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- IC695ALG112
- RX3i Analog Input Module
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- 145 x 34 x 140 mm
- 0.45 kg
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Product Overview
The GE IC695ALG112 RX3i Analog Input Module is an industrial analog input module designed for integration into compatible GE RX3i PLC control systems. It provides the interface between analog field signals and the PLC control architecture, allowing process variables to be acquired and used by the controller for monitoring, control, alarming, and data processing.
Analog input modules are commonly used when industrial equipment produces continuously varying signals rather than simple ON/OFF states. Depending on the configured application, analog signals may represent process values such as temperature, pressure, flow, level, speed, or other instrumentation measurements.
The specified dimensions of the GE IC695ALG112 are 145 × 34 × 140 mm, with a specified weight of 0.45 kg.
For reliable operation, installation should consider signal wiring, grounding, shielding, channel configuration, electrical noise, module seating, and the relationship between the field transmitter and the PLC scaling configuration.
Product Identification
| Parameter | Specification |
|---|---|
| Manufacturer | GE |
| Product Family | RX3i |
| Model | IC695ALG112 |
| Product Type | RX3i Analog Input Module |
| Main Function | Analog Signal Acquisition |
| Application | Industrial PLC / Process Automation |
| Dimensions | 145 × 34 × 140 mm |
| Weight | 0.45 kg |
| Installation | RX3i PLC System |
| Signal Type | Analog Input |
| System Role | Field Signal Interface |
| Maintenance Focus | Signal Quality, Wiring, Configuration |
Technical Specifications
| Technical Item | Specification |
|---|---|
| Manufacturer | GE |
| Series | RX3i |
| Model | IC695ALG112 |
| Product Category | Analog Input Module |
| Primary Function | Analog Signal Acquisition |
| Dimensions | 145 × 34 × 140 mm |
| Weight | 0.45 kg |
| Application | Industrial Automation |
| Installation Environment | Control Cabinet |
| System Integration | RX3i PLC Architecture |
| Signal Processing | Analog Input Acquisition |
| Configuration | Dependent on System Application |
| Maintenance | Wiring, Configuration and Diagnostics |
The exact channel count, input signal ranges, electrical isolation, resolution, conversion characteristics, terminal arrangement, and supported signal types should be confirmed against the applicable system documentation before commissioning.
What Is the GE IC695ALG112?
The IC695ALG112 is an RX3i Analog Input Module.
Its role is to receive analog information from field instrumentation and make that information available to the RX3i control system.
A typical process signal path can be represented as:
Process
↓
Sensor / Transmitter
↓
Analog Signal
↓
IC695ALG112
↓
RX3i Backplane
↓
RX3i CPU
↓
PLC Program
↓
Control Output / HMI / SCADA
This allows continuously varying process measurements to become usable control-system data.
Why Analog Inputs Are Important
Industrial processes frequently depend on measurements that vary over a continuous range.
Examples include:
- Temperature
- Pressure
- Flow
- Liquid level
- Position
- Speed
- Current
- Voltage
- Process concentration
Unlike a digital input, which normally represents discrete states, an analog input allows the PLC to interpret a continuously changing electrical signal.
For example, a transmitter may produce a signal corresponding to a process measurement. The analog input module converts the electrical representation into usable controller data, after which the PLC application can scale the value into engineering units.
Signal Processing Concept
A simplified analog measurement sequence is:
Physical Measurement
→
Transmitter
→
Analog Electrical Signal
→
IC695ALG112
→
Digital PLC Value
→
Engineering-Unit Scaling
→
Control Logic
The PLC application can then use the measured value for:
- Monitoring
- Alarms
- PID control
- Data logging
- HMI display
- Process sequencing
- Equipment protection
Installation Guide
1. Verify the Module
Before installation, confirm:
GE IC695ALG112
Check the model number against the system bill of materials and control-system documentation.
Do not install a module simply because it has the same physical dimensions as the existing module.
