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- Single-Slot CPU Module
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Product Overview
The GE IC693CPU341T Single-Slot CPU Module is a central processing unit designed for the GE Fanuc Series 90-30 programmable logic controller (PLC) platform. It serves as the main processing component of a modular automation system, executing user programs, processing input and output data, managing internal registers, and coordinating communication with connected control equipment.
The Series 90-30 platform is used in industrial automation applications that require programmable logic control, equipment sequencing, machine coordination, and process monitoring. Within this architecture, the CPU module performs the logical operations that determine how the system responds to field signals and operating conditions.
The IC693CPU341T uses an 80C188XL processor operating at 20 MHz and provides up to 80 KB of user program memory. Its typical Boolean logic execution rate is approximately 0.3 milliseconds per 1K of logic. These capabilities support a range of control tasks involving discrete signals, analog data, internal registers, timers, and counters.
As a single-slot CPU module, the IC693CPU341T is installed in a compatible Series 90-30 CPU baseplate. The system can support up to five baseplates in total: one CPU baseplate and up to four expansion and/or remote baseplates, subject to system configuration requirements.
The module also supports serial communication through a port connected via the PLC power supply. Its built-in serial interface supports SNP and SNP-X slave protocols. Additional communication functions may require compatible communication option modules.
For industrial maintenance and spare-parts procurement, identifying the exact catalog number and hardware revision is important. Different revisions of the Series 90-30 CPU family may have differences in memory-storage support, firmware compatibility, and system configuration requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | GE |
| Manufacturer | GE Fanuc / GE Intelligent Platforms |
| Model | IC693CPU341T |
| Product Series | Series 90-30 |
| Product Type | Single-Slot CPU Module |
| Main Function | PLC central processing |
| Processor Type | 80C188XL |
| Processor Speed | 20 MHz |
| Maximum User Program Memory | 80 KB |
| Typical Boolean Logic Scan Rate | 0.3 ms per 1K of logic |
| Maximum Baseplates | 5 total |
| CPU Baseplates | 1 |
| Expansion / Remote Baseplates | Up to 4 |
| Power Requirement | 5 V DC backplane supply |
| Current Consumption | 490 mA from +5 V DC |
| Discrete Input References | 512 (%I) |
| Discrete Output References | 512 (%Q) |
| Analog Input References | 1,024 words (%AI) |
| Analog Output References | 256 words (%AQ) |
| Register Memory | 9,999 words (%R) |
| Discrete Global Memory | 1,280 bits (%G) |
| Internal Coils | 1,024 bits (%M) |
| Temporary Output Coils | 256 bits (%T) |
| System Status References | 128 bits (%S) |
| Timers and Counters | More than 2,000 |
| Built-in Serial Communication | SNP / SNP-X slave |
| Battery-Backed Clock | Supported |
| Operating Temperature | 0 to 60°C ambient |
| Dimensions Provided | 130 × 33 × 119 mm |
| Weight Provided | 0.27 kg |
Specifications are based on the Series 90-30 IC693CPU341 family documentation. Confirm the exact hardware revision and firmware requirements for the IC693CPU341T before replacement or system modification.
Function and Working Principle
The IC693CPU341T is the main processing component of a Series 90-30 PLC system. It executes the control program and coordinates data exchange between the controller, I/O modules, and communication devices.
1. PLC Program Execution
The CPU executes the user-defined control logic stored in its program memory. The logic determines how the PLC responds to input signals, internal conditions, timers, counters, and other program instructions.
For example, in an automated production line, the CPU can process signals from photoelectric sensors and limit switches, determine whether operating conditions are satisfied, and activate the appropriate output logic.
The controller repeatedly executes its programmed logic to maintain the required sequence of machine operations.
2. Input Data Processing
The CPU processes input references associated with connected discrete and analog I/O modules.
Discrete input references represent binary conditions such as an equipment start signal, safety interlock status, or sensor activation. Analog input references can represent process values such as pressure, temperature, or flow when compatible analog input modules are installed.
The CPU uses these values in the control program to determine the next system response.
3. Output Control
After processing the program logic, the CPU updates output references used by connected output modules.
These outputs can control equipment such as:
- Motor starters
- Indicator lamps
- Solenoid valves
- Relays and contactors
- Pneumatic actuators
- Industrial alarm devices
The CPU does not directly provide all field-level output power. Instead, it coordinates the output logic through the installed I/O modules and their associated electrical circuits.
4. Memory and Data Management
The IC693CPU341T provides user program memory and several internal data areas for storing control information.
