Product Overview

The GE Fanuc IC693MDL940J Relay Output Module is a discrete output module designed for the Series 90-30 programmable logic controller (PLC) platform. It enables a PLC to control external electrical devices through relay contacts, making it suitable for industrial automation systems that require reliable switching of AC or DC loads.

Manufactured originally under the GE Fanuc automation product line, the IC693MDL940J is designed to interface PLC output logic with field devices such as contactors, solenoids, indicator lamps, and auxiliary relays. The module receives output commands from the PLC system and changes the state of its relay contacts according to the controller’s logic.

The module provides 16 normally open relay output points arranged in four groups of four outputs. Each output supports a maximum pilot-duty load of 2 A, while each common terminal supports a maximum current of 4 A. The field devices connected to the module require their own suitable AC or DC power supply; the module’s backplane power is used for its internal relay circuitry.

The IC693MDL940J is intended for applications where relay-based switching is appropriate. Compared with transistor-based outputs, relay contacts can accommodate specified AC and DC loads, but their mechanical switching characteristics make them less suitable for applications requiring extremely frequent switching or very high switching speeds.

For maintenance and replacement projects, verifying the complete model number, output arrangement, load requirements, and compatibility with the installed Series 90-30 PLC system is essential.

Technical Specifications

Technical note: Output ratings depend on the load type and applicable operating conditions. Confirm the manufacturer’s electrical specifications and the actual module revision before designing or modifying a field circuit.

Function and Working Principle

The IC693MDL940J acts as the output interface between the PLC’s control logic and external electrical loads. When the PLC determines that an output should be activated, it sends the corresponding output command through the backplane. The module energizes the relevant relay circuit, causing the normally open contact to close.

When the output command is removed, the relay returns to its normal state and the contact opens. This switching action allows the PLC to control external equipment without directly carrying the field load current through the controller’s logic circuitry.

1. Relay-Based Output Switching

Each of the 16 output points uses a normally open relay contact. In its normal state, the contact is open. When activated, it closes to complete the connected field circuit.

This arrangement is useful for switching compatible loads that require an electrically controlled contact. Examples include control relays, indicator devices, solenoids, and contactor coils.

The connected load must remain within the module’s rated voltage and current limits. Inductive loads may generate voltage transients when switched, so appropriate suppression and protection should be considered according to the load and manufacturer’s guidance.

2. Four-Group Output Organization

The 16 output points are divided into four groups, each containing four outputs. Every group has a common terminal.

This organization allows engineers to arrange field circuits in logical groups, simplify wiring, and identify the relationship between PLC output addresses and connected equipment.

Each common terminal has a maximum current rating of 4 A. Even though an individual output can support up to 2 A under the specified pilot-duty conditions, the total current through a common terminal must remain within its limit.

3. AC and DC Load Switching

The module supports specified AC and DC operating voltages. This makes it useful for different types of industrial control circuits, provided the selected voltage, load current, and load characteristics are compatible with the relay ratings.

The field power supply is provided by the user. The module’s backplane supplies the internal relay circuitry, while the external circuit supplies the electrical power required by the connected field device.

4. Output Status Indication

Individual LED indicators show the ON/OFF status of the output points. These indicators help maintenance personnel identify which outputs the PLC is commanding during commissioning and troubleshooting.

An illuminated indicator should not be treated as proof that the field device is operating correctly. If an output LED is on but the connected load does not respond, possible causes include an open field circuit, a failed load, an incorrect supply voltage, damaged wiring, or a relay contact problem.

5. Electrical Isolation

The module provides isolation between the field side and the logic side, as well as isolation between output groups according to its published specifications.

Isolation helps separate the PLC logic circuitry from external field circuits. However, it does not eliminate the need for correct grounding, overcurrent protection, wiring practices, or compliance with electrical safety requirements.

Role in Industrial Control Systems

The GE Fanuc IC693MDL940J provides the physical output interface needed to convert PLC decisions into switching actions in industrial equipment.

PLC-Controlled Equipment

In a Series 90-30 system, the PLC executes a control program based on inputs, timers, internal logic, and process conditions. The IC693MDL940J receives output commands and operates the corresponding relay contacts.

For example, a PLC may activate an output when a sensor detects that a product has reached a particular position. The output relay can then switch a compatible control circuit to operate a solenoid or contactor.

Machine Sequence Control

The module can support sequential machine operations in which several devices must be activated at different stages of a process. The 16 output points allow a single module to control multiple discrete loads, subject to the current limits and the system’s output-address configuration.

Typical controlled devices include machine indicators, auxiliary relays, pneumatic valve solenoids, and motor-starter control circuits.

