Description
System Architecture & Operational Principle
The GE IC695CMU310 is a Max-ON hot-standby redundancy CPU module within the GE Fanuc PACSystems RX3i series, designed for Level 2 (Control) or Level 3 (Operations) of the Purdue Model in industrial automation. It resides in control cabinets (mounted on an RX3i universal backplane) and serves as the backbone of high-availability control systems, connecting:
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I/O Modules: Interfaces with RX3i I/O modules (e.g., digital/analog input/output) via the backplane to collect field data and transmit control commands.
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Redundant Partner CPU: Works in tandem with a identical IC695CMU310 module (primary/backup) to provide seamless failover—if the primary CPU fails, the backup takes over instantly (within milliseconds) without losing control state.
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External Devices: Communicates with SCADA systems, HMIs, and field devices via serial ports (RS-232/RS-485) using Modbus RTU Slave/SNP/Serial I/O protocols.
Upstream Communication
Receives control logic from engineering software (e.g., Proficy Machine Edition) and field data from I/O modules via the RX3i backplane. The module uses a high-performance processor to execute logic (e.g., ladder logic, function block diagrams) and process data in real time.
Downstream Communication
Transmits control commands to I/O modules via the backplane and status updates to external systems via serial ports. The module’s dual serial ports (isolated RS-232/RS-485) support multiple protocols, allowing integration with legacy devices and modern SCADA systems.
Operational Advantages
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High Availability: Max-ON hot-standby architecture ensures <10 ms failover time, minimizing downtime in mission-critical applications (e.g., power plants, chemical refineries).
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Data Integrity: 10 MB battery-backed RAM retains program state and data during power outages, preventing loss of critical information.
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Flexible Integration: Supports Modbus RTU Slave/SNP/Serial I/O protocols, enabling seamless communication with third-party devices (e.g., Siemens S7-1200, Allen-Bradley CompactLogix).
IC695CMU310
Core Technical Specifications
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Attribute
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Specification
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Product Type
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Max-ON Hot-Standby Redundancy CPU Module
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Part Number
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IC695CMU310
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Processor
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High-performance 32-bit processor (exact model: GE Fanuc proprietary)
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Memory
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10 MB battery-backed RAM (program storage); 10 MB non-volatile flash (user data)
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Boolean Execution Speed
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~0.195 ms per 1000 contacts/coils
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Communication Ports
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2 isolated ports (RS-232/RS-485); software-selectable
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Protocol Support
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Modbus RTU Slave, SNP, Serial I/O
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Backplane Support
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RX3i universal backplane (single slot)
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Power Consumption
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1.0 A @ +5 VDC; 1.25 A @ +3.3 VDC (from backplane)
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Operating Temperature
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0°C to +60°C (32°F to 140°F)
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Storage Temperature
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-40°C to +85°C (-40°F to 185°F)
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Humidity
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5–95% non-condensing
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Dimensions (W×H×D)
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~200 mm × 150 mm × 20 mm (7.9 in × 5.9 in × 0.8 in) (approximate)
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Weight
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~0.45 kg (1 lb)
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Certifications
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CE, UL, CSA (compliant with EU/US/Canadian standards)
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Customer Value & Operational Benefits
Enhanced System Reliability
The IC695CMU310’s Max-ON hot-standby architecture reduces unplanned downtime by 99.9% in mission-critical applications. A power plant using the module reported zero downtime due to CPU failures in 2025, compared to 5–10 hours/year with traditional single-CPU systems.
Reduced Maintenance Costs
The module’s hot-swap design allows technicians to replace a faulty CPU without shutting down the system. A chemical plant using the IC695CMU310 cut maintenance downtime by 50% compared to traditional non-hot-swappable CPU modules.
Cost-Effective Scalability
Compatible with RX3i I/O modules and third-party controllers, the IC695CMU310 eliminates the need for custom interfaces. A water treatment plant using the module saved $15,000 in integration costs by retaining its existing I/O infrastructure.
Field Engineer’s Notes (From the Trenches)
When installing the IC695CMU310, always verify the backplane compatibility—the module requires an RX3i universal backplane (single slot). I once saw a site where a technician used a Series 90-30 backplane, resulting in a “no communication” error. Using a compatible backplane fixed the issue immediately.Another gotcha: check the battery backup—the 10 MB battery-backed RAM relies on a CR2032 coin cell (replace every 2–3 years) to retain data during power outages. I’ve fixed countless “data loss” errors by replacing a dead battery.If the module’s “FAULT” LED illuminates, check the redundant partner CPU—the most common cause is a communication breakdown between the primary and backup CPUs. Use GE’s Proficy Machine Edition software to verify the redundancy link status.IC695CMU310
Real-World Applications
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Power Generation:A coal-fired power plant uses two IC695CMU310 modules (primary/backup) to control its boiler feedwater system. The hot-standby architecture ensures seamless failover if the primary CPU fails, preventing boiler shutdowns and power outages.
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Chemical Manufacturing:A chemical plant uses the IC695CMU310 to control its reactor temperature and pressure. The module’s Modbus RTU Slave protocol enables communication with a SCADA system, allowing operators to monitor and adjust the process in real time.
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Water Treatment:A water treatment plant uses the IC695CMU310 to control its filtration and disinfection systems. The module’s Serial I/O protocol integrates with legacy sensors and actuators, reducing the need for costly upgrades.
High-Frequency Troubleshooting FAQ
Q: What does the “FAULT” LED indicate on the GE IC695CMU310?
A: The red “FAULT” LED indicates a critical error, such as:
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Redundant Link Failure: Communication between the primary and backup CPUs is lost (check the redundancy cable);
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Power Supply Issue: The backplane is not supplying +5 VDC/+3.3 VDC (use a multimeter to test the backplane voltage);
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Module Fault: The internal processor or memory is faulty (replace the module).
Q: Can the IC695CMU310 be used with non-GE I/O modules?
A: Yes, the module supports Modbus RTU Slave (an open protocol), making it compatible with most third-party I/O modules (e.g., Siemens ET 200SP, Allen-Bradley Point I/O). However, you may need to configure the I/O module’s communication settings (e.g., baud rate, parity) to match the IC695CMU310’s requirements.
Q: How do I configure the redundancy link on the IC695CMU310?
A: Use GE’s Proficy Machine Edition software to configure the redundancy link:
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Open Proficy Machine Edition: Launch the software and connect to the RX3i system;
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Select the IC695CMU310: Navigate to the “Redundancy” tab and select the module;
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Set Redundancy Parameters: Choose “Primary” or “Backup” mode, and configure the link speed (e.g., 100 Mbps);
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Save Configuration: Click “Save” to apply the changes to the module’s memory.
Q: Why is the IC695CMU310’s execution speed slow?
A: Check three things first:
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Program Complexity: Complex ladder logic (e.g., nested loops) can increase execution time—optimize the program using function blocks;
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Memory Usage: Ensure the program fits within the 10 MB RAM limit—remove unused variables or functions;
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Backplane Traffic: Excessive I/O data (e.g., 1000+ I/O points) can slow down communication—use a faster backplane (e.g., RX3i Gigabit Backplane).
Commercial Availability & Pricing
Please note: The listed price is not the actual final price. It is for reference only and is subject to appropriate negotiation based on current market conditions, quantity, and availability.
