Foxboro N-2AX+DIO - I/A Series Network Interface Module with 2 Analog Inputs and Digital I/O

Foxboro N-2AX+DIO – I/A Series Network Interface Module with 2 Analog Inputs and Digital I/O

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Product Introduction:
The Foxboro N-2AX+DIO is a compact network interface module for the Foxboro I/A Series Distributed Control System. The “N” denotes Network, “2AX” indicates 2 analog inputs (A) with extended (X) capabilities, and “+DIO” adds digital input/output capability to the same module. This module provides a small amount of local I/O (2 analog inputs and several digital I/O points) along with Ethernet or serial network connectivity, making it ideal for remote I/O stations or small control loops where a full-size I/O module is unnecessary. It connects to the main I/A Series controller via Ethernet or serial link, extending the control system to remote locations without running expensive I/O cables back to the main control room.

Technical Specifications:
Board Type: Network Interface Module with Local I/O
System: Foxboro I/A Series (Series 400)
Analog Inputs: 2 independent channels (4-20mA or 0-10V)
Digital I/O: 8 digital points (configurable as 4 DI + 4 DO, or 8 DI, or 8 DO)
Network Interface: 10/100Base-T Ethernet (RJ-45) + 1 RS-485 serial
Resolution: 16-bit A/D conversion
Accuracy: +/- 0.1% of full scale
Update Rate: 250 milliseconds
Isolation: 1500V RMS channel-to-channel
Power: 24V DC from I/A backplane or local power supply
Form Factor: 3U I/A Series Eurocard
Operating Temperature: 0 to 60 degrees Celsius

Functional Features:
Local I/O: Provides 2 analog inputs and 8 digital I/O points locally, eliminating the need for separate I/O modules at remote locations.
Ethernet Connectivity: Connects to the main I/A Series controller via standard Ethernet, simplifying cabling.
Serial Backup: RS-485 serial port provides a backup communication path if Ethernet fails.
Compact Size: Small 3U form factor saves space in remote I/O cabinets.
Per-Channel Configuration: Each I/O point independently configurable for type, range, and fail-safe state.
LED Indicators: Per-channel LEDs show I/O status and network activity.
Watchdog Timer: Hardware watchdog detects communication loss and forces safe I/O state.

Application Scenarios:
Remote I/O Stations: Extends the I/A Series controller to remote pump stations, tank farms, and field equipment.
Small Control Loops: Provides local I/O for small loops (like a single pump or valve) without occupying a full I/O slot in the main chassis.
Retrofit Projects: Adds I/O and network connectivity to older systems that lack Ethernet capability.
Temporary Installations: Used for temporary monitoring points during construction or commissioning.

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