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

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