Configured for high-density analog and digital signal interface tasks in Foxboro I/A Series distributed control systems, the Foxboro P0916FH, also cataloged as the P0916FH PLC Module, provides direct physical/electrical execution. It serves as the physical connectivity link between field instruments and the system backplane, managing a maximum of 16 configurable input/output channels. The subsystem incorporates a dedicated interface cable, designated as P0916FH-C, which provides a 1-meter physical termination pathway between the active electronic module and the associated FBM2xx field termination assembly.
| Parameter | Specification |
|---|---|
| Model | P0916FH / P0916FH-C |
| Brand | Foxboro (Invensys) |
| Origin | United States |
| Weight | 2.0 kg (Module), 480 g (Pulse Assembly), 0.72 lbs (Cable) |
| Dimensions | 40 x 30 x 20 cm |
| Operating Temp | -40 to +125 deg C (Module), 0 to +60 deg C (Pulse Assembly) |
| Power Consumption | 24 VDC Nominal |
| Input Channels | 16 configurable channels |
| Sampling Rate | Up to 10000 samples/sec |
| Current Rating | 2 A per channel |
| Pulse Input Range | 0.1 Hz to 50 kHz (via FBM242 termination assembly) |
| Input Voltage (Pulse) | -30 VDC to +30 VDC (NPN/PNP, dry contacts) |
| Isolation | Galvanic isolation per channel; opto-isolation to backplane |
| Enclosure Rating | IP65 or higher |
| Communication Protocols | Modbus RTU, Foxboro I/A Series backplane protocol |
The module operates with integrated channel-to-channel isolation to prevent ground loop currents from degrading analog measurement accuracy across the 16 signal paths. When processing low-level analog inputs or interfacing with remote instrumentation, the galvanic isolation barrier maintains signal integrity against high common-mode voltages common in industrial plant environments. Furthermore, the subsystem supports direct integration with specialized FBM242 termination blocks to execute cold junction compensation (CJC) during thermocouple-level temperature monitoring operations, maintaining digital precision through internal reference voltage balancing across the backplane bus.
Q: Can the P0916FH-C cable assembly be hot-swapped while the active P0916FH module is powered?
A: No. Disconnecting the P0916FH-C interface cable during active system operation breaks the electrical loop of all 16 channels simultaneously. This can induce inductive transients and cause the I/A Series controller to instantly register a channel-fail fault. Power down the loop or place the associated control blocks into manual/bypass mode before servicing the cable assembly.
Q: What is the mechanical limitation of the P0916FH-C interface cable route?
A: The P0916FH-C is a Type 4 terminal cable with a rigid 1-meter physical length restriction. It cannot be spliced, extended, or daisy-chained without introducing signal attenuation and degrading the high-speed 10000 samples/sec acquisition performance.
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