Configured for analog signal acquisition in Foxboro I/A Series DCS networks, the Foxboro P0926GQ (P0926GQ Analog Input Modules) provides direct physical/electrical execution. The module processes 16 isolated analog input channels accepting standard 4-20 mA DC transmitter signals across a 12-bit to 16-bit analog-to-digital conversion scale. Operating on a nominal 24 VDC backplane power feed with an 8 W power dissipation profile, the rack-mounted hardware maintains full channel-to-channel and channel-to-system galvanic isolation to suppress common-mode electrical noise across redundant Fieldbus communication paths.
| Parameter | Specification |
|---|---|
| Model | P0926GQ |
| Brand | Foxboro |
| Origin | USA |
| Weight | 0.74 kg (1.63 lbs) |
| Dimensions | 23 cm x 22 cm x 6 cm |
| Operating Temp | 0 deg C to +60 deg C |
| Power Consumption | ~8 W at 24 VDC nominal |
| Product Type | Analog Input Modules |
| Signal Input | 16 channels, 4-20 mA DC range |
| Resolution | 12-bit to 16-bit A/D conversion |
| Galvanic Isolation | Channel-to-channel and channel-to-system isolation |
| System Bus | Foxboro I/A Series redundant Fieldbus |
| Diagnostics | Integrated channel health monitoring, watchdog, and status LEDs |
| Storage Temp | -40 deg C to +85 deg C |
| Operating Humidity | 5% to 95% non-condensing |
The analog input fieldbus module conditions pressure, temperature, flow, and level transmitter telemetry before broadcasting digitized process variables to central control processors. When interfacing field instruments operating over the 4-20 mA HART loop protocol, internal galvanic isolation barriers decouple sensor wiring loops, eliminating ground loops that corrupt signal accuracy. Continuous internal diagnostic routines run in the background to verify A/D conversion linearity, sense wire integrity, and backplane health, illuminating front-panel LEDs to indicate channel faults without interrupting real-time control execution.
Q: How does channel-to-channel galvanic isolation prevent system-wide signal degradation?
A: Optical and transformer barriers isolate each 4-20 mA current loop independently. An electrical short or ground potential shift on one field transmitter remains isolated to that channel, preserving normal operation across the remaining 15 inputs.
Q: Is live insertion and removal supported during active controller operation?
A: Yes, the hot-swappable module incorporates staggered pin connectors on the rear interface, ensuring frame ground and 24 VDC power engage before data communication lines to prevent signal bus interruption during online maintenance.
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