The GE IC697CPU789 is a high-integrity triple modular redundancy (TMR) CPU module designed for the GE Fanuc Series 90-70 PLC platform. It is engineered for mission-critical industrial automation systems requiring fault tolerance, continuous operation, and safety-grade control logic.
Unlike standard CPUs in the 90-70 family, the IC697CPU789 is built for voted redundant architectures, where multiple CPUs run in parallel and system decisions are made through majority logic. This makes it especially suitable for ESD systems, refinery safety systems, and high-risk process industries.
Technical Specifications
The IC697CPU789 delivers industrial-grade redundancy control with deterministic execution.
| Parameter | Specification |
|---|---|
| Model | IC697CPU789 |
| Product Type | PLC CPU Module |
| Series | GE Fanuc Series 90-70 |
| Processor | Intel 80386DX |
| Clock Speed | 16 MHz |
| Architecture | 32-bit CPU with floating-point support |
| Memory | Up to 512 KB battery-backed RAM |
| User Memory | ~200 KB application space (typical allocation) |
| I/O Capacity | Up to 12,000 discrete I/O (simplex mode) |
| Voting I/O | 2,048 voted discrete I/O + 1,024 voted analog inputs |
| Analog Capacity | Up to 8,000 analog I/O (simplex mode) |
| Execution Speed | ~0.4 µs per Boolean instruction |
| Communication | RS-422 / RS-485 serial |
| Ethernet Support | Via external modules |
| Redundancy | Triple Modular Redundancy (TMR) system support |
| Power Requirement | 5 V DC backplane (~1.6 A) |
| Slot Type | Single-slot rack module |
This CPU is designed for high-integrity control systems where fault detection and voting logic are required for safety assurance.
Physical Dimensions & Weight
| Parameter | Value |
|---|---|
| Dimensions (L × W × H) | ≈ 263 mm × 58 mm × 28 mm |
| Weight | ≈ 0.5 kg – 1.6 kg (varies by revision) |
Its compact single-slot design allows installation in GE Series 90-70 racks such as CHS750, CHS790, and CHS791, supporting redundant system architectures.
Recommended Related Models
IC697CPU789 is typically used with:
- GE IC697CHS790 PLC Rack
- GE IC697PWR711 Power Supply Module
- GE IC697RCM711 Redundancy Communication Module
- GE IC697BEM731 Genius Bus Controller
- GE IC697CMM741 / CMM742 Ethernet Modules
- GE IC697BEM713 Bus Transmitter Module
These modules form a complete TMR-based GE 90-70 safety automation system.
Popular GE Series 90-70 CPU Modules
- IC697CPU731 – Entry-level CPU
- IC697CPU772 – High-performance floating-point CPU
- IC697CPU780 – Hot standby redundancy CPU
- IC697CPU788 – Safety-oriented redundancy CPU
- IC697CPU789 – Triple Modular Redundancy (TMR) CPU
These CPUs are selected based on performance, redundancy level, and safety integrity requirements.