Alarm and Status Circuits

Relay outputs can be used to operate external indicators or auxiliary alarm circuits. A PLC may activate an output when a process variable exceeds a configured limit or when an abnormal machine condition is detected.

The complete alarm function depends on the PLC program, the connected field device, and the electrical circuit. The relay output module itself does not determine the meaning of the alarm.

Integration with Existing PLC Systems

The IC693MDL940J is designed for Series 90-30 installations. During replacement or system maintenance, engineers should verify the module’s hardware revision, rack compatibility, output addressing, wiring connections, and load requirements.

It should not be assumed that a similarly sized module from another PLC family will be a direct substitute.

Industrial Applications

The IC693MDL940J is suitable for industrial control applications requiring discrete relay outputs for compatible field devices.

1. Manufacturing Automation

Manufacturing systems often use relay outputs to operate auxiliary equipment, indicator lamps, small control relays, and machine interlocks.

The module can execute switching commands generated by the PLC’s production sequence. Its 16 output points allow several devices to be controlled from a single module, provided the electrical ratings are respected.

2. Conveyor and Material-Handling Systems

Conveyor systems use discrete outputs to control contactors, warning indicators, and auxiliary equipment. A PLC can use output commands to coordinate the start and stop sequence of a conveyor line.

For motor power switching, the module should generally operate an appropriately rated control circuit rather than directly switch a motor load unless the specific load and switching duty are explicitly permitted by the manufacturer’s ratings.

3. Packaging Machinery

Packaging equipment may use solenoids, contactors, signal lamps, and auxiliary relays to perform operations such as feeding, sealing, sorting, and product transfer.

The IC693MDL940J can provide the relay switching interface for compatible devices. The PLC program determines when each output is activated as part of the machine cycle.

4. Pump and Valve Control

Industrial pump and fluid-handling systems often include electrically controlled valves, contactors, and auxiliary devices.

The module can switch suitable valve solenoids or control relays when the PLC receives the required process conditions. Engineers must verify the coil voltage, inrush current, steady-state current, and any necessary suppression components.

5. Building and Utility Control

Some industrial utility systems require discrete control of indicators, auxiliary relays, and other low-current field devices. Relay outputs may be used to implement these functions where the voltage and load characteristics are within specification.

For applications involving critical protection, emergency shutdown, or safety-rated functions, the module must not be assumed to provide a certified safety function. Use the appropriate safety architecture and approved components for the application.

Installation and System Integration

Proper installation is necessary to maintain reliable output switching and protect the PLC system from wiring errors and electrical faults.

1. Verify PLC Compatibility

Before installation, confirm that the IC693MDL940J is compatible with the installed Series 90-30 baseplate and system configuration.

Check the complete catalog number and hardware revision. Do not rely solely on appearance, because modules with similar dimensions may have different electrical functions or terminal arrangements.

2. Check Field Voltage and Load Current

Confirm the voltage and current requirements of every connected device. The module supports 5–30 V DC and 5–250 V AC under its specified operating conditions, but each output and common terminal must remain within its rated current limits.

For loads with high inrush current, verify that the switching characteristics are suitable. Contactors, solenoids, and other inductive devices may require suppression components to reduce switching transients and improve contact life.

3. Organize Group Commons

The 16 output points are divided into four groups of four. Identify the common terminal for each group and wire the field circuits accordingly.

The maximum current per common terminal is 4 A. Calculate the combined load for each group rather than checking only the current drawn by individual outputs.

4. Provide External Field Power

The module’s backplane provides power for its internal relay circuitry. The user must supply the appropriate AC or DC power for the external field devices.

Verify the field supply voltage, polarity where applicable, protective devices, conductor ratings, and circuit isolation before energizing the system.

5. Confirm Wiring and Terminal Connections

Follow the correct terminal diagram for the specific module and baseplate arrangement. Label field wires and ensure that each output address corresponds to the intended field device.

Use appropriate overcurrent protection and follow applicable electrical codes. Avoid making wiring changes while the system is energized.

6. Observe the No-Hot-Swap Requirement

The IC693MDL940J is not intended for hot insertion or removal. Do not insert or remove the module while the backplane is energized.

Before replacing the module, shut down the relevant system according to the site’s procedures, isolate hazardous energy, and verify that it is safe to proceed. Follow the manufacturer’s installation instructions when restoring the system to service.

7. Test Outputs During Commissioning

After installation, verify the output LEDs, relay switching, field supply, and operation of each connected device.

Test the system under controlled conditions. Confirm that outputs activate in response to the intended PLC logic and that the connected loads return to their expected state when the output command is removed.

Compatible System Components

The IC693MDL940J operates as part of a PLC-based control system. The following components may be used in a typical installation, depending on the application design.

