Foxboro FBM219 Product Description

The Foxboro FBM219 is a compact, high-density mixed discrete input/output (I/O) module in the Foxboro Compact 200 Series, designed for Foxboro I/A Series and Foxboro Evo™ distributed control systems (DCS). It provides a cost‑effective, space‑saving solution for monitoring and controlling on‑site digital devices, integrating 24 discrete input channels and 8 discrete output channels into a single rugged unit. Engineered for group isolation, broad voltage compatibility, and reliable performance in harsh industrial environments, the FBM219 serves as the critical interface between field devices—such as limit switches, pressure switches, valve positioners, relays, and motor starters—and the DCS controller. Its support for configurable logic, fault‑safe operation, and hot‑swap capability makes it ideal for general‑purpose and high‑availability process control applications across industries.

The FBM219 combines 24 group‑isolated discrete inputs and 8 group‑isolated discrete outputs, with electrical separation between channel groups, field circuits, and the DCS backplane to eliminate ground loops, crosstalk, and transient damage. Inputs accept both dry contact closures and active voltage signals across three standard ranges: 15–60 V DC, 120 V AC / 125 V DC, and 240 V AC. Outputs switch low‑to‑medium voltage loads, with ratings compatible with 30 V DC, 125 V DC, 120 V AC, or 240 V AC devices, depending on the termination assembly (TA) used.

Each input channel includes configurable filter/debounce times (no filtering, 4 ms, 8 ms, 16 ms, or 32 ms) to suppress contact bounce and electrical noise, ensuring stable on/off state detection. Input threshold levels are defined for consistent sensing: on‑state ≥2.1 mA, off‑state ≤1.2 mA, with a typical input current of 2.2 mA at 30 V DC. The module supports sequence‑of‑events (SOE) logging with high time resolution for precise state‑change timestamping, aiding in diagnostics and compliance.

Output channels are configurable for sustained or momentary operation, with user‑defined fail‑safe modes (fail open, fail closed, or hold last state) to ensure safe behavior during communication or power faults. Output switching is handled via relay contacts in compatible TAs, with electrical life ratings of 100,000 operations at full resistive load and 5 million operations under no‑load conditions.

Communication with the DCS controller (FCP/ZCP) or fieldbus communication module (FCM) uses a redundant 2 Mbps HDLC fieldbus with automatic A/B path failover, preventing data loss during communication path faults. The module supports hot‑swap capability, allowing online replacement without shutting down the DCS or interrupting process control.

Rugged construction includes an extruded aluminum enclosure and conformal‑coated PCB, rated for ISA S71.04 Class G3 harsh environments to resist dust, moisture, vibration (0.75 m/s², 5–500 Hz), and wide temperature fluctuations. Front‑panel LED indicators display module power, channel status, and fault conditions for quick on‑site troubleshooting.

Manufacturer: Foxboro (Schneider Electric)Compatible Systems: Foxboro I/A Series, Foxboro Evo™ DCSChannel Configuration: 24 discrete input channels, 8 discrete output channels, all group‑isolatedInput Signal Types: Dry contact closures; voltage signals (15–60 V DC, 120 V AC / 125 V DC, 240 V AC)Output Signal Ratings: 30 V DC (0.25 A or 5 A), 125 V DC (0.6 A), 120 V AC (5 A), 240 V AC (5 A) via TAsInput Thresholds: On‑state ≥2.1 mA; Off‑state ≤1.2 mA; Typical input current 2.2 mA at 30 V DCFilter/Debounce Times: Configurable (none, 4 ms, 8 ms, 16 ms, 32 ms)SOE Resolution: High‑precision timestamping for state‑change eventsCommunication: Redundant 2 Mbps HDLC fieldbus, A/B path redundancy with automatic failoverPower Supply: 24 V DC (operating range: 18–32 V DC, +5% / -10% tolerance); Max power consumption 3 WOperating Temperature: –20 °C to +70 °C (–4 °F to +158 °F)Storage Temperature: –40 °C to +70 °C (–40 °F to +158 °F)Relative Humidity: 5%–95% non‑condensingAltitude: –300 m to +3,000 m (–1,000 ft to +10,000 ft)Enclosure: Extruded aluminum, conformal‑coated PCB; IP20 ratingDimensions: Approximately 102 mm × 45 mm × 104 mm (4.0 in × 1.8 in × 4.1 in)Weight: 0.3 kg (0.66 lb)Certifications: CE, UL, CSA, ABS Type Approval, Bureau Veritas Marine; compliant with ISA S71.04 Class G3

