FOXBORO FBM242 RH916T

Product Name: FBM242 16-Channel Externally Sourced Discrete Output Interface Module with RH916TA Termination Assembly

Product Introduction: FBM242 is a Compact 200 Series Field Bus Module in Foxboro I/A Series DCS. It converts control processor discrete commands into 16 isolated field outputs. RH916TA is the dedicated termination assembly shipped and ordered with this module variant.

Category: FOBORO

Description

Technical Specification:

Channels: 16 independent discrete outputs
Output Type: Externally sourced solid-state switch (MOSFET), dry-contact behavior
Output Voltage: 15–60 VDC, 120 VAC / 125 VDC, 240 VAC
Max Current: 2 A per channel at 60 VDC (2.25 A peak inrush for 20 ms), 1 A at 240 VAC
On-State Drop: ≤ 0.2 V at 2.25 A
Off-State Leakage: ≤ 0.1 mA
Module Power: 24 VDC ±10 %, redundant capable, 3 W idle, 6.5 W heat at full 1.5 A/ch load
Isolation: 600 VAC channel-to-channel and channel-to-ground
Communication: 2 Mbps redundant module field bus to CP/FCM
Diagnostics: Per-channel LED, open/short detection, BIST, fail-safe config
Fail-Safe: Configurable off / hold-last / pulse on comm loss or power loss
Environment: -20 °C to +70 °C operating, -40 °C to +85 °C storage, 5–95 % RH non-condensing, ISA G3
Dimensions: 104 × 45 × 114 mm
Weight: 0.284 kg
Certifications: CE, UL, CSA, ATEX Ex nA IIC T4

Material Composition: Aluminum-lithium alloy chassis, FR4 multilayer PCB with conformal coating, polycarbonate front lid, gold-plated backplane contacts.

Structural Feature: Horizontal insert into Compact baseplate; RH916TA sits below holding field wires; module extracts upward without disturbing TA wiring.

Working Principle: CP/FCP writes output image table to FBM242 over redundant field bus. Local FPGA/latch drives MOSFET gates. External field supply switches through MOSFET to load and returns to TA common. Loss of bus triggers fail-safe state machine.

Installation Requirement: Seat FBM242 in powered baseplate only after RH916TA field wiring inspected. Use 24 VDC instrument supply isolated from 120/240 VAC field supply. Fuse every channel at TA on inductive loads. Leave 1 slot ventilation gap in 8-wide FBM groups.

Usage Note: Do not feed 120 VAC into a 24 VDC-only configured channel group. Set fail-safe before valve actuators are mechanically connected. MOSFET outputs need freewheeling diode on DC solenoid loads.

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