Description
Product Description
The IC695CMU310 by GE (Emerson Automation) is a Max‑ON hot-standby redundancy CPU designed for the PACSystems RX3i platform. It enables two RX3i systems to operate in a synchronized primary/backup configuration, delivering high-availability control for critical industrial processes. In the event of a primary CPU failure, the backup takes over within 2–3 CPU scans, preserving I/O states and maintaining continuous operation.
This module is widely applied in mission-critical environments such as power generation, boiler control, fuel loading, and manufacturing systems where downtime must be minimized.
Key Features
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Hot-standby redundancy with sub-millisecond failover
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Maintains I/O states during CPU switchover
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300 MHz Intel Celeron CPU architecture
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Large user memory: 10 MB battery-backed RAM, 10 MB optional flash
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Dual isolated serial ports supporting Modbus RTU, SNP, and Serial I/O
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Compatible with multiple IEC 61131‑3 programming languages including Ladder, Structured Text, Function Block, and C
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In-system firmware upgradeable
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Single-slot design with dual backplane support
Technical Specifications
| Parameter |
Specification |
| Processor |
300 MHz Intel Celeron architecture |
| Boolean Execution Speed |
0.195 ms per 1000 Boolean instructions (typical) |
| Failover Time |
2–3 CPU scans (<1 ms typical) |
| User Memory |
10 MB battery-backed RAM |
| Non-Volatile Memory |
10 MB optional flash |
| Reference Table Sizes |
%I / %Q: 32 Kbits, %AI / %AQ: up to 32 Kwords each, %W: up to available RAM |
| Program Blocks |
Up to 512 blocks, max 128 KB each |
| Communication Ports |
1 × RS‑232, 1 × RS‑485, isolated |
| Supported Protocols |
Modbus RTU Slave, SNP, Serial I/O |
| Redundancy Communication |
Dedicated Ethernet LANs (requires IC695ETM001) |
| Power Supply |
+5 VDC @ 1.0 A, +3.3 VDC @ 1.25 A |
| Operating Temperature |
0°C to 60°C |
| Storage Temperature |
–40°C to +70°C |
| Clock Drift |
Max 2 seconds per day |
| Slot Width |
Single-slot module |
| Dimensions |
140 × 130 × 45 mm |
| Weight |
0.88lbs |
| Compatible Backplanes |
RX3i Universal Backplane (IC695CHS0xx), Series 90‑30 expansion backplanes |
| Battery Options |
IC695ACC302, IC693ACC302, IC698ACC701 |
Applications
The IC695CMU310 is ideal for continuous-process and mission-critical control systems requiring zero downtime. Common use cases include power plants, fuel handling systems, boiler automation, and high-reliability manufacturing lines where hot-standby redundancy is essential.
FAQ
Q: How quickly does the backup CPU take over if the primary fails?
A: Failover occurs within 2–3 CPU logic scans, typically under 1 millisecond.
Q: What programming languages are supported?
A: Ladder Diagram, Structured Text, Function Block Diagram, and C.
Q: Can this CPU operate in a single-slot backplane?
A: Yes, the IC695CMU310 is a single-slot module compatible with RX3i universal and expansion backplanes.