2. Inspect the Module
Before installation, inspect the IC695ALG112 for:
- Cracked housing
- Damaged terminal connections
- Bent contacts
- Corrosion
- Contamination
- Physical deformation
- Signs of overheating
A damaged analog module should not be installed until its condition has been evaluated.
3. Confirm System Compatibility
Verify:
- RX3i system compatibility
- CPU configuration
- Backplane arrangement
- Analog signal requirements
- Terminal arrangement
- Software configuration
- Field transmitter compatibility
The field signal and PLC input configuration must be compatible.
4. Check the Dimensions
The specified dimensions are:
145 × 34 × 140 mm
Provide enough cabinet space for:
- Module installation
- Terminal access
- Wiring
- Inspection
- Maintenance
- Heat dissipation
Avoid routing high-noise cables directly against analog signal wiring.
5. Verify Weight
The specified weight is:
0.45 kg
The mounting structure should securely support the module and connected wiring.
6. Prepare the Control Cabinet
Before installation:
- Confirm the cabinet is safe.
- Remove unnecessary contamination.
- Verify the mounting area.
- Inspect adjacent modules.
- Check the grounding arrangement.
- Plan analog cable routing.
Analog signals are particularly sensitive to electrical interference, so wiring layout should be considered before commissioning.
7. Isolate Power
Before installing or removing the module:
- Stop the controlled process.
- Put the machine into a safe state.
- Shut down the PLC system.
- Isolate electrical power.
- Apply lockout/tagout procedures where required.
- Verify that hazardous voltage has been removed.
Do not remove or install the module while energized unless the specific system procedure explicitly permits such operation.
8. Install the Module
Position the IC695ALG112 correctly in the designated RX3i system location.
Verify:
- Correct orientation
- Proper seating
- Secure mechanical installation
- No obstruction from adjacent equipment
Do not force the module into the backplane or mounting structure.
9. Connect Analog Field Wiring
Connect the field instrumentation according to the approved wiring diagram.
Pay particular attention to:
- Signal polarity
- Common connections
- Shielding
- Grounding
- Cable routing
- Terminal identification
Incorrect wiring can result in incorrect process values or channel faults.
10. Separate Signal and Power Wiring
Where possible, keep analog signal cables separated from:
- Motor cables
- Variable-frequency-drive cables
- Contactor wiring
- High-current conductors
- Switching power wiring
This reduces the possibility of electrical interference appearing in the analog measurement.
11. Check Shielding
For shielded analog cables, follow the system grounding strategy.
Improper shield termination can create:
- Ground loops
- Signal noise
- Measurement instability
- Offset errors
Do not assume that connecting every cable shield at every possible point is always the correct approach.
Configuration and Commissioning
Step 1 – Confirm Hardware Configuration
Verify that the PLC project includes the IC695ALG112 in the correct system position.
A hardware configuration mismatch can prevent the module from operating correctly even when the physical installation is correct.
Step 2 – Configure Input Channels
Configure each channel according to the actual field instrument.
Verify:
- Input type
- Signal range
- Channel enablement
- Engineering range
- Diagnostic settings
- Scaling requirements
Step 3 – Verify the Transmitter
Confirm that the field transmitter is producing the expected signal.
Check:
- Transmitter power
- Signal wiring
- Polarity
- Output configuration
- Process condition
Step 4 – Verify PLC Values
Monitor the raw analog input data in the controller.
Compare the PLC value with the expected transmitter output.
If the raw value is incorrect, investigate the signal path before changing application scaling.
Step 5 – Configure Engineering Units
The raw input value normally needs to be converted into meaningful engineering units.
For example:
Raw Input
↓
Input Range
↓
Engineering Range
↓
Temperature / Pressure / Flow / Level
The scaling relationship must correspond to the actual transmitter range.
Step 6 – Compare With a Reference Instrument
Where practical, compare the PLC measurement with an independent calibrated instrument.
This helps determine whether the problem originates from:
- Field sensor
- Transmitter
- Wiring
- Analog input module
- PLC scaling
Step 7 – Verify Alarms
Test configured alarm thresholds.
