GE Fanuc Field Control IC670MDL930 16-Point Relay Output Module

Product Overview

The IC670MDL930 (IC670-MDL-930) is a high-performance 16-point relay output module from the GE Fanuc Field Control I/O series. It is designed to interface high-power field devices—such as large motor starters, heavy-duty solenoids, and industrial alarms—with a centralized control system. Unlike transistor-based outputs, the IC670MDL930 provides dry contact switching, allowing for the control of both AC and DC loads with significant current demands. This module is an essential component for distributed I/O architectures where electrical isolation and the ability to switch diverse voltage levels across different channels are required. Its rugged construction ensures reliable performance in harsh industrial environments like steel mills, power plants, and chemical processing facilities.

Technical Configuration

The module features 16 independent "Form A" (Normally Open) relay contacts. These outputs are divided into two isolated groups of eight, allowing each group to handle a different voltage source if necessary. The IC670MDL930 is a "Smart" module that plugs into a Field Control terminal base (such as the IC670CHS001 or CHS002), facilitating hot-swappable maintenance. It includes internal arc suppression to extend contact life and provides individual LED indicators for each of the 16 channels, allowing for rapid visual diagnostics of the output states.

Technical Specifications

Technical FAQs

What is the primary advantage of using a relay module like the IC670MDL930 over a transistor module?

Relay modules provide "dry contacts," meaning they can switch both AC and DC voltages and are not polarity-sensitive. They also offer much higher current-carrying capacity (2 Amps) and complete galvanic isolation between the PLC logic and the high-voltage field power.

Can I mix AC and DC loads on this module?

Yes, but with a restriction: you can mix them as long as they are in different groups. Since there are two isolated groups of eight, you could run 120 VAC on the first group and 24 VDC on the second group. However, all eight points within a single group must share the same common voltage source.

What should I do if my load is very small (less than 10 mA)?

Relay contacts require a "wetting current" to keep the contacts clean of oxidation. If your load is under 10 mA, the contact may become unreliable over time. In such cases, adding a "bleeder resistor" in parallel with the load can help maintain the minimum required current.

Engineering & Installation Guide

• Arc Suppression: When switching inductive loads (solenoids, contactor coils), the resulting back-EMF can cause arcing that prematurely wears out the relay contacts. Always install an RC snubber for AC loads or a flyback diode for DC loads across the field device to suppress these spikes.

• Fusing Recommendations: While the module is robust, it does not have internal user-replaceable fuses. To protect the IC670MDL930 from field-side short circuits, it is an engineering best practice to install external 2-Amp fast-acting fuses for each output point or an 8-Amp fuse for each group.

• Thermal Management: When switching 2 Amps across all 16 points simultaneously, the module will generate internal heat. Ensure the Field Control rack has adequate airflow, and avoid mounting the module directly above heat-producing components like power supplies or VFDs.