supports data

acquisition across control processors at intervals of up to one millisecond, depending

on the signal source.

Refer to Sequence of Events (PSS 31S-2SOE) to learn more about this package, and

to Time Synchronization Equipment (PSS 41H-4C2), for a description of the optional

time synchronization capability.

Foxboro DCS with software earlier than V8.x can support SOE through ECB6 and

EVENT blocks. However, these systems do not support GPS time synchronization

and use a timestamp sent by the Control Processor which is accurate to the nearest

second and does not provide synchronization between different Control Processors.

Fieldbus Communication

A Fieldbus Communications Module or a Control Processor interfaces to the 2 Mbps

module Fieldbus used by the FBMs. The FBM217 accepts communication from either

path (A or B) of the 2 Mbps Fieldbus. If one path is unsuccessful or is switched at the

system level, the module continues communication over the active path.

Modular Baseplate Mounting

The module mounts on a DIN rail mounted baseplate, which accommodates up to four

or eight Fieldbus Modules. 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 located in odd and even adjacent positions on the

baseplate (positions 1 and 2, 3 and 4, 5 and 6, or 7 and 8). To achieve the

redundancy, a redundant adapter module is placed on the two adjacent baseplate

termination cable connectors to provide a single termination cable connection. A

single termination cable connects from the redundant adapter to the associated TA.

To system configurator applications and monitoring through SMON, System Manager,

and SMDH, redundant modules appear to be separate, nonredundant modules. The

functional redundancy for these modules is provided by their associated control

blocks.

Termination Assemblies

Field I/O signals connect to the FBM subsystem via DIN rail mounted TAs. The TAs

used with the FBM217 are described in Termination Assemblies And Cables, page 12.

Functional Specifications

FBM218 Module • Input:

32 group isolated channels

• On-State Voltage:

15 to 30 VDC

• Off-State Voltage:

0 to 5 VDC

• Current:

2.2 mA (typical) at 30 VDC Input

• Source Resistance Limits (Applies to All TAs):

◦ On-State:

1 kΩ (maximum) at 15 VDC

◦ Off-State:

100 kΩ (minimum) at 30 VDC

Filter/Debounce Time(1) Configurable (No Filtering, 4, 8, 16, or 32 ms)

Maximum Pulse Count Rate 250 Hz

Isolation

(Module/TA Combination)

For TAs that provide group isolation (RH916CA, RH916XZ, RH916YB,

RH916QA, RH924HA, RH924HP, RH924HQ, RH924HS, and RH924HT),

input channels are group isolated from ground. For details, see Standard

and Compact 200 Series Subsystem User's Guide (B0400FA). These

module/TA combinations can withstand, without damage, a potential of 600

VAC applied for one minute between the group isolated channels and

ground.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Although the module can withstand a maximum of 600 VAC applied for

one minute between any channel, DO NOTapply voltages beyond the

published input ranges. The channels are NOT intended for permanent

connection to hazardous voltage circuits. Understand that connection of

these channels to voltages greater than 30 VAC or 60 VDC violates

electrical safety code requirements and may expose users to electric

shock.

Failure to follow these instructions will result in death or serious

injury.

• High-voltage TAs RH916YB, RH916QA, and P0916QB:

Inputs are group-isolated.

These TAs can withstand UL required dielectric potentials.

• High-voltage TAs RH916YA, RH916PU, and P0916PV:

Inputs are channel isolated.

These TAs can withstand UL required dielectric potentials.

Communication Communicates with its associated FCM or FCP via the module Fieldbus

Power Requirements • Input Voltage Range:

24 VDC +5%, -10%

• Consumption:

3 W (maximum) at 24 VDC

• Heat Dissipation:

5 W (maximum) at 24 VDC (including contribution from field power

supply)

Calibration Requirements Calibration of the module and termination assembly is not required

Regulatory Compliance:

Electromagnetic Compatibility

(EMC)

• European EMC Directive 2004/108/EC (Prior to April 20, 2016) and

2014/30/EU (Beginning April 20, 2016):

Meets: EN61326-1:2013 Class A Emissions and Industrial Immunity

Levels

Regulatory Compliance: Product

Safety • Underwriters Laboratories (UL) for U.S. and Canada:

UL/UL-C listed as suitable for use in UL/UL-C listed Class I, Groups AD; Division 2; temperature code T4 enclosure based systems when

connected to specified Foxboro DCS processor modules.

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).For more

information, see Standard and Compact 200 Series Subsystem User's

Guide (B0400FA).