The FBM219 is widely deployed across process industries requiring compact, reliable mixed discrete I/O for monitoring and control. In chemical and petrochemical plants, it interfaces with limit switches, pressure switches, and valve position sensors on reactors, distillation columns, and pipelines, while controlling solenoid valves, motor starters, and alarm beacons for process control and safety interlock systems.

In oil and gas facilities, including refineries, offshore platforms, and gas processing stations, it monitors emergency shutdown (ESD) switches, fire and gas detectors, and pump/compressor status contacts, and controls shutdown valves and vent actuators to ensure safe, efficient hydrocarbon production.

In power generation plants, it connects to turbine supervisory switches, boiler limit sensors, and auxiliary equipment status indicators, while controlling lubrication pumps, cooling fans, and damper actuators for reliable power plant operation. In water and wastewater treatment plants, it interfaces with level switches, flow switches, and valve position indicators, and controls dosing pumps, gate valves, and aeration blowers for precise treatment process control.

In pharmaceutical, food and beverage, and manufacturing industries, the FBM219 monitors production line sensors, conveyor switches, and safety interlocks, while controlling packaging machinery, sorting gates, and safety barriers to ensure process efficiency and regulatory compliance. Its compact size and mixed I/O design make it ideal for cabinets with limited space, while redundant communication and hot‑swap features support high‑availability and safety‑critical applications.

The FBM219 installs on standard DIN rails in Foxboro I/A Series or Evo™ DCS cabinets, mounting on a dedicated Compact 200 Series baseplate for power and redundant fieldbus communication with the DCS backplane. Field wiring connects to a compatible termination assembly (TA), which provides voltage attenuation, optical isolation, surge protection, and relay outputs for field devices. Multiple TA types are available to support the three voltage input ranges and various output load ratings, allowing flexibility in field device integration.

Standard industrial shielded cables are recommended for field wiring, with proper grounding to optimize noise immunity and ensure reliable signal transmission. Input channels accept either internal (via TA) or external power for field devices, while output channels use relay contacts in the TA to switch load currents.

System configuration is performed via Foxboro DCS software, enabling users to set input filter times, configure SOE logging, define output fail‑safe modes, and select sustained or momentary output operation. For redundant communication, the module is configured to utilize both A and B fieldbus paths, with automatic failover logic. The module is plug‑and‑play compatible with existing Foxboro systems, requiring minimal on‑site setup and supporting hot‑swap replacement for maintenance without system shutdown. It integrates seamlessly with other Compact 200 Series modules, including controllers, analog I/O modules, and communication cards, forming a unified, scalable process control solution.

Routine maintenance for the FBM219 includes visual inspection of the aluminum enclosure for physical damage, dust accumulation, or loose connections, and verification of front‑panel LED indicators for normal operation. Periodic testing of channel status, input threshold accuracy, output relay functionality, and communication integrity is recommended, especially in high‑vibration, corrosive, or strong electromagnetic interference environments. The conformal coating on the PCB protects against moisture and dust, reducing the need for frequent cleaning.

Faulty modules can be repaired by authorized Schneider Electric service providers, with standard repair times of 2–4 weeks and expedited options available for critical applications. The FBM219 comes with a standard 12‑month warranty against manufacturing defects, with extended warranty options available to support long‑term operational reliability. For redundant communication configurations, periodic testing of path failover functionality is recommended to ensure fault tolerance readiness.