Description
Component Snapshot At-a-Glance
- Model: P0916NG
- Alt. P/N: RH916FG/RH916FH (cable assemblies)
- Product Series: Foxboro I/A Series, FBM247 Pulse Input Module
- Hardware Type: Termination Assembly (TA) / DIN Mount Base for FBM247
- Key Feature: 8-channel isolated pulse/frequency termination with screw-clamp terminals
- Primary Field Use: Connect flow meters, tachometers, and pulse transmitters to I/A Series DCS.
Foxboro P0916NG
Hard-Numbers: Technical Specifications
- Protocol Support: I/A Series proprietary backplane ( mates with FBM247)
- Port Count: 8 isolated input channels (screw terminals)
- Frequency Range: 0.1 Hz – 50 kHz (FBM247 module)
- Input Voltage: -30 VDC to +30 VDC (NPN/PNP/dry contact compatible)
- Isolation Rating: Channel-to-channel & channel-to-backplane opto-isolation
- Operating Temperature: 0 °C to +60 °C
- Power Draw: 24 VDC backplane, 0.5 W typical
- Termination: Compression-type (C) terminals, 37-pin D-sub to
- Cable Type: Type 4 (P/PVC or LSZH), lengths 0.5–3 m
- Status Indicators: No onboard LEDs; status via module
The Real-World Problem It Solves
Field pulse signals (flow/tach) are low-amplitude and prone to ground loops. Direct wiring without isolation causes count errors or signal dropout.
Where you’ll typically find it:
- Refinery flow metering stations (turbine, vortex meters)
- Power plant turbine/generator tachometer monitoring
- Water treatment plant pulse-based totalizers
This TA provides isolated, screw-clamp terminations to stabilize pulse signals and simplify field wiring.
Hardware Architecture & Under-the-Hood Logic
Passive termination base—no onboard processor. Acts as a wired isolation barrier between field devices and .
- Field pulse signals land on screw terminals per channel.
- Internal traces route each channel to opto-isolator inputs on .
- Isolated 37-pin D-sub connects TA to module backplane.
- Shield drain connects to single-point cabinet ground (no field ground).
- Backplane bus carries isolated pulse data to I/A Series controller.
Field Service Pitfalls: What Rookies Get Wrong
Confusing ( TA) with FBM202 TA (P0916FH)
Rookies mix up (pulse input) and P0916FH (TC/mV). Mismatch causes no signal or module fault.
- Field Rule: Verify P/N and mating FBM: NG = (pulse); FH = FBM202 (TC/mV).
Over-Torquing Screw Terminals
Excess torque (over 0.8 Nm) cracks terminal blocks or loosens internal crimps—leads to intermittent counts.
- Quick Fix: Torque to 0.5–0.8 Nm. Use 16–22 AWG stranded wire with ferrules.
Daisy-Chaining Grounds Across Channels
Chaining field grounds creates ground loops. Induced noise causes erratic pulse counts at >10 kHz.
- Field Rule: Float all field commons. Drain shield only at cabinet ground; no field-side grounding.
Foxboro P0916NG
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