Its memory organization includes:
- %R registers: Used for numerical values and application data.
- %I references: Used for discrete input status.
- %Q references: Used for discrete output status.
- %AI references: Used for analog input data.
- %AQ references: Used for analog output data.
- %M internal coils: Used for internal Boolean control conditions.
- %G global memory: Used for discrete global data.
- %T temporary coils: Used for temporary output logic.
These memory areas allow the PLC program to manage machine states, process values, alarms, operating parameters, and sequencing information.
5. Communication Management
The CPU provides a built-in serial communication capability through the connector on the PLC power supply. It supports SNP and SNP-X slave protocols.
Additional communication functions depend on compatible option modules. For example, a CMM module may be required for certain SNP/SNP-X master, CCM, or RTU slave functions, while a PCM module may be required for RTU master communication.
This modular communication architecture allows the Series 90-30 system to be adapted to different industrial control environments.
Role in Industrial Control Systems
The IC693CPU341T is the central processing element in a Series 90-30 PLC installation. Its primary responsibility is to coordinate the operation of the controller and its connected equipment.
Centralized Machine Control
In automated machinery, multiple sensors and actuators must operate in a defined sequence. The CPU processes field conditions and executes the logic that determines when each operation should occur.
For example, a packaging machine may use sensor signals to detect product position, control conveyor movement, and activate a sealing mechanism. The CPU coordinates these operations according to the programmed sequence.
Process Monitoring
The CPU can process data from compatible analog and discrete input modules. This allows a PLC system to monitor process conditions and respond when measured values reach configured thresholds.
In a water treatment installation, for example, the PLC may process pump status, tank-level signals, and pressure measurements to coordinate equipment operation.
I/O System Coordination
The Series 90-30 architecture supports local, expansion, and remote baseplates. The CPU coordinates the system’s I/O data and control logic according to the configured hardware arrangement.
This modular structure allows engineers to expand a control installation as additional sensors, actuators, or process functions are introduced.
Equipment Interlocking
The CPU can execute interlocking logic that prevents equipment from operating when required conditions are not satisfied.
For example, a motor may be prevented from starting if a machine guard signal is not confirmed or if another part of the production sequence has not completed.
Safety-related functions must still be implemented using appropriately rated safety equipment and an approved safety architecture. A standard PLC CPU should not be treated as a substitute for a certified safety controller.
Industrial Applications
The GE Fanuc IC693CPU341T can be used in legacy Series 90-30 automation systems across different industrial sectors.
1. Manufacturing Automation
Manufacturing equipment often requires coordinated control of motors, sensors, pneumatic devices, and production sequences.
The IC693CPU341T can execute the PLC program that manages these operations, processes field signals, and coordinates the connected I/O system.
Typical applications include assembly equipment, automated workstations, and production machinery.
2. Material Handling Systems
Conveyors, transfer stations, and sorting equipment rely on sensor signals and programmed sequences to move materials through a facility.
The CPU can process product-detection signals and coordinate the operation of motors, diverters, and other actuators through compatible I/O modules.
3. Water and Wastewater Treatment
Water treatment facilities use PLC systems to coordinate pumps, valves, level switches, and process instruments.
The IC693CPU341T can serve as the controller in an existing Series 90-30 installation, executing logic for equipment sequencing and process monitoring.
4. Packaging Machinery
Packaging systems require repeatable sequences for feeding, positioning, filling, sealing, and product transfer.
The CPU can manage the logic that coordinates sensors, motors, and output devices, helping maintain the programmed machine sequence.
5. Pumping and Auxiliary Equipment
Industrial facilities often use PLC-controlled pumping systems for water circulation, cooling, lubrication, and other auxiliary processes.
The CPU can process operating conditions and coordinate pump start/stop logic, alarms, and equipment interlocks.
6. Industrial Utilities
The Series 90-30 platform may also be found in legacy utility systems, including ventilation, compressed-air auxiliaries, and building-related industrial equipment.
The IC693CPU341T can continue supporting these installations when its hardware, firmware, and connected modules remain compatible.
Installation and System Integration
Proper installation and configuration are essential for reliable operation of the IC693CPU341T.
1. Verify Baseplate Compatibility
The IC693CPU341T is designed for a compatible GE Fanuc Series 90-30 CPU baseplate.
Before installation, confirm that the baseplate, power supply, module arrangement, and system configuration are suitable for this CPU model.
The module occupies one slot in the CPU baseplate. Do not attempt to install it in an incompatible PLC family or unsupported rack configuration.