• European Low Voltage Directive 2006/95/EC (Prior to April 20, 2016)

and 2014/35/EU (Beginning April 20, 2016) and Explosive

Atmospheres (ATEX) directive 94/9/EC (Prior to April 20, 2016) and

2014/34/EU (Beginning April 20, 2016):

DEMKO certified as Ex nA IIC T4 for use in certified Zone 2 enclosure

when connected to specified processor modules as described in the

Standard and Compact 200 Series Subsystem User's Guide

(B0400FA). For use in an enclosure suited for an ATEX Zone 2

classified area.

RoHS Compliance Complies with European RoHS Directive 2011/65/EU, including amending

Directives 2015/863 and 2017/2102

IECEx Certification IECEx Certified

(1) Digital filtering available for 200 Series FBM or competitive migration modules with version 1.25H or later

firmware.

Environmental Specifications

Operating Storage

Temperature • FBM217 :

-20 to +70°C (-4 to +158°F)

• Termination Assembly - PA (Polyamide):

-20 to +70°C (-4 to +158°F)

-40 to +70°C (-40 to +158°F)

Relative

Humidity

5 to 95% (noncondensing) 5 to 95% (noncondensing)

Altitude -300 to +3,000 m (-1,000 to +10,000 ft) -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 0.75g from (5 to 500 Hz)

Physical Specifications

FBM217 Termination Assembly

Mounting The FBM217 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. Redundant modules must be

located in odd and even adjacent positions

on the baseplate (positions 1 and 2, 3 and 4,

5 and 6, or 7 and 8) along with the

appropriate redundancy adapter.

See Standard 200 Series Baseplates (PSS

41H-2SBASPLT) for details. Alternatively, a

non-redundant FBM217 mounts on a 100

Series conversion mounting structure. See

100 Series Conversion Mounting Structures

(PSS 41H-2W8) for details.

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)

Weight 284 g (10 oz) approximate Compression:

• 216 mm (8.51 in) – 420 g (0.93 lb,

approximate)

• 233 mm (9.15 in) – 454 g (1.0 lb,

approximate)

Dimensions • 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)

Compression Screw:

• See Dimensions - Nominal, page 21

Part Numbers • FBM217 Module:

RH914TR

• Redundant Adapter:

RH926ZY

See Functional Specifications - Termination

Assemblies, page 14

Termination Cables • Cable Lengths:

Up to 30 m (98 ft)

• Cable Materials:

Polyurethane or Low Smoke Zero Halogen

• Termination Cable Type:

◦ Baseplate to Main TA:

Type 4 - See Table 2, page 20

◦ Main TA to Expansion TA:

Type 6 - See Table 3, page 20

Cable Connection Type 4:

• FBM Baseplate End:

37-pin D-subminiature plug

• Termination Assembly End:

37-pin D-subminiature receptacle

Type 6:

• Main TA End:

25-pin D-subminiature receptacle

• Expansion TA End:

37-pin D-subminiature receptacle

Construction -

Termination

Assembly

• Material:

Polyamide (PA), compression

Field Termination

Connections

Compression — 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

Termination Assemblies and Cables

Field I/O signals connect to the FBM subsystem via DIN rail mounted termination

assemblies (TAs). Multiple types of TAs are available with FBM217 to provide input

signal connections, signal conditioning, optical isolation from signal surges and

external power connections for field devices. Since these features are built into the

termination assemblies (where required), in most applications there is no need for

additional termination equipment for field circuit functions such as circuit protection or

signal conditioning (including fusing and power distribution).

The termination assembly can be used with a single FBM217 or with a redundant pair

(two FBM217s).

The DIN rail mounted termination assemblies connect to the FBM subsystem

baseplate by means of removable termination cables. When used with a redundant

module pair, the termination assembly is connected to the baseplate using a

redundant adapter (RH926ZY).

The cables are available in a variety of lengths, up to 30 meters (98 feet), allowing the

termination assemblies to be mounted in either the enclosure or in an adjacent

enclosure. See Functional Specifications - Termination Assemblies, page 14 for

termination cable part numbers and specifications.

Migration Use of Termination Assemblies

When an FBM217 is used to replace 100 Series FBMs, its associated termination

assembly is determined based on which 100 Series FBM is being replaced. Typically,

the 100 Series FBM being replaced was a main FBM and may have been used in

conjunction with an expansion FBM.

A single FBM217 provides the I/O communications for both the 100 Series equivalent

main and expansion TAs. To provide enough terminals for the field input wiring, two

termination assemblies are used with the FBM217 - one for the field input wiring for

the replaced main FBM, and one for the field input wiring for the replaced expansion

FBM.

The “expansion” termination assembly is daisy-chained to the “main” termination

assembly via the expansion cables listed in Table 3, page 20.

See Functional Specifications - Termination Assemblies, page 14 for a list of the

termination assemblies needed to replace both the 100 Series main FBMs and the

expansion FBMs.