For example:
- High alarm
- Low alarm
- High-high alarm
- Low-low alarm
Confirm that the PLC application reacts correctly to the measured value.
Step 8 – Verify HMI or SCADA
Confirm that the analog value is correctly displayed by connected supervisory equipment.
Check:
- Engineering units
- Decimal position
- Scaling
- Alarm status
- Trend behavior
Analog Input Troubleshooting
Fault 1 – Channel Reads Zero
Possible causes include:
- Incorrect wiring
- Open circuit
- Transmitter failure
- Incorrect channel configuration
- Missing transmitter power
- Incorrect signal type
- Terminal connection problem
Diagnostic Approach
Check:
Field Instrument → Wiring → Terminal → IC695ALG112 → PLC Data → Scaling
Fault 2 – Analog Value Is Too High
Possible causes include:
- Incorrect scaling
- Wrong input range
- Signal wiring problem
- Grounding issue
- Incorrect transmitter configuration
- Electrical interference
First determine whether the raw input value or only the engineering-unit value is incorrect.
Fault 3 – Analog Value Is Too Low
Possible causes include:
- Weak transmitter output
- Wiring resistance
- Incorrect scaling
- Incorrect configuration
- Poor terminal contact
- Signal-reference problem
Measure the field signal independently before replacing the analog module.
Fault 4 – Analog Value Fluctuates
A fluctuating value can be caused by:
- Electrical noise
- Poor shielding
- Ground loop
- Loose terminal
- Unstable transmitter
- Damaged cable
- Nearby motor or VFD interference
Analog signal instability should not automatically be attributed to the IC695ALG112.
Fault 5 – All Channels Are Incorrect
If several channels exhibit similar errors, investigate common causes first:
- Module configuration
- Power supply
- Common wiring
- Grounding
- Shielding
- System configuration
A common error affecting many channels is less likely to be caused by independent sensor failures.
Fault 6 – Only One Channel Is Incorrect
If only one channel is affected, inspect:
- Field transmitter
- Channel wiring
- Terminal
- Sensor
- Individual configuration
- Channel-specific settings
Compare the affected channel with a known-good channel where appropriate.
Fault 7 – Input Value Does Not Change
Possible causes include:
- Frozen transmitter output
- Open or shorted wiring
- Incorrect configuration
- PLC application problem
- Input channel problem
- Process variable not actually changing
Change the process input under controlled conditions and observe the raw input value.
Fault 8 – Module Is Not Recognized
Possible causes include:
- Incorrect hardware configuration
- Poor module seating
- Backplane connection problem
- Power issue
- Module failure
- Configuration mismatch
Check the physical installation and hardware configuration first.
Fault 9 – Intermittent Analog Readings
Possible causes include:
- Loose terminal
- Cable vibration
- Electrical noise
- Poor shielding
- Grounding problem
- Unstable transmitter
Intermittent analog faults often require inspection while the machine is operating.
Fault 10 – HMI Value Is Wrong but Raw Input Is Correct
If the raw analog value is correct but the HMI display is wrong, investigate:
- Scaling
- Engineering-unit conversion
- PLC logic
- HMI tag configuration
- Decimal placement
Do not replace the analog module before verifying the application layer.
Fault Diagnosis Flow
Use the following sequence:
Sensor
↓
Transmitter
↓
Field Wiring
↓
Terminal
↓
IC695ALG112
↓
RX3i CPU
↓
Scaling Logic
↓
HMI / SCADA
This separates field instrumentation problems from PLC hardware and software problems.
Preventive Maintenance
Module Inspection
Inspect the IC695ALG112 periodically for:
- Physical damage
- Dust
- Corrosion
- Loose connections
- Discoloration
- Abnormal heating
Terminal Maintenance
Check:
- Terminal tightness
- Cable condition
- Connector condition
- Corrosion
- Mechanical strain
Loose terminals are a common source of intermittent analog measurements.
