GE Fanuc IC670MDL331D 120VAC 2A Isolated Output Module

Description

Key Technical Specifications

• Manufacturer: GE Fanuc Automation
• Part Number: IC670MDL331D
• Product Family: Field Control I/O System
• Module Type: Isolated Discrete Output Module
• Output Points: 8 points
• Output Arrangement: Four isolated groups, 2 outputs per group
• Rated Output Voltage: 120 VAC nominal
• Operating Voltage Range: 85 to 132 VAC
• Frequency Range: 47 to 63 Hz
• Maximum Output Current: 2 A per point
• Maximum Module Current: Approximately 6 to 8 A depending on temperature/load distribution
• Backplane Current Consumption: 154 mA from Bus Interface Unit supply
• Output Isolation: Group-to-group isolation
• Status Indicators: Individual output LEDs and fuse status LEDs
• Protection: Internal fuse protection and snubber circuits
• Communication Interface: Field Control Bus Interface Unit

The GE Fanuc IC670MDL331D is part of the Field Control distributed I/O family and provides eight isolated 120 VAC discrete outputs. Each output group contains two points, with groups electrically isolated from each other for industrial load separation.

Product Introduction

The GE Fanuc IC670MDL331D is a Field Control discrete output module designed for controlling 120 VAC industrial loads through a distributed I/O architecture. It provides eight isolated output points arranged in four groups of two channels and connects to the control system through a Field Control Bus Interface Unit.

This module is commonly installed in legacy GE Fanuc Field Control systems controlling solenoids, contactors, motor starters, and other AC field devices. The isolated output design helps separate load groups while maintaining centralized PLC control.

IC670MDL331D

IC670MDL331D

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation (Approx. 10 minutes)

⚠️ Safety First

• Notify operations before removing the existing output module.
• Place connected equipment into a safe state.
• Apply lockout/tagout procedures.
• Verify AC field power is disconnected.
• Wait for stored electrical energy to discharge.

Tools Required

• ESD wrist strap
• PH1 screwdriver
• Digital multimeter
• Wire labels
• Smartphone/camera for wiring documentation

Data Backup

Before removal:

1. Record Field Control station location.
2. Photograph terminal wiring.
3. Document output assignments.
4. Record Bus Interface Unit configuration.
5. Confirm load voltage requirements.

Stage 2: Removing the Old Module (Approx. 10 minutes)

Steps:

1. Remove the module cover if installed.
2. Label each AC output wire.
3. Verify voltage absence with a multimeter.
4. Disconnect field wiring carefully.
5. Release module mounting hardware.
6. Remove the module straight from the terminal base.

⚠️ Note:
Keep the removed IC670MDL331D available until the replacement passes output testing.

Stage 3: Installing the New Module (Approx. 15 minutes)

Steps:

1. Wear an ESD wrist strap.
2. Verify the replacement part number: IC670MDL331D.
3. Install the module into the correct Field Control base.
4. Reconnect output wiring according to the original documentation.
5. Verify group isolation wiring.
6. Tighten terminals using appropriate torque.

Configuration Clone Checklist

• Module position matches original
• Output channel assignments verified
• AC voltage rating confirmed
• Group wiring checked
• Field load current verified

Stage 4: Power-On & Testing (Approx. 20 minutes)

Pre-Power Check

• Confirm no output wiring shorts.
• Verify correct AC supply voltage.
• Check fuse condition.

Power-On Steps

1. Energize the Field Control station.
2. Confirm module status indicators.
3. Verify communication through the Bus Interface Unit.
4. Command each output channel from the PLC.
5. Measure output voltage at each active channel.
6. Confirm field devices operate correctly.

⚠️ Troubleshooting Note

If an output does not energize:

• Check the group fuse indicator.
• Verify AC supply wiring.
• Confirm PLC output command status.
• Check field device current requirements.
• Inspect terminal connections.

Frequently Asked Questions (FAQ)

Q1: Is the GE Fanuc IC670MDL331D obsolete?

Yes. The is part of the legacy GE Fanuc Field Control product family. Plants maintaining older automation systems typically source this module through new surplus, tested used, or refurbished inventory channels.

Q2: How many outputs does the provide?

The module provides eight discrete AC outputs arranged as four isolated groups, with two output points per group.

Q3: Can the directly replace IC670MDL331?

The electrical function is generally the same Field Control 120 VAC isolated output type, but verify the exact suffix, hardware revision, terminal base compatibility, and configuration before installation.

Q4: Can this module be hot-swapped?

No. Do not remove or install the under power unless the complete Field Control hardware documentation confirms that specific procedure. Disconnect power before handling field wiring.

Q5: What loads can the control?

Typical applications include AC solenoids, contactors, motor starters, indicator devices, and other 120 VAC industrial loads within the module current rating. Verify inrush current before connecting inductive loads.

Q6: Why do plants still purchase modules?

Many facilities continue operating GE Fanuc Field Control systems because replacing distributed I/O requires hardware changes, software updates, wiring modifications, and production downtime. Maintaining tested spare modules can reduce outage duration.

Q7: What should be verified before ordering ?

Confirm:

• Exact part number:
• System family: GE Fanuc Field Control
• Output type: 120 VAC isolated output
• Channel count: 8 points
• Load current requirements
• Required condition: New Original, New Surplus, or Tested Refurbished

For legacy Field Control replacements, matching electrical configuration matters more than the physical appearance of the module.