Alternatively, the FBM217 can accept field wiring through a Termination Assembly

Adapter (TAA) instead of the termination assemblies when upgrading 100 Series

FBMs. This is discussed in Termination Assembly Adapter Modules for 100 Series

Upgrade (PSS 41H-2W4)

Discrete Inputs

Various termination assemblies are available to support the interfacing of field signals

to the low level FBM input circuits. Active termination assemblies support input signal

conditioning for the FBM as well as channel isolation.

Be aware that for configurations which use main and expansion TAs, the I/O signal

conditioning circuits are designed to emulate the 100 Series FBM I/O subsystem. This

provides for functional I/O equivalence during upgrades from 100 Series to 200 Series

hardware.

The signal conditioning circuits are located on daughter boards that are mounted

under the component covers of the termination assemblies. To condition signals,

these termination assemblies provide optical isolation, current limiting, voltage

attenuation and optional terminal blocks to connect externally supplied excitation

voltage.

Low Voltage Discrete Inputs

The low voltage inputs (less than 60 VDC) use passive termination assemblies. Inputs

are voltage monitor or contact sense types. Voltage monitor inputs require an external

field voltage source. Contact sense inputs use the FBM auxiliary +24 VDCpower

supply to wet field contacts.

A load may be required for proper operation of the input channels.

High Voltage Discrete Inputs

The high voltage input circuits support 125 VDC, 120 VAC, or 240 VAC. Voltage

monitor inputs require a field voltage source.

Some versions of the termination assembly have a pair of external excitation voltage

terminals, which distribute customer-supplied wetting voltage to all input channels on

the assembly. These terminals allow the field power to be daisy chained between

terminal assemblies.

Functional Specifications - Termination Assemblies

FBM Type Input Signal TA Part

Number

PA(a)

Termination

Type(b)

BP to TA

Cable

Type(c)

TA Cert.

Type(d)

FBM217 32 channel, voltage monitor 30

VDC

Logic Zero – 0 to 5 VDC

Logic One – 15 to 30 VDC

Passive feedthrough with FBM217

group isolation

RH916CA C 4 1, 2, 4

FBM217 32 channel, contact sense

24 VDC contact wetting from FBM

Passive feedthrough with FBM217

group isolation

RH916XZ(e) C 4 1, 2, 4

FBM217 32 channel, voltage monitor 132

VAC or 150 VDC maximum

Logic Zero - 0 to 20 VAC; 0 to 20

VDC

Logic One - 80 to 132 VAC; 75 to

150 VDC

Input Current for Logic One; 2.6 mA

maximum

Channel isolation provided by

termination assembly

RH916YA(e) C 4 1, 4

FBM217 32 channel, contact sense inputs,

132 VAC or 150 VDC maximum

with external excitation

Logic Zero - 0 to 20 VAC; 0 to 20

VDC

Logic One - 80 to 132 VAC; 75 to

150 VDC

Input Current for Logic One; 2.6 mA

maximum

Group isolation provided by

termination assembly

RH916YB(e) C 4 1, 4

FBM217 32 channel, voltage monitor 240

VAC

Logic Zero: 0 to 40 VAC

Logic One: 164 to 264 VAC

Input Current for Logic One; 2.8 mA

maximum

Channel isolation provided by

termination assembly

RH916PU C 4 1

FBM Type Input Signal TA Part

Number

PA(a)

Termination

Type(b)

BP to TA

Cable

Type(c)

TA Cert.

Type(d)

FBM217 32 channel, contact sense inputs,

240 VAC with external excitation

Logic Zero: 0 to 40 VAC

Logic One: 164 to 264 VAC

Input Current for Logic One; 2.8 mA

maximum

Group isolation provided by

termination assembly

RH916QA C 4 1

FBM217 When replacing a main FBM07A:

Voltage monitor, external source,

130 VDC maximum voltage

Logic Zero: 0 to 5 VDC

Logic One: 15 to 130 VDC

2.2 mA typical 5 to 130 VDC

1 kΩ Maximum On-state resistance

100 kΩ Minimum Off-state

resistance

When replacing a main FBM07B:

Contact Sense, internal source 24

VDC ±10% Open circuit voltage

2.5 mA maximum short circuit

current

1 kΩ Maximum On-state resistance

100 kΩ Minimum Off-state

resistance

Pairs isolation provided by

termination assembly

RH924HA C 4 1, 2, 4

FBM217 When replacing a main FBM08:

Voltage monitor, external source,

132 VAC or 150 VDC maximum

voltage

Logic Zero: 0 to 20 VAC; 0 to 20

VDC

Logic One: 79 to 132 VAC; 75 to

150 VDC

2.2 mA typical 20 to 132 VAC

1 kΩ Maximum On-state resistance

100 kΩ Minimum Off-state

resistance

Channel isolation provided by

termination assembly

RH924HC C 4 1, 4