GEIC697CPU771K CPU Processors

Configured for high-speed logic processing and real-time floating-point calculations in GE Fanuc Series 90-70 programmable logic controller racks, the General Electric IC697CPU771K (IC697CPU771 CPU Module) provides direct physical/electrical execution. This VMEbus-based central processing module executes ladder logic, C programming, and block-structured control algorithms across high-density discrete and analog I/O architectures. It interfaces directly with the passive backplane to manage system timing, execution sweeps, and deterministic memory mapping without external coprocessors.

Suffix Breakdown & Model Matrix

The catalog number structure for the GE IC697CPU771K decodes into specific hardware and revision attributes across the Series 90-70 platform:

• IC697: Identifies the GE Fanuc Series 90-70 high-performance VMEbus controller family.
• CPU: Designates the central processing unit module type responsible for sweep control and program execution.
• 771: Specifies the hardware performance tier (12 MHz clock rate, 80C186 processor, floating-point support, and 512 KB maximum RAM expansion capacity).
• K: Indicates the hardware and embedded firmware revision level, incorporating component-level circuit optimizations and backplane bus noise immunity enhancements.

Hardware Specifications

Backplane Bus Communication Velocity & Firmware Flash Compatibility

The General Electric IC697CPU771K leverages direct VMEbus standard C.1 backplane interfacing to maintain deterministic data transmission across the rack assembly. The internal data bus structure facilitates real-time signal transfer between the primary CPU processor and high-density I/O or smart option modules with zero latency overhead. Firmware flash compatibility within the Revision K hardware footprint ensures synchronous instruction fetching during dense ladder logic cycles. The module's backplane bus communication velocity is optimized to execute high-rate I/O scan sweeps while preventing data corruption through hardware-enforced parity verification and backplane noise isolation filters.

Frequently Asked Questions

Q: What is the procedure for replacing the memory backup battery (IC697ACC701) on the IC697CPU771K module without losing program data?

A: Power must remain applied to the Series 90-70 backplane rack during battery replacement. Open the protective front cover of the module, detach the existing lithium battery connector from the main CPU board, and attach the replacement IC697ACC701 battery. If power is interrupted while the battery is disconnected, volatile CMOS RAM contents will be cleared unless backed up to non-volatile memory.

Q: Can the IC697CPU771K module be inserted into or removed from the VME backplane while the rack power supply is energized?

A: No. The GE Series 90-70 VME backplane does not support hot-swapping for CPU modules. Power to the rack assembly (IC697CHS750, 782, 783, 790, 791) must be switched off prior to inserting or removing the IC697CPU771K to prevent backplane bus faults or hardware damage.

Q: Which programming software packages support configuration and downloading to the IC697CPU771K via the serial interface?

A: Program configuration and downloads are executed using Logicmaster 90-70 (MS-DOS/Windows), VersaPro Professional Edition, or Proficy Machine Edition Logic Developer PLC Professional Edition. Serial connection is established through the integrated 15-pin RS-485 port via an RS-485/RS-422 to RS-232 converter connected to the host PC.

Field Installation Guidelines

1. Power Verification: Ensure main power to the Series 90-70 chassis (IC697CHS series) is disconnected before installing the CPU card.
2. Card Slot Alignment: Slide the IC697CPU771K into Slot 1 of Rack 0 (the dedicated primary CPU slot) along the card slot guides.
3. Backplane Engagement: Firmly push the card until the backplane connectors fully seat into the VME C.1 backplane pins. Lock the upper and lower faceplate retaining levers and tighten the securing screws.
4. Shielding & Grounding: Ensure the rack enclosure grounding strap (minimum 14 AWG / 2.5 mm sq) connects directly to cabinet star ground. The module faceplate must maintain metal-to-metal frame grounding to minimize noise interference.
5. Battery Initialization: Connect the IC697ACC701 lithium battery connector to the main board terminal before powering up the system to maintain RAM integrity.