Description
🔹 Product Overview
The GE Fanuc IC697CPU781-JE is a 16 MHz, 32-bit Central Processing Unit designed for the Series 90-70 PLC platform. It is based on an 80386DX microprocessor and is intended for real-time control of industrial machines, processes, and material-handling systems.
The CPU is installed in a single rack slot and communicates with I/O modules and intelligent option modules through the Series 90-70 rack backplane. It supports up to 12K discrete inputs and outputs in any combination, as well as up to 8K analog I/O points.
The IC697CPU781 platform also supports expandable memory, battery-backed memory retention, a calendar clock, password-controlled access, software-based configuration, and a three-position operating mode switch.
⚙️ Main Features
🔹 16 MHz 32-bit CPU architecture
🔹 80386DX microprocessor
🔹 GE Fanuc Series 90-70 PLC platform
🔹 Single-slot CPU design
🔹 Supports up to 12K discrete I/O points
🔹 Supports up to 8K analog I/O points
🔹 Boolean execution performance of approximately 0.4 microseconds per function
🔹 Expandable program and data memory
🔹 Supports battery-backed memory retention
🔹 Battery-backed calendar clock
🔹 RS422/485-compatible serial programmer connection
🔹 Three-position operating mode switch
🔹 Password-controlled access
🔹 Keyswitch memory protection
🔹 Four front-panel status LEDs
🔹 Software configuration without DIP switches or jumpers
📋 Product Datasheet
🔹 Brand: GE Fanuc
🔹 Model: IC697CPU781-JE
🔹 Base CPU Model: IC697CPU781
🔹 Series: Series 90-70
🔹 Product Name: Central Processing Unit Module
🔹 Product Type: PLC CPU Processor Module
🔹 Processor: Intel-compatible 80386DX architecture
🔹 Processor Speed: 16 MHz
🔹 CPU Architecture: 32-bit
🔹 Installation: Single-slot module
🔹 Slot Requirement: CPU position / Slot 1
🔹 Supply Voltage: 5 VDC from PLC backplane
🔹 Current Consumption: Approximately 1.6 A from the 5 VDC bus, including supported expansion memory
🔹 Discrete I/O Capacity: Up to 12K inputs and outputs in any combination
🔹 Analog I/O Capacity: Up to 8K analog I/O points
🔹 Boolean Execution Speed: Approximately 0.4 microseconds per Boolean function
🔹 Serial Interface: RS422/485-compatible programmer connection
🔹 Memory Type: Configurable program and data memory
🔹 Expansion Memory: Up to 512 KB battery-backed expansion memory
🔹 Memory Options: 128 KB, 256 KB, 512 KB, and Flash-supported expansion configurations depending on the memory board
🔹 Memory Retention: Approximately 6 months without applied power under specified battery conditions
🔹 Battery Type: IC697ACC701 lithium battery
🔹 Battery Shelf Life: Approximately 10 years at 20°C
🔹 Clock: Battery-backed calendar clock
🔹 Clock Accuracy: Approximately ±3.5 seconds per day
🔹 Elapsed Time Accuracy: Approximately ±0.01% maximum
🔹 Operating Mode Switch: Three-position switch
🔹 Status Indicators: Four LEDs
🔹 Configuration: Software configured
🔹 Backplane Standard: Designed to support VME C.1 system architecture
🔹 Country of Origin: Verify from the physical product label
🔹 Dimensions: Standard Series 90-70 single-slot module dimensions; verify exact physical measurements from the supplied unit
🔹 Weight: Verify from the actual unit
🔹 Product Status: Legacy industrial automation spare part
🔹 Condition: New Surplus, subject to actual inventory condition
The CPU 781 is documented as a 16 MHz, 32-bit expandable CPU using an 80386DX processor, with support for 12K mixed discrete I/O, up to 8K analog I/O, and 0.4 microseconds per Boolean function.
🧠 CPU Processing Function
The IC697CPU781-JE performs the central processing function within a Series 90-70 PLC system.
During operation, the CPU processes the user control program, communicates with installed I/O modules, monitors system diagnostics, and coordinates real-time machine or process control.
