Foxboro FBM215 / FBM218 Product Description

The Foxboro FBM215 and FBM218 are high-performance, 8-channel isolated HART analog output modules belonging to the Compact 200 Series I/O Subsystem for Foxboro I/A Series and Foxboro Evo™ distributed control systems (DCS), manufactured by Foxboro (Schneider Electric). The FBM215 is the standard HART analog output module, while the FBM218 is its redundant counterpart, designed for critical process applications requiring maximum uptime and fault tolerance. Both modules serve as the key interface between the DCS and field-mounted 4–20 mA actuators, control valves, positioners, and HART-enabled smart devices, delivering precision analog control with superimposed bidirectional HART communication. They replace legacy 100 Series FBM I/O functionality in a compact, rugged form factor, optimized for mixed analog and HART device environments across all process industries.

The FBM215 (part numbers RH922VU / P0922VU) provides eight fully galvanic-isolated output channels, each delivering a 4–20 mA analog signal or a HART Frequency Shift Keying (FSK) digital signal superimposed on the analog output. This supports any mix of conventional analog actuators and HART smart devices on the same module. As a HART master, it integrates per-channel FSK modems for bidirectional communication, enabling the DCS to send control commands, read device diagnostics, and perform remote configuration at up to two digital messages per second per channel. High precision is ensured with 13-bit resolution and typical accuracy of ±0.05% of span (including linearity), a maximum output load of 750 Ω per channel, and a 20 mA response time within 60 ms. Full channel-to-channel and channel-to-system galvanic isolation (500 VDC rating) eliminates ground loops, electrical crosstalk, and transient voltage damage. Each channel includes an isolated 24 V DC loop power supply with current limiting and voltage regulation, supporting both internally and externally powered field devices. Rugged construction features an extruded aluminum enclosure and conformal-coated PCB, rated for Class G3 harsh environments per ISA S71.04. Front-panel LED indicators display module power, channel activity, and fault status for quick troubleshooting. It supports HART protocol versions 5/6/7 and all universal/common practice commands via Telegram Pass-Through (burst mode not supported), with a maximum field wiring distance of 3030 m (10,000 ft) under optimal conditions. Hot-swap capability allows module replacement without system shutdown.

The FBM218 is a redundant 8-channel HART analog output module, sharing core functionality with the FBM215 but adding dual-module parallel operation and seamless fault tolerance for high-availability applications. It provides eight galvanic-isolated output channels (600 VAC isolation rating for one minute) supporting 4–20 mA analog and HART-superimposed signals, with per-channel FSK modems for bidirectional HART communication. Key enhancements over the FBM215 include redundant channel architecture, where each output channel is backed by a redundant circuit, enabling automatic, bumpless switchover within milliseconds if the primary channel fails. It also supports redundant module pairing, allowing two FBM218 modules to operate in a primary/standby configuration for complete I/O path redundancy. Precision performance matches the FBM215 with 13-bit resolution, ±0.05% span accuracy, 750 Ω maximum load, and 60 ms response time. Environmental ruggedness is identical, with an aluminum enclosure, conformal-coated PCB, and Class G3 harsh environment rating. Additional diagnostic features monitor redundant channel health, data consistency via bit-wise matching, and switchover events for enhanced fault visibility. It supports the same HART protocol versions (5/6/7) and commands as the FBM215, with the same maximum wiring distance. Hot-swap capability is retained, with redundant modules supporting online replacement of either primary or standby unit without process interruption.

Manufactured by Foxboro (Schneider Electric), both modules are fully compatible with Foxboro I/A Series (v8.4–v8.8) and Foxboro Evo™ (v9.0+) DCS platforms. Output signal range is 4–20 mA DC, supporting analog-only or HART-superimposed signals. Communication protocol is HART (FSK, 1200 baud), point-to-point master/slave half-duplex with parity and CRC error checking. Resolution is 13-bit, with analog accuracy ±0.05% of span (4–20 mA). Output load is 750 Ω maximum per channel, response time 60 ms for 20 mA change. Isolation is full galvanic (500 VDC for FBM215, 600 VAC for FBM218) between channels and system logic. Power supply is 24 V DC (18–32 VDC operating range), redundant power support, maximum power consumption 8.5 W (FBM215) / 9.5 W (FBM218). Operating temperature ranges from –20 °C to +70 °C (–4 °F to +158 °F), storage temperature –40 °C to +85 °C (–40 °F to +185 °F), with 5%–95% non-condensing relative humidity. Enclosure is extruded aluminum with conformal-coated PCB, rated IP20. Dimensions for FBM215 are approximately 147 mm × 51.5 mm × 115 mm (5.8 in × 2.0 in × 4.5 in), weight 0.32 kg (0.71 lb). Dimensions for FBM218 are approximately 147 mm × 51.5 mm × 115 mm (5.8 in × 2.0 in × 4.5 in), weight 0.37 kg (0.82 lb). Certifications include CE, UL, CSA, and compliance with ISA S71.04 for harsh environments.

Both modules are deployed across process control industries requiring precision analog output and HART device integration, with the FBM218 reserved for critical applications demanding redundancy. In chemical and petrochemical plants, they interface with HART-enabled control valves, positioners, and variable-frequency drives on reactors, distillation columns, and pipelines, delivering accurate control signals while enabling remote diagnostics and configuration of smart actuators. In oil and gas facilities, including refineries, offshore platforms, and gas processing stations, they regulate critical parameters in refining processes, compressor stations, and wellhead operations, supporting both analog and HART devices for operational safety and efficiency. In power generation plants, they connect to HART control valves and actuators for boiler, turbine, and auxiliary system control, enhancing precision and reducing maintenance costs via HART diagnostics. In water and wastewater treatment plants, they interface with HART-enabled control valves and dosing pumps, supporting process regulation and regulatory compliance through device monitoring. In pharmaceutical and food and beverage industries, they ensure precise control of critical process parameters while meeting strict regulatory requirements via HART device validation and diagnostics. The FBM218 is specifically used in safety-critical loops, such as emergency shutdown systems, high-pressure reactor controls, and offshore platform critical actuators, where zero downtime is mandatory.

Both modules install on standard DIN rails in Foxboro I/A Series or Evo™ DCS cabinets, connecting to the system via a dedicated Compact 200 Series baseplate for power and communication. Field wiring connects to a compatible termination assembly (TA), supporting both local and remote wiring, as well as internal or external loop power for the channels. System configuration is performed via Foxboro DCS software and the Intelligent Field Device Configurator (IFDC), allowing users to enable/disable channels, set HART communication parameters, configure diagnostic alarms, and scale analog output ranges. Both modules are plug-and-play compatible with existing Foxboro systems, requiring minimal on-site setup and supporting hot-swap replacement for maintenance without system shutdown. They integrate seamlessly with other Compact 200 Series modules, including controllers, input modules, and communication cards, forming a unified, scalable process control solution. For FBM218 redundant operation, additional configuration in the DCS software enables redundant channel/module pairing, switchover logic, and health monitoring.

Routine maintenance for both modules 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 accuracy, HART communication integrity, and loop supply voltage 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. Both products come with a standard 12-month warranty against manufacturing defects, with extended warranty options available to support long-term operational reliability. For FBM218 redundant systems, additional maintenance tasks include periodic testing of redundant switchover functionality to ensure fault tolerance readiness.