GE Fanuc IC694MDL940 RX3i Relay Output Module

IC694MDL940 GE Fanuc RX3i Relay Output Module

Product Introduction

The IC694MDL940 is a versatile discrete output module designed for the PACSystem RX3i platform from GE Fanuc. This module delivers 16 individually isolated relay outputs for controlling various field devices. These outputs are arranged into four groups, with each group containing four channels that share a common terminal.

Specifically, this module handles both AC and DC loads across a wide voltage range. It works seamlessly with any RX3i CPU and installs into any standard I/O slot within the RX3i backplane. The IC694MDL940 provides reliable switching for motor starters, solenoids, indicators, and other industrial actuators.

Because each output is optically isolated from the backplane, this module offers excellent noise immunity and protection for your control system. Furthermore, its 32 front-panel LEDs give you instant visual feedback on the status of every channel.

Key Technical Specifications

The IC694MDL940 operates with AC voltages from 5 to 250 volts at 47 to 63 Hz, and DC voltages from 5 to 30 volts. Its nominal ratings are 120/240 VAC and 24 VDC. Each normally open (Form A) contact handles a maximum continuous current of 2 amps for pilot duty applications. Additionally, each group of four outputs supports up to 4 amps total across its common terminal.

For switching performance, the module delivers a maximum response time of 15 milliseconds for both turn-on and turn-off transitions. Its minimum load requirement is 10 mA, while the inrush current rating reaches 5 amps per point.

Regarding power consumption, the IC694MDL940 draws 7 mA from the 5V backplane bus when all outputs are energized. It also consumes 135 mA from the 24V relay bus under the same conditions. These figures help you calculate total system power requirements accurately.

Isolation specifications are robust. The module provides 250 VAC continuous isolation between field wiring and the backplane, and 1500 VAC for one minute during testing. Point-to-point isolation between channels is also rated at 250 VAC continuous and 1500 VAC for one minute.

Mechanical and Environmental Parameters

Physically, the IC694MDL940 occupies a single slot in the RX3i backplane. Its compact design allows efficient use of rack space, leaving room for other I/O or specialty modules.

The operating temperature range spans from 0 to 60 degrees Celsius, while storage temperatures may range from -40 to 85 degrees Celsius. Humidity tolerance is 5% to 95% non-condensing, matching typical factory automation environments.

All terminal connections use standard screw-type clamps that accept wire sizes up to 14 AWG. The module's housing provides protection against dust and accidental contact, complying with industrial safety standards.

Installation Guidelines for the IC694MDL940

Installing the IC694MDL940 is straightforward. First, ensure the RX3i system is completely powered down. Then, align the module with the card guides in your chosen I/O slot. Slide it firmly into the backplane until the connectors seat properly. Secure the module using the two retaining screws at the top and bottom.

Next, wire your field devices to the terminal block. Each group has a common terminal, so plan your wiring accordingly. For AC loads, connect the hot side through the relay contact and the neutral directly to the load. For DC loads, observe proper polarity for the external power source.

Because the IC694MDL940 does not include built-in fuses, GE Fanuc recommends installing external fuses on each output channel. This practice protects both the module and your connected devices from overcurrent faults.

Finally, apply power to the backplane and check the LED indicators. Each of the 32 LEDs corresponds to a specific output, showing whether that channel is energized or de-energized.

Output Group Configuration

The IC694MDL940 organizes its 16 outputs into four distinct groups. Each group contains four channels and shares one common return terminal. This grouping simplifies wiring for applications where multiple outputs share the same power source or neutral connection.

For instance, you might connect all four outputs in a group to control different components of a single machine station. Meanwhile, another group could serve a separate station entirely. This flexibility makes the IC694MDL940 suitable for distributed control architectures.

However, remember that each group's total current must not exceed 4 amps. Therefore, if you energize all four outputs simultaneously, each channel must stay well below 1 amp to avoid overloading the common terminal.

Relay Contact Life and Maintenance

The relay contacts inside the IC694MDL940 have a rated operational life ranging from 100,000 to 1,000,000 cycles. The actual lifespan depends heavily on the applied voltage, load type, and switching frequency.

For inductive loads like solenoids or motor starters, contact life tends toward the lower end of this range. Conversely, resistive loads such as heaters or indicator lamps yield longer contact life. To extend service intervals, consider using external suppression devices across inductive loads.

Regular maintenance involves inspecting the front-panel LEDs for abnormal conditions. Additionally, periodically check terminal tightness and look for signs of overheating or discoloration around the wiring.

Packaging and Delivery Information

Each new IC694MDL940 unit arrives in an anti-static protective bag. The package includes the module itself, a removable terminal block connector, and two retaining screws. A quick-start guide is also provided for reference.

The package does not include external fuses, mounting backplanes, or wiring cables. Those items must be sourced separately based on your specific installation needs. No software or configuration utility is supplied with this hardware module.

All orders are insured and shipped via major international couriers. We typically use FedEx, UPS, and DHL to ensure fast and reliable delivery. Most in-stock items dispatch within 24 hours of order confirmation.

Packaging List

• One GE Fanuc IC694MDL940 relay output module

• One removable 20-position terminal block

• Two retaining screws (M3 size)

• One printed quick-start reference card

• Anti-static protective bag

Frequently Asked Questions

1. Can the IC694MDL940 switch 240V AC loads directly?
Yes. The module supports AC voltages up to 250V at 50/60 Hz. Therefore, it can directly control 240V AC devices like contactors and small motors.

2. Do I need external fuses for the IC694MDL940?
Yes, strongly recommended. The module has no internal fuse protection. Installing external fuses on each output channel safeguards both the module and your field wiring from short circuits.

3. What is the difference between the 5V and 24V backplane current draws?
The 5V draw powers the module's logic circuits. The 24V draw energizes the internal relay coils. Both are required for full operation, and both are drawn from the RX3i backplane.

4. Can I mix AC and DC loads on the same group of the IC694MDL940?
No. Each group shares a common terminal. Therefore, all outputs within one group must use the same type of power source—either AC or DC—to avoid cross-phase issues.

5. How do I know if a specific output is stuck or faulty?
Check the corresponding front-panel LED. If the LED is on but the load does not activate, inspect the external wiring and fuse. If the LED is off but the output should be energized, test the module's configuration or replace the unit.