Application Scenarios
At a major North American steel mill, a continuous casting line relied on a GE Series 90-70 system powered by the IC697CPM790-GD to synchronize mold oscillation, strand pulling, and spray cooling. The CPU’s ability to execute floating-point calculations in real time enabled dynamic adjustment of casting speed based on molten steel temperature and flow—reducing slab cracks by 30%. When the original CPU failed after 18 years of service, sourcing a verified replacement was urgent. A tested IC697CPM790-GD restored full operation within 24 hours, avoiding a $ 500K/hour production loss.
This scenario highlights the enduring value of the IC697CPM790-GD: not just as hardware, but as the irreplaceable brain of deeply embedded industrial processes where migration is costly or impractical.
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Technical Principles and Innovative Values
Innovation Point 1: True 32-Bit Floating-Point Engine
Unlike earlier 16-bit PLCs, the IC697CPM790-GD natively executes IEEE 754 floating-point operations—enabling direct implementation of PID loops, coordinate transformations, and thermodynamic calculations without integer scaling workarounds. This reduces programming complexity and improves control accuracy in analog-intensive applications.
Innovation Point 2: Large, Configurable Memory Architecture
With 2 MB of battery-backed RAM, the CPU can store extensive programs, data tables, and historical logs onboard. Memory is partitioned into program, data, and retentive sections, allowing critical variables (e.g., batch counters, fault logs) to survive power cycles without external storage.
Innovation Point 3: Integrated System Diagnostics
The module continuously monitors its own health—tracking battery voltage, memory integrity, scan time deviations, and communication errors. Diagnostic LEDs and software-accessible status words enable rapid troubleshooting, minimizing mean time to repair (MTTR).
Innovation Point 4: Seamless Integration with Genius I/O
As part of the 90-70 ecosystem, the IC697CPM790-GD leverages GE’s Genius bus for high-speed, deterministic I/O updates across distributed racks—critical for synchronized machine control in printing presses or bottling lines.
Application Cases and Industry Value
Case Study: Automotive Paint Shop (Germany)
A luxury car manufacturer used the IC697CPM790-GD to control robotic spray applicators and conveyor synchronization. The CPU managed over 1.200 I/O points and executed real-time path corrections based on vehicle position feedback. Its deterministic scan ensured ±2 ms timing accuracy—critical for uniform paint thickness. After 15 years, the system remains operational due to strategic spare parts stocking.
Case Study: Hydroelectric Dam Control (Canada)
Gate positioning and turbine synchronization at a remote dam are managed by a redundant IC697CPM790-GD pair. The floating-point capability enables precise water flow modeling, while redundancy ensures uninterrupted operation during winter outages. The system has operated continuously since 1998 with zero unplanned failures.
Related Product Combination Solutions
For full system functionality, the IC697CPM790-GD is typically used with:
IC697CHS790 / CHS791: 90-70 rack chassis (10/16 slots)
IC697PSD790: High-capacity power supply module
IC697CMM742: Ethernet interface module (TCP/IP, Modbus TCP)
IC697BEM731: Genius I/O bus controller
IC697ACC701: Battery backup module for RAM retention
IC697CRU942: Redundancy controller for hot-standby CPU pairs
Proficy Machine Edition (PME): Official programming and diagnostics software
Installation, Maintenance, and Full-Cycle Support
Installation requires secure seating in a compatible 90-70 rack with proper backplane alignment. The battery (IC697ACC701) must be installed and functional to prevent program loss during power interruptions. For redundant systems, firmware versions on both CPUs must match exactly.
Maintenance best practices include:
Replacing the lithium battery every 5 years
Monitoring scan time trends for performance degradation
Keeping firmware and application backups in version-controlled archives
Although GE no longer manufactures the Series 90-70. Emerson continues to provide limited support. However, lead times for new units exceed 12 months, making tested spares essential.
We specialize in supplying fully tested IC697CPM790-GD modules:
✅ Power-on self-test passed
✅ Memory integrity verified
✅ Communication ports validated
✅ Firmware version documented
✅ 24-month warranty included
Each unit is cleaned, inspected for capacitor aging, and backed by technical support for integration or emergency replacement.
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