Signal Cable Inspection
Check analog cables for:
- Damage
- Crushing
- Abrasion
- Improper routing
- Excessive bending
- Poor shielding
Electrical Noise Control
Review the installation if analog signals are noisy.
Look for nearby:
- Motors
- VFDs
- Contactors
- Switching power supplies
- High-current cables
Where possible, route analog signal cables away from high-energy switching circuits.
Calibration Verification
For measurement-critical applications, periodically compare the PLC measurement with a suitable calibrated reference.
This can identify gradual drift before it becomes a process-control problem.
Configuration Backup
Maintain current copies of:
- PLC program
- Hardware configuration
- Analog channel configuration
- Scaling parameters
- Alarm settings
This can significantly reduce recovery time after hardware replacement.
Preventive Maintenance Table
| Maintenance Area | Recommended Action |
|---|---|
| Module Housing | Inspect for damage |
| Terminals | Check tightness and condition |
| Signal Cables | Inspect for damage |
| Shielding | Verify correct termination |
| Grounding | Check system strategy |
| Configuration | Verify channel settings |
| Scaling | Verify engineering conversion |
| Calibration | Compare against reference |
| Diagnostics | Review recurring alarms |
| Backups | Maintain current PLC configuration |
Industrial Applications
Process Temperature Monitoring
Analog transmitters can provide temperature measurements to the PLC for:
- Monitoring
- Alarm generation
- Process control
- Data logging
Pressure Monitoring
Pressure transmitters can be integrated into PLC control systems for:
- Pump protection
- Process regulation
- High-pressure alarms
- Low-pressure alarms
Flow Measurement
Analog flow transmitters can provide continuous process information for:
- Flow control
- Production monitoring
- Pump operation
- Process balancing
Tank Level Monitoring
Continuous level transmitters can be used to monitor:
- Tank levels
- Vessel levels
- High-level conditions
- Low-level conditions
- Pump control requirements
Machine Process Monitoring
Industrial machines may use analog signals for:
- Position
- Speed
- Force
- Temperature
- Pressure
The PLC can process these values to support automatic machine control.
Energy and Utility Monitoring
Analog measurement systems can also be used to monitor process or utility variables within industrial facilities.
Replacement Procedure
1. Identify the Existing Module
Confirm:
GE IC695ALG112
Record:
- System position
- Connected channels
- Field instruments
- Channel configuration
2. Back Up the PLC Configuration
Before replacement, save the current:
- PLC program
- Hardware configuration
- Channel settings
- Scaling parameters
- Alarm configuration
3. Record Wiring
Before disconnecting the module, document:
- Terminal assignments
- Channel numbers
- Signal polarity
- Shield connections
- Common connections
This is particularly important for analog systems because a wiring mistake can produce plausible but incorrect readings.
4. Put the Process in a Safe State
Stop the affected process according to the machine safety procedure.
Consider the consequences of losing analog measurements before removing the module.
5. Isolate Power
Disconnect the applicable electrical supply and verify safe conditions.
6. Remove the Existing Module
Carefully release the module and disconnect the field wiring.
Avoid damaging terminals or signal cables.
7. Inspect the Connections
Before installing the replacement, inspect:
- Terminals
- Wiring
- Shielding
- Grounding
- Backplane interface
8. Install the Replacement IC695ALG112
Install the replacement module in the correct system position.
Ensure proper seating.
9. Reconnect Field Wiring
Reconnect each channel according to the documented wiring arrangement.
Verify every channel individually.
10. Restore the Configuration
Confirm that the PLC hardware configuration and channel parameters match the actual installation.
11. Restore Power
Power up the system according to the approved procedure.
12. Verify Analog Measurements
Check:
- Module recognition
- Channel status
- Raw values
- Engineering-unit values
- Alarms
- HMI/SCADA display
13. Perform Functional Testing
Apply known process conditions or suitable test signals and verify that the PLC responds correctly.
