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Product Overview

The GE IC694MDR390 Hybrid I/O Module is an industrial PLC I/O component designed to combine input and output functions within a single module. This type of mixed I/O architecture can be useful when a control panel requires both field signal monitoring and discrete device control without dedicating separate rack positions to every signal type.

In an automation system, the I/O module forms the interface between the PLC processor and physical equipment. Inputs allow the controller to monitor field conditions, while outputs allow the control program to command external devices.

The specified dimensions of the GE IC694MDR390 are 145 × 34 × 140 mm, with a specified weight of 0.16 kg.

Because the module directly interfaces with field wiring, correct electrical compatibility, terminal assignment, signal levels, load characteristics, grounding, and wiring practices are particularly important during installation and commissioning.

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Product Identification

Parameter	Specification
Manufacturer	GE
Series	IC694
Model	IC694MDR390
Product Type	Hybrid I/O Module
Main Function	Combined Input and Output Interface
Application	Industrial PLC Automation
Dimensions	145 × 34 × 140 mm
Weight	0.16 kg
Installation	PLC Rack
System Role	Field Signal Interface
Signal Category	Discrete I/O
Typical Applications	Machine Control, Equipment Monitoring, Sequencing

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Technical Specifications

Technical Item	Specification
Manufacturer	GE
Model	IC694MDR390
Product Category	Hybrid I/O Module
Main Function	Combined Digital Input / Output Interface
Dimensions	145 × 34 × 140 mm
Weight	0.16 kg
Installation Environment	Industrial Control Cabinet
System Role	PLC Field Interface
Application	Discrete Machine Control
Input Function	Field-State Monitoring
Output Function	Discrete Device Control
Maintenance	Wiring, Configuration, and Signal Inspection

The exact input count, output count, voltage ranges, current ratings, isolation characteristics, switching behavior, terminal assignments, and load limitations should be verified against the applicable system documentation before wiring the module.

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What Is the IC694MDR390 Used For?

The IC694MDR390 is designed for applications where a PLC needs both input and output functionality in the same rack position.

A simplified control path is:

Field Sensor

↓

IC694MDR390 Input

↓

PLC CPU

↓

Control Logic

↓

IC694MDR390 Output

↓

Actuator

This arrangement can reduce the number of individual modules required for certain machine-control applications.

Typical uses include:

• Machine sequencing
• Equipment monitoring
• Sensor monitoring
• Solenoid control
• Relay-interface applications
• Motor control signals
• Conveyor systems
• Packaging machinery
• General discrete automation

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Hybrid I/O Architecture

A conventional PLC rack may use separate modules:

Input Module

Output Module

A hybrid module combines these functions into one hardware component.

This can be useful where a machine section has a relatively small number of inputs and outputs.

For example:

Field Device	Function
Proximity Sensor	Input
Limit Switch	Input
Pushbutton	Input
Solenoid	Output
Indicator	Output
Relay Command	Output

The exact electrical requirements must be checked before connecting field devices.

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Installation Guide

1. Verify the Module

Confirm the module identification:

GE IC694MDR390

Inspect the module before installation.

Look for:

• Cracked housing
• Damaged terminals
• Bent connectors
• Corrosion
• Contamination
• Physical impact
• Signs of overheating

Do not install a visibly damaged module.

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2. Confirm Rack Compatibility

Before installing the module, verify:

• PLC rack compatibility
• CPU compatibility
• Slot assignment
• Power arrangement
• I/O configuration
• Adjacent module compatibility

A hybrid I/O module must be installed within a compatible PLC architecture.

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3. Check Dimensions

The specified dimensions are:

145 × 34 × 140 mm

Provide enough cabinet space for:

• Module installation
• Field wiring
• Terminal access
• Cable routing
• Ventilation
• Maintenance

Avoid obstructing nearby equipment.

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4. Check Weight

The specified weight is:

0.16 kg

Although the module itself is lightweight, connected field wiring can introduce mechanical stress. Support heavier cables appropriately.

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5. Isolate Power

Before installation or removal:

1. Stop the machine safely.
2. Shut down the PLC system.
3. Isolate applicable electrical power.
4. Apply lockout/tagout procedures.
5. Verify the absence of hazardous voltage.
6. Follow plant electrical-safety procedures.

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6. Install the Module

Align the IC694MDR390 with the assigned rack position.

Insert the module carefully until it is fully seated.

Avoid:

• Excessive force
• Misalignment
• Twisting
• Connector impact
• Contamination

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7. Secure the Module

Verify:

• Proper module seating
• Mechanical retention
• Connector engagement
• Correct alignment
• Adequate clearance

A loose module can cause intermittent I/O operation.

