Description
Core Product Summary (Brand / Model / Key Attributes)
The Foxboro FBM242 (with associated termination assembly RH916YZ) is a 16-channel Externally Sourced Discrete Output Module for the Foxboro I/A Series and EcoStruxure Foxboro DCS 200 Series subsystem. It drives field devices such as solenoids, motor starters, and indicators using an external power source.
The module provides 16 galvanically isolated discrete outputs rated up to 2 A at 60 VDC. Associated termination assemblies, including RH916YZ, support solid-state or relay outputs at 15–60 VDC, 120 VAC/125 VDC, or 240 VAC, and may include power distribution and fusing. Channels are group-isolated when used with external excitation. The module executes Discrete I/O or Ladder Logic application programs with configurable fail-safe options and is rated for Class G3 harsh environments.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Externally Sourced Discrete Output Module |
| Output Channels | 16 isolated discrete outputs |
| Output Type | Switch (externally sourced) |
| Supported Voltages (via TA) | 15–60 VDC; 120 VAC/125 VDC; 240 VAC |
| Applied Voltage (DC) | 15 to 60 VDC maximum |
| Load Current | 2.25 A maximum per channel |
| In-Rush Current | 8 A max for 20 ms (at 30 °C); 6.4 A max for 20 ms (at 70 °C) |
| On-State Voltage Drop | 0.2 V maximum at 2.25 A |
| Off-State Leakage Current | 0.1 mA maximum |
| Isolation | Galvanic isolation, channel-to-channel and channel-to-ground (group isolation with external excitation) |
| Application Programs | Discrete I/O or Ladder Logic |
| Configurable Options | Fail-Safe Configuration, Fail-Safe Fall-Back, Sustained or Momentary Outputs |
| Communication | Redundant 2 Mbps module Fieldbus |
| Power Supply (Redundant) | 24 V DC +5 % / –10 % |
| Power Consumption | 3 W maximum |
| Heat Dissipation | 6.5 W maximum (full load) |
| Environmental Rating | Suitable for Class G3 (harsh) environments |
| Associated TA (example) | RH916YZ (SPDT Form C relays with power distribution) |
Detailed Product Overview
The Foxboro FBM242 is a high-density discrete output module that interfaces the control system to field actuators using an external power source. Each of the 16 channels is galvanically isolated from the others and from system ground, providing strong protection against ground loops and electrical noise. When used with external excitation the channels are group-isolated.
The module itself handles solid-state switching up to 2.25 A at 60 VDC. Associated termination assemblies expand the capability to higher voltages and currents or add relay contacts, fusing, and power distribution. The RH916YZ termination assembly, for example, provides SPDT (Form C) relay outputs with power distribution, supporting loads up to 5 A at various DC and AC voltages while maintaining group isolation.
The FBM242 executes Discrete I/O or Ladder Logic application programs. Configurable options include fail-safe configuration, fail-safe fall-back values, and sustained or momentary output modes. Inductive loads typically require a protective diode or MOV across the load. The module communicates with the associated Fieldbus Communications Module or Field Control Processor over the redundant 2 Mbps module Fieldbus and is designed for Class G3 harsh industrial environments.
FBM242 RH916YZ
FBM242 RH916YZ
Engineering Selection Highlights
- Select FBM242 when 16 high-density, externally powered discrete outputs are required.
- Match the termination assembly (such as RH916YZ) to the required voltage, current, isolation, and power-distribution needs.
- Confirm external field power supply capacity and polarity for the chosen TA.
- Use protective diodes or MOVs on inductive loads to protect the output switches.
- Configure fail-safe and fall-back options to meet process continuity or safety requirements.
- Choose sustained or momentary output modes according to the actuator or interlock logic.
- Verify that the total heat dissipation and power budget of the baseplate remain within limits at full load.
- Confirm that control software is set for the Discrete I/O or Ladder Logic application program.
Dimensions, Mounting & Connection Notes
The FBM242 is a standard 200 Series Fieldbus Module (approximately 102–114 mm high × 45 mm wide × 104 mm deep including mounting features). It mounts on a DIN-rail or modular baseplate. Field wiring and external power connections are made on a dedicated termination assembly such as RH916YZ. The module can be removed or replaced without disconnecting field wiring, power, or communication cabling. Installation follows normal 200 Series practices and must remain within Class G3 environmental limits.
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| System Family | Foxboro I/A Series / EcoStruxure Foxboro DCS | 200 Series Fieldbus Module subsystem |
| Fieldbus | Redundant 2 Mbps module Fieldbus | Connects to FCM or FCP |
| Power Supply (Module) | Redundant 24 V DC +5 % / –10 % | 3 W maximum consumption |
| Field Power | External power source | Supplied via the termination assembly |
| Termination Assembly | Voltage- and function-matched TA (e.g., RH916YZ) | Determines output type, current rating, and isolation |
| Isolation Scheme | Channel isolation (group isolation with external excitation) | High noise immunity |
| Application Programs | Discrete I/O or Ladder Logic | Configurable fail-safe and output mode options |
| Environmental | Class G3 (harsh) | Suitable for industrial process areas |
FAQ
What is the Foxboro FBM242 RH916YZ?
The Foxboro FBM242 is a 16-channel externally sourced discrete output module. RH916YZ is one of the associated termination assemblies that provides SPDT relay outputs with power distribution.
How many output channels does it have?
Sixteen galvanically isolated discrete output channels.
What voltages and currents are supported?
Solid-state switching up to 2.25 A at 60 VDC on the module; higher voltages and currents (including 120/240 VAC) via appropriate termination assemblies such as RH916YZ.
Is external power required?
Yes. Field circuits are powered from an external source supplied through the termination assembly.
What application programs does it support?
Discrete I/O or Ladder Logic, with configurable fail-safe configuration, fall-back, and sustained or momentary output modes.
What isolation is provided?
Each channel is galvanically isolated from other channels and from ground. Group isolation applies when external excitation is used.
Is the module suitable for harsh environments?
Yes. It is rated for Class G3 (harsh) industrial environments.
Verification & Troubleshooting Notes
- Confirm module identity by the FBM242 designation and the associated TA part number (e.g., RH916YZ) on the labels and by successful recognition on the Fieldbus.
- Verify that the external field power supply matches the voltage and current requirements of the selected termination assembly.
- Check that the 24 V DC redundant baseplate power is present and within tolerance.
- Observe channel status LEDs and control-system diagnostics for output command verification.
- Confirm that protective diodes or MOVs are fitted on inductive loads.
- Review fail-safe and output-mode settings to ensure they match process requirements.
- Module replacement can be performed without removing field wiring; always verify power, Fieldbus integrity, and correct TA matching after replacement.
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