The CPU communicates with modules installed in the PLC rack through the backplane. This allows the controller to work with discrete I/O, analog I/O, communication modules, LAN interfaces, bus controllers, and other compatible intelligent modules.
The CPU 781 is designed for system-level industrial control rather than simple standalone operation.
🔌 Power and Backplane Requirements
The module operates from the 5 VDC supply provided through the Series 90-70 PLC backplane.
The documented current requirement is approximately 1.6 A from the 5 VDC bus when expansion memory is included.
Before replacing the module, verify:
🔹 PLC rack power supply capacity
🔹 Backplane condition
🔹 Correct CPU slot position
🔹 Installed expansion memory board
🔹 Battery condition
🔹 System grounding
🔹 Existing I/O configuration
The module is identified for installation in the CPU position and should not be installed in an arbitrary I/O slot.
💾 Memory Expansion
The CPU supports configurable program and data memory through compatible expansion memory boards.
Common memory options include:
🔹 IC697MEM731 – 128 KB CMOS Expansion Memory
🔹 IC697MEM732 – 256 KB CMOS Memory with 256 KB Non-Volatile Flash Memory
🔹 IC697MEM733 – 256 KB CMOS Expansion Memory
🔹 IC697MEM735 – 512 KB CMOS Expansion Memory
🔹 IC697ACC701 – Lithium Battery
The expansion memory configuration should be recorded before replacing the CPU. The replacement system may require the same memory board and application configuration to restore normal operation.
🔗 Communication Capability
The IC697CPU781 provides an RS422/485-compatible serial programmer connection.
Depending on the complete Series 90-70 system configuration, programming and communication functions can also involve separate communication or Ethernet interface modules installed in the PLC rack.
This allows the CPU platform to operate within larger industrial automation architectures.
Before replacement, record:
🔹 Existing programming connection
🔹 Communication modules
🔹 PLC network configuration
🔹 Rack configuration
🔹 I/O assignments
🔹 Application software version
🏭 Typical Applications
The GE Fanuc IC697CPU781-JE is suitable for legacy Series 90-70 PLC installations used in industrial automation.
Typical applications include:
🔹 Process control systems
🔹 Manufacturing automation
🔹 Machine control
🔹 Material-handling systems
🔹 Conveyor systems
🔹 Industrial production lines
🔹 Water and wastewater automation
🔹 Power and utility applications
🔹 Large distributed I/O systems
🔹 Legacy PLC modernization projects
🔹 Industrial spare-parts support
🛠 Installation and Replacement Guide
1. Verify the complete model
Confirm the identification on the installed CPU.
For this version, verify:
IC697CPU781-JE
Also inspect the base CPU identification and any hardware suffixes or manufacturing revisions.
2. Record the existing configuration
Before removing the CPU, record:
🔹 Rack position
🔹 Installed expansion memory
🔹 Battery condition
🔹 PLC program version
🔹 I/O configuration
🔹 Communication modules
🔹 Network settings
🔹 Hardware revision
🔹 Fault history
3. Back up the application
If possible, save the PLC application and configuration before replacing the CPU.
This is especially important for legacy systems where the existing program may not be easily recoverable.
4. Isolate system power
Follow approved lockout and electrical isolation procedures before removing the CPU.
5. Check the battery
The CPU uses battery-backed memory.
If the application depends on retained memory, install or verify the replacement battery according to the system maintenance procedure before transferring or removing memory-related components.
6. Install the module
Insert the CPU carefully into the correct Series 90-70 rack position.
Ensure the module is fully seated in the backplane connector.
7. Restore the program and configuration
Load or verify:
🔹 PLC program
🔹 Hardware configuration
🔹 I/O assignments
🔹 Communication settings
🔹 Fault configuration
8. Perform commissioning tests
After installation, verify:
🔹 MODULE OK status
🔹 RUN status
🔹 OUTPUTS ENABLED status
🔹 MEMORY PROTECT status
🔹 I/O communication
🔹 Application execution
🔹 Alarm response
🔹 Field-device operation
🔄 Compatibility Notes
The IC697CPU781-JE belongs to the Series 90-70 CPU family.