2. Check Power Supply Requirements
The CPU requires 490 mA from the +5 V DC backplane supply.
When planning the PLC system, calculate the total current demand of the CPU and all installed modules. The selected power supply must have sufficient capacity for the complete rack configuration.
Insufficient power capacity can cause unstable operation, startup problems, or unexpected module faults.
3. Confirm Expansion Baseplate Configuration
The Series 90-30 system can support up to five baseplates in total for this CPU configuration:
- One CPU baseplate.
- Up to four expansion and/or remote baseplates.
The exact arrangement depends on the system design and applicable hardware restrictions. Confirm cable requirements, rack configuration, and module compatibility before expanding an existing installation.
4. Configure the PLC Program
The user program must be compatible with the CPU’s memory capacity, instruction set, and firmware revision.
Before replacing an existing CPU, back up the current application program and relevant configuration information. Verify that the replacement hardware revision supports the required program and memory-storage method.
5. Connect Communication Interfaces
The built-in serial communication capability uses the connector on the PLC power supply and supports SNP/SNP-X slave protocols.
Additional communication functions may require compatible CMM or PCM option modules. Verify the required protocol, module location, firmware support, and cabling before connecting the CPU to external equipment.
6. Perform Startup Checks
After installation, inspect the module seating, baseplate connections, power supply, and communication wiring.
During commissioning, verify:
- CPU startup and status indicators.
- Program operation and memory status.
- Input and output reference updates.
- Communication with connected devices.
- Expansion baseplate operation.
- Alarm and interlock logic.
- Response to simulated or actual field conditions.
Record the final hardware configuration and program revision for future maintenance.
Compatible System Components
The IC693CPU341T operates as part of the GE Fanuc Series 90-30 modular PLC platform. The following component categories may be used in a compatible installation.
| Component | Function | Integration Considerations |
|---|---|---|
| Series 90-30 CPU baseplate | Provides the mounting and backplane interface for the CPU | Confirm compatibility with the IC693CPU341T |
| Series 90-30 power supply | Supplies power to the PLC backplane | Ensure sufficient +5 V DC current capacity |
| Discrete input modules | Receive signals from switches and sensors | Verify input voltage and electrical characteristics |
| Discrete output modules | Control relays, contactors, and actuators | Confirm output type and load ratings |
| Analog input modules | Acquire analog process measurements | Check signal ranges and module configuration |
| Analog output modules | Provide analog control references | Verify output type and connected device requirements |
| Expansion baseplates | Increase the available I/O capacity | Observe the system’s baseplate limits |
| Remote I/O equipment | Extends the control system to remote locations | Verify supported architecture and communication modules |
| CMM communication module | Provides additional communication functions | Confirm protocol and firmware compatibility |
| PCM module | Supports specific communication and processing functions | Check the required RTU and other communication functions |
| Programming software | Used to develop, monitor, and maintain PLC programs | Confirm software compatibility with the CPU revision |
These are system-level components and are not necessarily supplied with the CPU module.
Alternative Models and Replacement Considerations
When maintaining an existing Series 90-30 PLC system, replacement selection should be based on program compatibility, memory requirements, communication functions, and the installed hardware configuration.
| Related Model | General Description | Replacement Considerations |
|---|---|---|
| IC693CPU340 | Series 90-30 single-slot CPU with lower user memory capacity | Not equivalent to CPU341; verify program memory requirements |
| IC693CPU350 | Series 90-30 CPU with a different performance and memory configuration | Check processor capability and application compatibility |
| IC693CPU351 | Series 90-30 CPU with additional serial communication capabilities | Review communication and program requirements |
| IC693CPU352 | Series 90-30 CPU with additional processing features | Verify instruction and application compatibility |
| IC693CPU360 | Higher-capacity Series 90-30 CPU family member | Check memory, firmware, and system configuration |
| IC693CPU374 | Series 90-30 CPU with integrated Ethernet capability | Requires a broader review of architecture and communication configuration |
| PACSystems RX3i CPU | A different GE automation platform | Not a direct plug-in replacement; migration engineering is required |
Before selecting an alternative, compare the following:
- CPU architecture and processor capability.
- User program memory capacity.
- Firmware and hardware revision.
- Supported instruction set.
- I/O reference capacity.
- Serial and network communication requirements.
- Baseplate and expansion compatibility.
- Power supply capacity.
- Programming software and project-file compatibility.
A CPU with a higher processing speed or larger memory capacity is not automatically a direct replacement. Changes to the PLC architecture may require program conversion, hardware modifications, and recommissioning.
