Foxboro P0918AH Analog Input Module | I/A Series DCS

Product Description

The Foxboro P0918AH is a multi-channel analog input module developed for high-efficiency signal acquisition in Foxboro I/A Series Distributed Control Systems. It enables centralized monitoring of multiple field instruments by converting analog process signals into precise digital data for control and analysis.

With support for both current and voltage inputs, the module accommodates a wide range of industrial transmitters. Its high channel density reduces cabinet space requirements while maintaining measurement accuracy and signal integrity. Electrical isolation between channels and system circuits enhances reliability in environments with electrical noise or ground potential differences.

This module is well suited for continuous process industries where stable, high-resolution data acquisition is critical.

Technical Specifications

General Information

• Model: P0918AH

• Manufacturer: Foxboro 

• Product Type: Analog Input Module

• System Compatibility: Foxboro I/A Series DCS

Input Configuration

• Channel Count: 16 single-ended or differential analog inputs

• Supported Input Types:

• Current: 4–20 mA (standard), extended ranges configurable up to ±40 mA (system dependent)

• Voltage: 0–10 V, ±10 V

• Input Impedance: High impedance for voltage inputs, low burden for current loops

Conversion & Accuracy

• Resolution: Typically 16-bit A/D conversion (some legacy configurations may operate at 12-bit)

• Accuracy: ±0.1% of full scale

• Linearity: Maintains consistent performance across full input range

• Conversion Method: Multiplexed analog-to-digital sampling

Performance Characteristics

• Update Time: Approx. 250 ms to reach 99% of final value

• Scan Behavior: Continuous channel scanning for real-time monitoring

• Signal Filtering: Integrated filtering for noise reduction

Isolation & Electrical Protection

• Channel Isolation: Channel-to-channel and channel-to-system isolation

• Isolation Rating: Typically 500 VDC minimum, up to 1500–2000 V (depending on system revision)

• Protection: Designed to withstand transient surges and industrial interference

Power Requirements

• Supply Voltage: 24 VDC

• Power Consumption: Approx. 3.5 W

Environmental Conditions

• Operating Temperature: –40°C to +70°C (extended versions up to +80°C depending on certification)

• Storage Temperature: –40°C to +85°C

• Relative Humidity: 0% to 95% non-condensing

Mechanical Specifications

• Dimensions: 172 mm × 107 mm × 61 mm

• Weight: 0.45 kg

• Installation: Mounts on Foxboro baseplates within DCS cabinets

• Construction: Industrial-grade enclosure for long-term durability

Key Features

• High channel density with 16 analog inputs in a single module

• Supports both voltage and current signal standards

• High-resolution 16-bit conversion for precise measurements

• Strong isolation design improves system reliability

• Fast update performance suitable for process control loops

Applications

• Monitoring of pressure, temperature, and flow transmitters

• Chemical and petrochemical process control

• Power generation instrumentation systems

• Pharmaceutical and batch processing environments

• Centralized data acquisition in large-scale automation systems

FAQ

Q: Can the P0918AH accept both current and voltage signals simultaneously?
A: Yes, individual channels can be configured for different signal types depending on system setup.

Q: What level of accuracy does this module provide?
A: It delivers ±0.1% of full-scale accuracy under standard operating conditions.

Q: Is isolation provided between channels?
A: Yes, the module includes isolation to protect against electrical noise and ground faults, though exact ratings depend on the hardware revision.