Foxboro RH916CA FBM217 Compact Discrete Input Module
Manufacturer: Foxboro
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Part Number: FBM217 RH916CA
Condition：New with Original Package
Product Type: Discrete Input Modules
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Foxboro FBM217 RH916CA Compact Discrete Input Module
The Foxboro FBM217 RH916CA, also cataloged as the FBM217 Compact Discrete Input Module, operates as a dedicated hardware component for collecting 32-channel 24 VDC discrete signals within Foxboro I/A Series and Evo platforms. The module processes physical contact status and high-speed pulse inputs from field switches, transmitting binary logic states directly across the redundant Fieldbus backplane interface.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | Foxboro FBM217 RH916CA |
| Brand | Foxboro |
| Origin | United States |
| Weight | 0.30 kg |
| Dimensions | Standard Foxboro Compact Form Factor |
| Operating Temp | -20 deg C to +60 deg C |
| Power Consumption | 3 W |
| Product Type | Compact Discrete Input Module |
| Input Channels | 32 group-isolated discrete inputs |
| Nominal Input Voltage | 24 VDC (+5%, -10%) |
| On-State Voltage | 15-30 VDC |
| Off-State Voltage | 0-5 VDC |
| Typical Input Current | 2.2 mA at 30 VDC |
| Source Resistance | On <= 1 k ohm, Off >= 100 k ohm |
| Input Filtering | Configurable: none, 4, 8, 16, 32 ms |
| Maximum Pulse Rate | Up to 250 Hz |
| Heat Dissipation | 5 W |
| Fieldbus Interface | Redundant Fieldbus communication |
Process Control & Signal Conditioning Features
The Foxboro FBM217 RH916CA incorporates group electrical isolation to suppress common-mode electrical noise across crowded control enclosures. Each input group filters raw field signals through user-configurable debounce timers (up to 32 ms) to prevent mechanical contact bounce from triggering false control logic interrupts. Integrated high-speed pulse processing circuitry detects rapid transitions up to 250 Hz, routing precise discrete state data over the dual Fieldbus interface to maintain deterministic execution across Foxboro Evo control systems.
Frequently Asked Questions
Q: How do configurable debounce parameters affect input signal processing on the FBM217 RH916CA?
A: Debounce filtering delays signal state updates by the selected interval (4, 8, 16, or 32 ms) to ensure mechanical switch contacts settle fully before updating internal registers, eliminating false transitions caused by contact chatter.
Q: Can the FBM217 RH916CA module be inserted or removed while the backplane is powered?
A: Yes. The module supports live insertion and removal on active Foxboro baseplates. Technicians can replace a unit online without causing signal disruptions to surrounding modules or breaking communication on the redundant Fieldbus lines.
Q: What mechanisms prevent electrical noise on one field group from affecting adjacent channels?
A: Internal group galvanic isolation decouples field wiring groups from one another and from the module's backplane electronics, diverting high-voltage transients and preventing ground loops from interfering with internal bus logic.
Field Installation Guidelines
Strict adherence to mechanical mounting and wiring practices preserves physical noise immunity and operational integrity:
- Snap the compact module securely onto the targeted baseplate slot until the locking tab fully engages the backplane connector.
- Tighten panel retention screws to secure physical chassis ground contact and prevent mechanical displacement from field vibration.
- Separate 24 VDC discrete field cables from high-voltage AC lines inside panel wiring ducts to reduce inductive noise coupling.
- Route field shield wires directly to the cabinet instrumentation earth bus using a single termination point to prevent circulating ground loop currents.
- Install protective slot covers on all empty baseplate positions to ensure correct convection air paths across adjacent module heatsinks.