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Field Wiring Preparation

Before connecting field devices, identify every I/O point.

Create a wiring schedule containing:

• Device name
• Input/output designation
• Signal voltage
• Field terminal
• PLC address
• Load information
• Cable identification

This is especially useful for hybrid modules because input and output circuits share the same physical module.

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Input Wiring

Typical input devices can include:

• Pushbuttons
• Limit switches
• Proximity sensors
• Photoelectric sensors
• Pressure switches
• Level switches

Before wiring an input, verify:

• Sensor voltage
• Signal type
• Common/reference arrangement
• Input compatibility
• Polarity where applicable

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Output Wiring

Possible output loads can include:

• Relays
• Contactors through suitable interfaces
• Solenoid valves
• Indicator devices
• Control circuits

Before connecting an output, verify:

• Load voltage
• Load current
• Switching characteristics
• Inductive-load requirements
• Protection requirements

Do not connect a load merely because its nominal voltage appears similar to the system voltage.

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Inductive Loads

Inductive loads such as relays and solenoids can produce transient voltage when switched.

Depending on the circuit design, appropriate suppression may be required.

Possible protective methods can include suitable:

• Flyback suppression
• Surge suppression
• RC networks
• Interface relays

The correct method depends on the load and electrical architecture.

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Wiring Separation

Separate I/O wiring from high-energy conductors where practical.

Avoid routing low-level signal wiring directly alongside:

• Motor power cables
• Variable-frequency drive output cables
• Welding circuits
• High-current power conductors

Good routing practices help reduce electrical interference.

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Commissioning Procedure

Step 1 – Verify Wiring

Before applying power, check:

• Input wiring
• Output wiring
• Common connections
• Terminal tightness
• Cable identification
• Short circuits
• Incorrect cross-connections

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Step 2 – Verify Configuration

Confirm that the PLC program and hardware configuration match the installed IC694MDR390.

Check:

• Slot assignment
• Input addresses
• Output addresses
• Control logic
• Interlocks

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Step 3 – Power Up

Apply power according to the approved commissioning sequence.

Observe the PLC and module status.

Check for abnormal diagnostic indications.

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Step 4 – Test Inputs

Activate each input individually.

For example:

Limit Switch OFF

→ PLC input OFF

Then:

Limit Switch ON

→ PLC input ON

Confirm that the PLC program receives the expected signal.

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Step 5 – Test Outputs

Command each output individually during a controlled test.

Verify:

PLC Output Command

↓

IC694MDR390 Output

↓

Field Device

The field device should respond according to the intended control sequence.

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Step 6 – Test Combined Operation

After individual I/O testing, operate the machine sequence.

Verify:

• Inputs change correctly
• Outputs respond correctly
• Interlocks operate
• Alarms function
• Machine sequencing is correct

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Troubleshooting Guide

Fault 1 – Input Does Not Change State

Possible Causes

• Sensor failure
• Incorrect wiring
• Missing sensor power
• Incorrect signal voltage
• Loose terminal
• Configuration problem
• Input circuit fault

Diagnostic Procedure

Trace the signal:

Sensor → Wiring → IC694MDR390 Input → PLC

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Fault 2 – Input Remains Permanently ON

Possible Causes

• Short circuit
• Incorrect wiring
• Sensor stuck ON
• Electrical interference
• Incorrect common connection
• Input circuit problem

Disconnect the field source only when safe and according to the maintenance procedure, then determine whether the input state changes.

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Fault 3 – Output Does Not Activate

Possible Causes

• PLC logic does not command the output
• Incorrect output address
• Wiring problem
• Missing load power
• Load failure
• Output circuit problem

Trace:

PLC Logic → Output Address → IC694MDR390 → Field Wiring → Load

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Fault 4 – Output Command Is Present but Load Does Not Operate

Possible causes include:

• Open field circuit
• Missing external power
• Damaged load
• Incorrect wiring
• Loose terminal
• Inadequate load interface

The presence of a PLC output command does not necessarily mean that the external load is receiving the expected electrical power.

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Fault 5 – Output Remains ON

Possible Causes

• PLC program continuously commands output
• Incorrect interlock
• Wiring short
• Output circuit fault
• External circuit problem

First determine whether the PLC is actually commanding the output.

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Fault 6 – Multiple Inputs Fail

If several inputs fail simultaneously, investigate common causes:

• Sensor power
• Common wiring
• Rack power
• Configuration
• Connector
• Module hardware

Multiple simultaneous failures are often more likely to involve shared infrastructure than independent sensor failures.