These are examples of system components, not a statement that they are included with the IC693MDL940J.

Alternative Models and Replacement Considerations

When replacing a relay output module in a legacy PLC system, compare the electrical specifications, output count, contact type, group arrangement, and platform compatibility.

A related model is not necessarily a direct replacement. Before substitution, compare the complete catalog number, PLC platform, output current limits, voltage range, group commons, wiring terminal arrangement, and PLC configuration.

For legacy systems, maintaining the original module may be the least disruptive option when a suitable replacement is available. If the module is changed to a different model, the system may require wiring modifications, configuration updates, and additional commissioning.

Key Advantages

16 Relay Output Points

The module provides 16 normally open relay outputs, allowing the PLC to control multiple discrete field devices through a single output module.

AC and DC Load Compatibility

The specified operating ranges support compatible AC and DC field circuits, giving engineers flexibility when designing control panels.

Organized Output Groups

Four groups of four outputs provide a clear structure for field wiring and load distribution. The common-terminal current limit must still be observed.

Individual Status LEDs

Output indicators assist commissioning personnel in identifying commanded output states and diagnosing field-control problems.

Electrical Isolation

Published isolation ratings help separate field-side circuits from the PLC logic side and between output groups, subject to the manufacturer’s installation requirements.

Integration with Series 90-30 Systems

The module is designed for use in GE Fanuc Series 90-30 PLC installations, making it relevant to maintenance and spare-parts requirements for existing systems.

Technical FAQs

1. What is the GE Fanuc IC693MDL940J?

It is a 16-point normally open relay output module designed for the GE Fanuc Series 90-30 PLC platform.

2. How many output points does it provide?

The module provides 16 relay output points arranged in four groups of four.

3. What is the maximum current per output?

The published maximum is 2 A per output for pilot-duty loads. The maximum current per common terminal is 4 A. Actual permissible loading depends on the applicable load and operating conditions.

4. Can it switch AC and DC loads?

Yes. Its specified operating range is 5–30 V DC or 5–250 V AC at 50/60 Hz. The load’s current, inrush, and switching characteristics must also be compatible.

5. Does the module supply power to connected field devices?

No. The backplane provides power for the module’s internal relay circuitry. The user must supply the appropriate AC or DC field power for the connected devices.

6. What do the LED indicators show?

Individual LEDs indicate the ON/OFF status of the output points. They help identify commanded output states but do not independently confirm that the field device is functioning.

7. Does the IC693MDL940J have internal fuses?

No. The module does not provide internal output fuses. Appropriate external circuit protection must be selected for the field wiring and loads.

8. Can it be removed while the PLC is powered?

No. The IC693MDL940J is not compatible with hot-swap operations. Follow the proper shutdown and isolation procedures before removing or installing the module.

9. What should be checked before ordering a replacement?

Confirm the full catalog number and revision, output type, point count, current ratings, group arrangement, terminal layout, and compatibility with the installed PLC platform.

10. What is the listed weight?

The supplied product listing specifies 0.23 kg. Verify the physical unit and packaging weight separately if the information is being used for shipping or logistics.

Procurement and Maintenance Recommendations

The GE Fanuc IC693MDL940J is a legacy PLC output module, so accurate model identification is particularly important when purchasing replacement stock.

Before ordering, verify the complete catalog number, module revision, physical condition, terminal condition, and compatibility with the installed Series 90-30 PLC system. For used or refurbished modules, request clear photographs and available functional test information.

During maintenance, inspect the wiring, terminal connections, field supply, and output response. If an output fails to operate a load, check the PLC command, module status LED, external field supply, wiring continuity, load condition, and relay contact performance.

Relay contacts are electromechanical components and can wear over time, particularly under frequent switching or demanding inductive loads. Where switching reliability deteriorates, investigate the actual load characteristics and consider whether the module remains appropriate for the application.

Keep an updated record of output addresses, connected field devices, group commons, and wiring changes. This information helps reduce troubleshooting time and makes future module replacement more straightforward.

Conclusion

The GE Fanuc IC693MDL940J Relay Output Module is a 16-point discrete output device designed for Series 90-30 PLC systems. Its normally open relay contacts support compatible AC and DC field loads, with a maximum pilot-duty rating of 2 A per output and 4 A per common terminal.

With grouped output wiring and individual status indicators, the module can support a range of industrial switching and machine-control tasks. Correct voltage selection, load protection, field wiring, and PLC compatibility checks are essential for dependable operation.

For legacy equipment maintenance, verifying the complete model number and following the manufacturer’s installation requirements—including the prohibition on hot insertion or removal—helps reduce the risk of equipment damage and unplanned downtime.