Replacement Considerations
| Parameter | Specification / Verification |
|---|---|
| Manufacturer | GE |
| Series | RX3i |
| Model | IC695ALG112 |
| Product Type | Analog Input Module |
| Dimensions | 145 × 34 × 140 mm |
| Weight | 0.45 kg |
| Channel Configuration | Verify |
| Input Signal Type | Verify |
| Input Range | Verify |
| Resolution | Verify |
| Isolation | Verify |
| Terminal Arrangement | Verify |
| Software Configuration | Verify |
| Scaling | Verify |
| System Compatibility | Verify |
A replacement module should be selected according to the complete electrical and system configuration rather than physical size alone.
Key Advantages
- Designed for GE RX3i industrial automation architecture
- Provides analog signal acquisition for PLC applications
- Supports integration of continuously varying field measurements
- Suitable for process monitoring and machine control
- Compact 145 × 34 × 140 mm form factor
- Specified weight of 0.45 kg
- Can interface the field instrumentation layer with PLC control logic
- Suitable for structured analog troubleshooting and preventive maintenance
Technical FAQs
What is the GE IC695ALG112?
The GE IC695ALG112 is an RX3i Analog Input Module used to acquire analog signals within compatible GE RX3i PLC systems.
What are the dimensions of the IC695ALG112?
The specified dimensions are 145 × 34 × 140 mm.
What is the weight of the IC695ALG112?
The specified weight is 0.45 kg.
What is an analog input module used for?
It allows continuously varying signals from field instrumentation to be acquired by a PLC for monitoring, control, alarms, and data processing.
What types of industrial measurements can analog inputs represent?
Common applications include temperature, pressure, flow, level, position, speed, voltage, and current measurements, depending on the installed field instrumentation and module configuration.
Why is analog wiring important?
Analog signals can be sensitive to electrical interference. Incorrect wiring, poor shielding, grounding problems, and routing near high-power cables can produce unstable or inaccurate readings.
What should I check if an analog channel reads zero?
Check the field instrument, transmitter power, wiring, terminal connections, channel configuration, and PLC input data before replacing the module.
Why are all analog channels showing incorrect values?
When several channels are affected simultaneously, investigate common causes such as configuration, grounding, shielding, power, and shared wiring before replacing individual channels.
What causes a fluctuating analog signal?
Possible causes include electrical noise, poor shielding, ground loops, loose terminals, unstable transmitters, damaged cables, or nearby high-power equipment.
What if the raw input value is correct but the HMI value is wrong?
Check the PLC scaling logic, engineering-unit conversion, HMI tag configuration, and decimal placement.
Should the PLC configuration be backed up before module replacement?
Yes. The PLC program, hardware configuration, channel parameters, scaling, and alarm settings should be backed up before replacement.
Can a physically similar analog module be used as a replacement?
Not automatically. Signal type, electrical characteristics, channel configuration, compatibility, terminal arrangement, and software configuration must be verified.
Conclusion
The GE IC695ALG112 RX3i Analog Input Module is an important interface between industrial field instrumentation and the PLC control system. With specified dimensions of 145 × 34 × 140 mm and a specified weight of 0.45 kg, it provides a compact solution for analog signal acquisition within compatible RX3i automation architectures.
Reliable analog measurement depends on more than the input module itself. The complete signal chain includes the sensor, transmitter, field wiring, terminals, analog input module, PLC configuration, scaling logic, and HMI or SCADA presentation. A problem at any point in this chain can produce an incorrect process value.
For installation, technicians should verify module compatibility, isolate the control system safely, install the module correctly, connect each analog channel according to the approved wiring arrangement, and configure the PLC to match the actual field instruments.
For troubleshooting, begin at the field instrument and work toward the PLC application. Checking the transmitter, wiring, terminal connections, IC695ALG112 status, raw input data, scaling, and HMI values in sequence makes it easier to identify the true source of a fault.
Regular inspection of terminals, signal cables, shielding, grounding, configuration, and measurement accuracy can further reduce intermittent analog faults and improve the reliability of RX3i-based industrial automation systems.