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Fault 7 – Multiple Outputs Fail

Possible causes include:

• Common load power failure
• Wiring problem
• Configuration issue
• Module fault
• PLC program problem

Check whether the affected outputs share a common electrical path.

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Fault 8 – Inputs Work but Outputs Do Not

This condition can help narrow the fault.

Investigate:

• Output configuration
• Output power
• Load wiring
• Load condition
• Output circuit

The CPU and input side may still be operating correctly.

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Fault 9 – Outputs Work but Inputs Do Not

Investigate:

• Sensor power
• Input wiring
• Input common
• Sensor compatibility
• Input configuration

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Fault 10 – Intermittent I/O Operation

Possible Causes

• Loose terminals
• Vibration
• Cable damage
• Electrical interference
• Poor grounding
• Temperature-related connection problems

Inspect both the module and the connected field wiring.

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Fault Diagnosis Flow

Use the following sequence:

Field Device

↓

Field Wiring

↓

IC694MDR390

↓

PLC Rack

↓

CPU

↓

PLC Program

↓

Actuator

This helps determine whether the fault is in the field device, wiring, I/O module, rack, controller, or application logic.

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Preventive Maintenance

Module Inspection

Inspect the IC694MDR390 for:

• Physical damage
• Connector condition
• Contamination
• Corrosion
• Heat discoloration
• Secure seating

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Terminal Inspection

Check field terminals for:

• Loose connections
• Corrosion
• Damaged conductors
• Poor crimping
• Insulation damage

Loose terminals are a common source of intermittent I/O faults.

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Sensor Maintenance

Periodically inspect connected sensors for:

• Mechanical damage
• Contamination
• Incorrect alignment
• Cable deterioration
• Unstable operation

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Output Load Inspection

Check connected output devices for:

• Coil damage
• Overheating
• Mechanical sticking
• Excessive current
• Wiring problems

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Cabinet Maintenance

Maintain:

• Clean air
• Appropriate temperature
• Adequate ventilation
• Low humidity
• Low vibration

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Preventive Maintenance Table

Maintenance Area	Recommended Action
Module Housing	Inspect for physical damage
Module Seating	Verify secure installation
Terminals	Check tightness and condition
Input Sensors	Check operation and alignment
Output Loads	Inspect electrical and mechanical condition
Wiring	Check insulation and routing
Cabinet	Keep clean and dry
Grounding	Verify according to system design
PLC Configuration	Confirm I/O assignments
Diagnostics	Review abnormal conditions

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Industrial Applications

Machine Automation

The IC694MDR390 can be used where a machine requires both sensor inputs and discrete outputs.

A typical sequence could be:

Part Detected

↓

PLC Processes Input

↓

Machine Sequence

↓

Solenoid Activated

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Conveyor Systems

Hybrid I/O can be useful in conveyor sections containing both:

• Product-detection sensors
• Motor or actuator control signals

This can simplify the rack configuration for smaller machine zones.

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Packaging Equipment

Packaging machines frequently contain numerous discrete signals.

Examples include:

• Product sensors
• Limit switches
• Door switches
• Solenoid valves
• Control relays

A combined I/O module can provide a compact interface for suitable applications.

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Material Handling

Material-handling systems may require simultaneous monitoring and control of:

• Position sensors
• Proximity switches
• Pneumatic valves
• Conveyors
• Machine interlocks

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Machine Sequencing

A hybrid I/O module can participate in sequences such as:

Sensor Detection

→

CPU Logic

→

Output Command

→

Actuator

→

Next Sensor Event

This creates a closed-loop discrete control sequence.

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Hybrid I/O vs. Separate I/O Modules

Feature	Hybrid I/O Module	Separate I/O Modules
Inputs and Outputs	Combined	Separate
Rack Space	Potentially Reduced	More Positions Required
Wiring	Mixed on One Module	Grouped by Function
Small Machine Sections	Suitable	May Be More Hardware Than Needed
Large Systems	Application Dependent	Easier Functional Separation
Maintenance	Mixed I/O Diagnostics	Function-Specific Modules

A hybrid module is particularly attractive when the machine section has a modest combination of inputs and outputs.

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System Integration

A typical PLC architecture is:

Field Sensors

↓

IC694MDR390

↔

PLC CPU

↓

IC694MDR390 Outputs

↓

Actuators

The CPU executes the control program while the hybrid I/O module provides the electrical interface to field equipment.

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Replacement Procedure

1. Document Existing Wiring

Before removal, record:

• Module position
• Terminal assignments
• Input addresses
• Output addresses
• Connected devices
• Common connections

Photographs and wiring labels can help prevent reconnection errors.

