GE IC697CPU772K Programmable Controller CPU Module

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 IC697CPU772K (IC697CPU772 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 IC697CPU772K 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.
• 772: Specifies the hardware performance tier (3.5 MHz clock rate, 32-bit 80386DX processor, embedded floating-point unit, and 512 KB expansion CMOS RAM 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 IC697CPU772K leverages direct VMEbus backplane interfacing to maintain deterministic data transmission across the rack assembly. The 32-bit internal data bus structure facilitates real-time signal transfer between the primary CPU processor and high-density I/O 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 on the IC697CPU772K module without losing the application program stored in CMOS RAM?

A: Power must remain applied to the Series 90-70 backplane rack during battery replacement. Remove the protective front door of the module, unclip the existing lithium battery connector from the module board, and immediately plug in the replacement battery assembly. If power is removed while the battery is disconnected, contents of the volatile CMOS RAM will be lost unless stored in optional non-volatile EEPROM/Flash memory.

Q: Can the IC697CPU772K module be inserted or removed from the VME backplane while the rack power supply is energized?

A: No. The GE Series 90-70 backplane does not support hot-swapping for CPU modules. Power to the rack power supply must be disconnected before installing or removing the IC697CPU772K. Inserting the module into an energized backplane may cause electrical arcing across the gold pin contacts, damage memory components, or force the system into a fault lockup.

Q: How does the front-panel 3-position keylock switch affect program execution and communications?

A: The top position (RUN/ENABLE) allows program execution and enables physical outputs. The middle position (RUN/DISABLE) allows program execution while forcing physical outputs into a de-energized safe state. The bottom position (STOP/NO CHANGE) halts program execution and disables write access to memory configurations from connected programming software via the serial port.

Field Installation Guidelines

1. Power Verification: Ensure main power to the Series 90-70 rack is turned off at the primary circuit breaker before physically aligning the module with the chassis slot guides.
2. Card Slot Alignment: Slide the IC697CPU772K card into Slot 1 (the dedicated CPU slot at the far left of the main rack assembly). Ensure top and bottom plastic guides engage smoothly with the card frame.
3. Backplane Engagement: Firmly push the module flush against the backplane until the upper and lower faceplate retaining levers snap locked over the rack frame edges. Tighten the top and bottom securing screws to 0.8 Nm (7 in-lb) torque.
4. Shielding & Grounding: Verify that the rack chassis ground wire (minimum 14 AWG / 2.5 mm sq) is bolted directly to the cabinet star ground point. The module faceplate must make direct metal-to-metal contact with the grounded rack frame to ensure ESD immunity.
5. Battery Initialization: Connect the pre-installed lithium battery leads to the module battery connector pin prior to system energization to prevent RAM initialization errors on first boot.