Technical Specifications
Compatible Termination Assemblies
Note: Termination assemblies are sold separately. The P0917GY termination assembly is specifically designed for the FBM207c and should not be substituted with terminations intended for FBM207b (24 V) or other variants.
Key Features & Benefits
Dual-Mode Input Capability (Contact Sense or Voltage Monitor)
The FBM207c supports two distinct input modes: dry contact sensing (detecting switch/relay closures) and DC voltage monitoring (detecting on/off voltage states from field devices). This dual functionality allows a single module type to serve diverse digital input applications across the plant, simplifying spare parts inventory and reducing engineering complexity.
Sixteen Isolated Contact Sense Channels
The module provides 16 fully isolated, independent contact sense input channels, each capable of detecting dry contact closures from field devices. The per-channel galvanic isolation withstands 1500 V AC minimum, preventing a single field wire short or ground fault from crashing the entire input bank and triggering false interlock trips.
Configurable Input Debounce Filtering
The module supports software-configurable input debounce filtering with options for no filter, 4 ms, 8 ms, 16 ms, or 32 ms. This eliminates noise-triggered false status indications from motor start electrical noise and contact bounce, while preserving valid equipment fault signals.
Redundant Fieldbus Architecture
As a main-type FBM, the module independently connects to the redundant 2 Mbps Fieldbus. If one Fieldbus segment fails, the module automatically switches to the alternate path, maintaining continuous data exchange with the control processor without process interruption.
Hot-Swap Capability
The FBM207c supports live insert and removal on an energized I/A Series baseplate. Technicians can replace a failed unit without powering down the rack or disconnecting field wiring, minimizing Mean Time to Repair (MTTR) and enabling maintenance during continuous process operations.
Rugged Industrial Construction
Rated for Class G3 (Harsh) environmental contamination per ISA S71.04, the module operates reliably in corrosive chemical plants, coastal installations, and other demanding industrial settings. It operates across a temperature range of -40°C to +70°C with 5% to 95% non-condensing humidity.
Recommended Related Models
Compatible I/A Series Components:
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Control Processors: CP60, FCP270, FCP280
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Termination Assemblies: P0917GY (compression), RH917MG, P0917MJ (ring lug)
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Redundancy Adapter: RH926ZY
Frequently Asked Questions (FAQ)
Q1: What is the primary function of the Foxboro FBM207c (P0917GY)?
The FBM207c is a 16-channel contact sense/voltage monitor input module for the I/A Series DCS. It detects dry contact closures or DC voltage levels from field devices such as valve limit switches, motor starter auxiliary contacts, and breaker status contacts, converting these physical states into digital signals for the control processor via the redundant Fieldbus.
Q2: What wetting voltage does the FBM207c use?
The module operates with a 48 V DC contact wetting voltage (±15%), drawing approximately 3.2 mA short-circuit current per channel. This is distinct from the FBM207b, which uses 24 V DC wetting voltage.
Q3: What are the logic threshold specifications?
For contact sense applications, the module recognizes an on-state (closed contact) at ≤1.0 kΩ and an off-state (open contact) at ≥100 kΩ. For voltage monitor applications, on-state is 15 to 60 V DC and off-state is 0 to 5 V DC.
Q4: What debounce filter options are available?
The FBM207c supports software-configurable debounce filtering with options for no filter, 4 ms, 8 ms, 16 ms, or 32 ms per channel. This eliminates noise-triggered false status indications while preserving valid equipment signals.
Q5: Can the FBM207c be used in redundant configurations?
Yes. The module can be deployed in redundant pairs using the RH926ZY redundancy adapter. The system validates inputs across redundant modules, ensuring continuous operation during maintenance or failure.
Q6: Does the FBM207c support pulse counting?
Yes. The module supports pulse count inputs with no missed pulses for pulse rates from 0 to 250 Hz.
Q7: What is the difference between FBM207c and FBM207b?
The primary difference is the contact wetting voltage: the FBM207c uses 48 V DC, while the FBM207b uses 24 V DC. The termination assemblies are not interchangeable between these variants. Always verify the exact FBM model before ordering terminations.
Q8: Can the FBM207c be hot-swapped?
Yes. The module supports live insert and removal on an energized baseplate. However, best practice is to disable all 16 associated input channels in the control software before removal to prevent damage to internal optocoupler circuits.
Q9: What termination assembly is compatible with the FBM207c?
The P0917GY is the dedicated compression termination assembly for the FBM207c. Alternative options include the RH917MG (compression) and P0917MJ (ring lug). Never use termination assemblies designed for FBM207b or other variants, as mismatched internal terminal pinouts deliver incorrect voltage levels.
Q10: What environmental conditions can the FBM207c withstand?
The module is rated for Class G3 (Harsh) environmental contamination per ISA S71.04. Operating temperature is -40°C to +70°C, with storage from -40°C to +70°C. Humidity range is 5% to 95% non-condensing.
Q11: What are typical applications for the FBM207c?
The module is commonly used for: process control valve position feedback in chemical plants, safety interlock monitoring in oil and gas facilities, equipment status detection in power generation stations, alarm and event logging, and pump/motor status monitoring in water treatment systems.
Q12: What is the manual reference for the P0917GY?
The P0917GY is documented in Foxboro manual PSS 31H-2Z7, which provides detailed specifications, configuration guidelines, and installation instructions for the FBM207c module.