Other Series 90-70 CPUs may have similar physical designs but different functions.
Differences may include:
🔹 Floating-point capability
🔹 Redundancy support
🔹 Processing features
🔹 Memory configuration
🔹 Application requirements
🔹 System-specific hardware functions
For replacement purposes, match the complete CPU model and installed system requirements.
Do not assume that another Series 90-70 CPU is automatically interchangeable simply because it fits the same rack.
❓ Frequently Asked Questions
Q1: What is the GE Fanuc IC697CPU781-JE?
It is a 16 MHz, 32-bit Central Processing Unit used in GE Fanuc Series 90-70 PLC systems.
Q2: What processor does the CPU use?
The CPU 781 platform uses a 16 MHz 80386DX microprocessor.
Q3: Is this a 32-bit CPU?
Yes. The IC697CPU781 is a 32-bit CPU module.
Q4: How much discrete I/O can it support?
The CPU supports up to 12K inputs and outputs in any combination.
Q5: How much analog I/O can it support?
The documented capacity is up to 8K analog I/O points.
Q6: What voltage does the CPU require?
The CPU operates from the PLC backplane 5 VDC bus.
Q7: How much current does it require?
The documented requirement is approximately 1.6 A from the 5 VDC bus, including supported expansion memory.
Q8: Can the CPU use expansion memory?
Yes. Compatible expansion memory boards support configurations up to 512 KB.
Q9: Does the CPU have battery-backed memory?
Yes. A compatible lithium battery supports memory retention and the calendar clock.
Q10: Can another Series 90-70 CPU replace it directly?
Not necessarily. The exact CPU model, application requirements, memory configuration, and system architecture should be checked before replacement.
⭐ Recommended GE Fanuc Series 90-70 Models
- GE Fanuc IC697CPU781 – 16 MHz 32-Bit Expandable CPU
- GE Fanuc IC697CPU780 – 16 MHz 32-Bit Hot Standby CPU
- GE Fanuc IC697CPU782 – 16 MHz 32-Bit Expandable Floating-Point CPU
- GE Fanuc IC697CPU788 – 16 MHz 32-Bit Triple Modular Redundancy CPU
- GE Fanuc IC697CPU789 – 16 MHz 32-Bit Triple Modular Redundancy CPU
- GE Fanuc IC697CPU771 – Series 90-70 CPU Module
- GE Fanuc IC697CPU772 – Expandable CPU Module
- GE Fanuc IC697MEM731 – 128 KB Expansion Memory Module
- GE Fanuc IC697MEM732 – CMOS and Non-Volatile Flash Memory Module
- GE Fanuc IC697MEM735 – 512 KB Expansion Memory Module
These models belong to the GE Fanuc Series 90-70 automation platform, but they should not be considered direct replacements without checking the installed PLC application, memory requirements, and system configuration.
🔍 Inspection Before Shipment
For a New Surplus GE Fanuc IC697CPU781-JE module, recommended inspection includes:
🔹 Verify the complete IC697CPU781-JE identification
🔹 Check the CPU front panel
🔹 Inspect the backplane connector
🔹 Check the battery connector
🔹 Inspect the memory expansion area
🔹 Check the operating mode switch
🔹 Inspect the status LEDs
🔹 Check for connector damage
🔹 Inspect for corrosion or contamination
🔹 Record hardware identification markings
🔹 Perform power-up diagnostics when compatible test equipment is available
🔹 Verify memory recognition
🔹 Check communication functions
🔹 Package using ESD-safe protective materials
📌 Product Identification
Brand: GE Fanuc
Model: IC697CPU781-JE
Product Name: Series 90-70 CPU Module
Processor: 80386DX
Processing Speed: 16 MHz
Architecture: 32-Bit
Supply Voltage: 5 VDC
Current Requirement: Approximately 1.6 A
Discrete I/O Capacity: Up to 12K Points
Analog I/O Capacity: Up to 8K Points
Installation: Single-Slot CPU Position
Application: Industrial PLC and Automation Systems
Key Selection Requirement: Match the complete model, CPU configuration, memory board, application program, rack configuration, and system requirements before replacement.
