Component Snapshot At-a-Glance
- Model: Foxboro P0170PD
- Alt. P/N: No direct cross-reference; paired with FBM201/FBM207B
- Product Series: Foxboro I/A Series Legacy DCS
- Hardware Type: Fieldbus Communication Module (FCM)
- Key Feature: Redundant A/B 2 Mbps fieldbus + 10 Mbps Ethernet trunk
- Primary Field Use: Connects I/A Series controllers to remote FBM I/O racks via fiber/coax.
Hard-Numbers: Technical Specifications
- Protocol Support: Foxboro I/A Series Fieldbus (2 Mbps), Ethernet (10 Mbps)
- Port Count: 2× redundant fieldbus (A/B), 1× backplane interface
- Data Rate: 2 Mbps (fieldbus); 10 Mbps (Ethernet trunk)
- Operating Temperature: 0°C to +60°C, G3 industrial rated
- Isolation Rating: 500V (fieldbus ↔ backplane)
- Power Draw: 10–30 VDC, 250 mA max
- Mounting: DIN rail or standard I/A rack
- Status LEDs: Power, Link, Fault (front panel)
- Cabling: RG-62 coax or multimode fiber (2 Mbps fieldbus)
The Real-World Problem It Solves
Centralized I/O racks force hundreds of field wires into one cabinet—high noise, heavy cable runs, expensive installs. No distributed I/O means no way to split points across large plants.
Where you’ll typically find it:
- Refineries expanding I/O without replacing core I/A Series DCS
- Power plants retrofitting remote turbine/boiler skids
- Chemical plants using fiber to spread I/O across buildings
This module pushes I/O to the field, cuts wiring costs, and adds redundancy for uptime.
Hardware Architecture & Under-the-Hood Logic
It’s a dedicated communication bridge with its own processor—no I/O on board. Handles protocol conversion and redundancy switching.
- Host controller sends data over 10 Mbps Ethernet trunk.
- converts Ethernet to 2 Mbps fieldbus for FBMs.
- Redundant A/B ports auto-switch on link failure.
- FBMs (e.g., FBM207B) exchange I/O data via fiber/coax.
- Onboard diagnostics trigger Fault LED for link errors.
- Backplane reports status/configuration to DCS controller.
Field Service Pitfalls: What Rookies Get Wrong
Wrong Cable for 2 Mbps FieldbusTechs use standard Ethernet cable instead of RG-62 coax or multimode fiber. Result: high CRC errors, intermittent drops, no link.
- Field Rule: Only use Foxboro-specified RG-62 coax or multimode fiber for 2 Mbps fieldbus.
Skipping Redundancy Failover TestInstallers don’t simulate A/B path failure. A later cable break causes unplanned outage.
- Quick Fix: Pull A path; confirm switch to B in <500 ms; log event.
Overloading 24 VDC RailRookies daisy-chain too many on one supply. Voltage sags below 10 VDC; modules drop offline.
- Field Rule: Max 4 modules per 5 A 24 VDC supply; measure loaded voltage.
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.