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2. Back Up PLC Configuration

Save:

• PLC program
• Hardware configuration
• I/O mapping
• Relevant machine parameters

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3. Isolate Power

Stop the machine and isolate applicable electrical power.

Follow lockout/tagout requirements.

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4. Disconnect Field Wiring

Label all field wires before removing them.

Keep input and output wiring clearly identified.

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5. Remove the Existing Module

Release the module’s retaining mechanism and carefully remove it from the rack.

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6. Inspect the Rack Connection

Check the rack connector for:

• Bent contacts
• Contamination
• Damage
• Corrosion

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7. Install the Replacement

Install the replacement module in the correct position.

Verify complete seating.

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8. Reconnect Wiring

Reconnect each conductor according to the documented terminal assignment.

Double-check every input and output before applying power.

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9. Test Inputs and Outputs

Test each circuit individually.

Confirm:

• Input state
• Output command
• Field response
• PLC address
• Machine sequence

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Replacement Considerations

Parameter	Specification / Check
Manufacturer	GE
Model	IC694MDR390
Product Type	Hybrid I/O Module
Dimensions	145 × 34 × 140 mm
Weight	0.16 kg
Rack Compatibility	Confirm
Input Configuration	Confirm
Output Configuration	Confirm
Voltage Requirements	Confirm
Current Ratings	Confirm
Terminal Assignment	Confirm
PLC Configuration	Confirm

The correct replacement must match the electrical characteristics and system configuration, not merely the physical dimensions.

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Key Advantages

• Combines input and output functionality
• Provides a compact PLC I/O solution
• Reduces the need for separate I/O modules in suitable applications
• Supports machine-control architectures
• Provides direct field-device interfacing
• Suitable for discrete automation
• Useful for equipment monitoring and control
• Compact module format
• Dimensions: 145 × 34 × 140 mm
• Weight: 0.16 kg

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Technical FAQs

What is the GE IC694MDR390?

The GE IC694MDR390 is identified as a hybrid I/O module designed to combine input and output functions within a compatible PLC system.

What are the dimensions of the IC694MDR390?

The specified dimensions are 145 × 34 × 140 mm.

What is the weight of the IC694MDR390?

The specified weight is 0.16 kg.

What is a hybrid I/O module?

A hybrid I/O module combines input and output functions in one module, allowing the PLC to monitor field signals and control external devices using a shared module position.

What devices can be connected to the input side?

Depending on the supported electrical characteristics, applications can include switches, proximity sensors, photoelectric sensors, limit switches, and other discrete field devices.

What devices can be connected to the output side?

Suitable applications may include relays, solenoids, indicators, and other compatible discrete loads. Load voltage and current must be verified before connection.

Why does an input fail to change state?

Check the sensor, sensor power, wiring, terminal connection, signal compatibility, module configuration, and input circuit.

Why does an output command not operate the actuator?

Check PLC logic, output addressing, field power, wiring, load condition, and output-circuit compatibility.

Why do several inputs fail at the same time?

A shared sensor supply, common wiring, module connection, rack problem, or configuration issue may affect multiple inputs simultaneously.

Why do several outputs fail at the same time?

Check common output power, wiring, PLC logic, configuration, and module condition.

Why are hybrid I/O modules useful?

They can reduce rack-space requirements when a machine section needs a combination of inputs and outputs.

What should be checked before replacing the module?

Verify the module model, rack compatibility, I/O configuration, electrical characteristics, terminal assignments, field wiring, and PLC configuration.

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Conclusion

The GE IC694MDR390 Hybrid I/O Module provides a compact interface between a compatible PLC system and discrete field devices. By combining input and output functions in one module, it can be useful for machine sections that require both monitoring and control while maintaining an efficient rack configuration.

The specified dimensions are 145 × 34 × 140 mm, and the specified weight is 0.16 kg.

Installation should begin with confirmation of rack compatibility and electrical requirements. Field wiring should then be carefully identified, separated where appropriate, and checked for correct voltage, polarity, common connections, and load characteristics. During commissioning, inputs and outputs should be tested individually before the complete machine sequence is operated.

For troubleshooting, the most effective method is to follow the actual signal path from field device → wiring → IC694MDR390 → PLC CPU → control logic → output circuit → actuator. This makes it easier to distinguish sensor faults, wiring problems, configuration errors, module faults, and field-load problems.

Regular inspection of the module, terminals, sensors, output devices, wiring, and cabinet environment can help maintain reliable I/O operation and reduce unexpected downtime in industrial automation systems.