Overview
The Foxboro RH914TA, also cataloged as the FBM242 16-Channel Discrete Output Module, operates as a dedicated hardware component for externally sourced discrete signal switching within the EcoStruxure Foxboro DCS platform.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | FBM242 (RH914TA / RH916TA) |
| Brand | Foxboro (Schneider Electric) |
| Product Type | 16-Channel Discrete Output Modules |
| System Platform | EcoStruxure Foxboro DCS / I/A Series 200 Series |
| Origin | USA |
| Weight | Approx. 284 g |
| Dimensions | Height: 102 mm, Width: 45 mm, Depth: 104 mm |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | Maximum 3 W at 24 VDC |
| Heat Dissipation | Maximum 6.5 W at 24 VDC with all outputs loaded |
| Channel Count | 16 isolated discrete output channels |
| Output Type | Externally sourced switch output |
| Applied Voltage Range | 15 to 60 VDC maximum |
| Load Current | 2.25 A maximum per channel |
| Load In-Rush Current | 8.0 A for 20 ms at 30 deg C; 6.4 A for 20 ms at 70 deg C |
| On-State Voltage Drop | 0.2 V maximum at 2.25 A |
| Off-State Leakage Current | 0.1 mA maximum |
| Channel Isolation | 600 VAC for 1 minute channel-to-channel or channel-to-ground |
| Input Power Supply | 24 VDC +5%, -10% redundant supply |
| Humidity Range | 5 to 95% non-condensing |
| Altitude Range | -300 to +3,000 m |
| Environmental Rating | ISA S71.04 Class G3 harsh contamination level |
| Field Connection | 37-pin male D-subminiature connector to Termination Assembly |
Foxboro DCS Discrete Output Isolation and Control Features
The FBM242 uses channel-to-channel isolation to separate field output circuits and reduce electrical interference between connected devices. Moreover, each output channel maintains galvanic isolation from earth ground, which helps prevent unwanted current paths in distributed control installations.
The module receives control commands from the Foxboro DCS controller and switches externally supplied DC power to connected field equipment. Therefore, it supports direct operation of discrete devices including solenoid valves, relays, actuators, and motor starter interfaces.
In addition, the FBM242 supports configurable fail-safe output behavior. During communication loss or system fault conditions, the module can execute predefined fallback actions, including output de-energization or state holding according to application configuration.
For Foxboro process I/O applications, the module architecture follows DCS signal conditioning requirements, including isolated field circuits and controlled discrete switching. Furthermore, the isolated design supports installation in environments where multiple field devices operate with different electrical references.
Frequently Asked Questions
Q: Does the FBM242 require an external field power source for output operation?
A: Yes. The FBM242 uses externally sourced output power and switches field voltage supplied from an external source.
Q: Can the FBM242 be replaced while field wiring remains connected?
A: Yes. The module supports hot-swappable replacement without disconnecting termination cabling, system power, or communication connections.
Q: What type of electrical isolation does the FBM242 provide?
A: The module provides galvanic isolation between individual output channels and between channels and earth ground, with isolation withstand capability of 600 VAC for 1 minute.
Field Installation Guidelines
Install the FBM242 in the designated Foxboro 200 Series mounting position and verify that the module is correctly seated before applying system power.
Connect the 37-pin D-subminiature interface to the approved Termination Assembly using the specified field wiring configuration. Maintain proper cable routing separation between discrete output wiring and high-voltage power conductors to reduce electrical noise coupling.
Ensure that external field power sources match the required DC voltage range before connecting output loads. Additionally, verify grounding practices for cabinet shielding and termination points according to site electrical standards.
When replacing the module, confirm that the system controller recognizes the new hardware configuration and verify discrete output states before returning connected field devices to normal operation.
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