Key Advantages
Single-Slot Installation
The IC693CPU341T occupies one CPU slot in a compatible Series 90-30 baseplate, allowing the remaining system slots to be used according to the configured hardware arrangement.
80 KB User Program Memory
Its program memory supports a range of PLC control applications involving machine sequencing, equipment interlocks, and process coordination.
20 MHz Processing Speed
The 80C188XL processor operates at 20 MHz and provides a documented typical Boolean logic execution rate of 0.3 ms per 1K of logic.
Modular System Architecture
The CPU supports a Series 90-30 configuration with one CPU baseplate and up to four additional expansion and/or remote baseplates.
Built-in Serial Communication
The CPU supports SNP and SNP-X slave communication through the connector on the PLC power supply.
Flexible Data Handling
Separate input, output, analog, register, and internal memory references allow the PLC program to organize and process different types of control data.
Legacy System Maintenance
The IC693CPU341T remains relevant to facilities operating Series 90-30 equipment. Accurate identification and sourcing can help maintenance teams keep existing automation systems operational.
Technical FAQs
1. What is the GE IC693CPU341T?
The IC693CPU341T is a single-slot central processing unit for the GE Fanuc Series 90-30 PLC system. It executes user programs and coordinates the operation of connected I/O and communication modules.
2. What processor does the IC693CPU341T use?
It uses an 80C188XL processor operating at 20 MHz.
3. How much user program memory does this CPU provide?
The IC693CPU341 provides up to 80 KB of user program memory.
4. What is its typical logic execution speed?
Its documented typical Boolean logic scan rate is approximately 0.3 milliseconds per 1K of logic.
5. How many baseplates can the system support?
The documented configuration supports up to five baseplates in total: one CPU baseplate and up to four expansion and/or remote baseplates.
6. What power supply does it require?
The CPU draws approximately 490 mA from the +5 V DC PLC backplane supply. The complete rack’s power requirements must be calculated before installation.
7. Does the IC693CPU341T support serial communication?
Yes. Its built-in serial communication capability supports SNP and SNP-X slave protocols through the connector on the PLC power supply.
8. Can it support Ethernet communication?
The CPU can be used with compatible communication option modules in supported Series 90-30 configurations. It does not have the same integrated Ethernet interface as CPU models specifically designed with built-in Ethernet. Confirm the required communication module and system architecture.
9. Is the IC693CPU341T compatible with all Series 90-30 modules?
Not necessarily. Module compatibility depends on the baseplate, power supply, firmware, hardware revision, and system configuration. Verify the relevant installation documentation before adding or replacing modules.
10. What should be checked before purchasing a replacement?
Confirm the full catalog number, hardware revision, physical condition, memory-storage configuration, firmware requirements, and compatibility with the existing PLC program. For critical installations, request suitable functional testing before returning the module to service.
Procurement and Maintenance Recommendations
When sourcing the GE IC693CPU341T, verify the full model number and revision information on the product label. Series 90-30 CPU modules may have similar appearances while differing in memory capacity, communication functions, and hardware revisions.
For used or refurbished units, inspect the module housing, edge connector, circuit board condition, and status indicators. Request photographs of the actual unit and available test information. Confirm whether the module is supplied with any required accessories.
Before replacing a CPU in an operating system, back up the existing PLC program and configuration data. Record the current firmware version, rack arrangement, communication settings, and connected I/O modules. This information can reduce commissioning time and help prevent compatibility problems.
During routine maintenance, check the PLC cabinet environment, power supply condition, grounding, connector seating, and battery-related status where applicable. Maintain a current copy of the control program and document changes made during troubleshooting.
For long-term equipment planning, evaluate whether the existing Series 90-30 system should continue to be maintained or whether a migration to a newer PLC platform is appropriate. A platform upgrade may involve hardware replacement, program conversion, wiring changes, and a new commissioning process.
Conclusion
The GE IC693CPU341T Series 90-30 Single-Slot CPU Module is a central processing component designed for modular industrial PLC control systems. With an 80C188XL processor operating at 20 MHz, up to 80 KB of user program memory, and support for a five-baseplate system configuration, it provides the processing and data-management functions required by compatible Series 90-30 installations.
Its support for discrete and analog data references, internal registers, timers, counters, and SNP/SNP-X slave communication makes it suitable for a range of legacy machine-control and process-automation applications.
For maintenance and replacement projects, confirming the exact hardware revision, firmware compatibility, power requirements, and PLC program configuration is essential to ensuring reliable integration into an existing automation system.