SPECIFICATIONS
Part No.: IC697MEM735
Manufacturer: General Electric
Product Type: Expandable CPU Module
Availability: In Stock
Update Rate: 8 msec
Max Output Load: 5 mA
Series: VersaMax
Functional Description
IC697MEM735 is an expandable CPU module developed by GE Fanuc. It is designed to enhance compatible CPU modules' data and logic memory capacity, such as the 780, 781, 782, 788, and 789 series. Available in configurations of 128 KB, 256 KB (including an additional 256 KB of non-volatile flash memory), and 512 KB, the component is a valuable resource for applications requiring extensive memory expansion. It is installed directly onto the CPU module as a daughterboard, utilizing a designated memory expansion slot. Its compact, integrated design makes installation straightforward, without consuming additional rack slots.
Product Features
- Essential Memory Support: As many GE Fanuc Series 90-70 CPUs lack internal RAM, this module is a vital component that provides the primary working memory for logic execution and data storage.
- Battery Backup for RAM: In the event of power loss, the module depends on the CPU’s onboard battery to retain volatile memory content (SRAM). This allows the controller to resume normal operations without data loss once power is restored.
- Flash Memory Support: The 256 KB variant includes non-volatile flash memory, allowing users to store critical data that must survive both power outages and battery failure. Flash memory is ideal for retaining configuration files, setpoints, and fault history.
- Error Detection and Integrity Checks: The CPU continuously monitors memory health by performing checksum validation and parity error detection across the SRAM memory. These mechanisms help prevent undetected data corruption and ensure consistent system operation.
Power Considerations
Proper handling of power during installation is crucial to maintain equipment safety and data integrity:
Pre-Installation Precautions:
- Before installing the module, ensure the rack power is turned off to avoid short circuits or electrical damage.
- Align the connectors precisely between the CPU and memory module.
- Use the supplied screws and standoffs to firmly secure the module, ensuring mechanical and electrical stability.
Post-Installation Procedure:
- After securely mounting the CPU and memory module into the rack, restore power to the system.
- The memory can then be cleared or initialized using GE Fanuc’s programming software—compatible with both Windows and MS-DOS environments.
- Clear instructions and commands within the software ensure safe configuration and memory verification.
Battery and Memory Retention
- Battery Type: The system uses the ACC701 lithium battery, which not only retains memory but also powers the CPU's real-time clock/calendar.
- Battery Replacement Best Practices: To avoid data loss, always install the new battery before removing the old one. This procedure ensures continuous power to the SRAM and maintains both memory content and timekeeping functions. Regular battery checks and preventive replacement schedules are recommended, especially in critical applications such as power generation, chemical processing, or transportation control.
Installation Instructions
- Preparation: Ensure that the power to the rack is turned off before beginning the installation process.
- Align Components: Align the connectors on the expansion memory board with the CPU connectors. Position the captive screws on the expansion memory board so they match up with the standoffs pre-installed on the CPU.
- Attach the Expansion Memory Board: Carefully push the expansion memory board onto the CPU connector, making sure that the screws are still aligned with their respective standoffs.
- Secure the Screws: Using a 1 Phillips screwdriver, firmly tighten each of the expansion memory board screws into the standoffs.
- Install the CPU Module: With the rack power still off, place the CPU module into its designated slot in the rack.
- Power On and Clear Memory: Turn the rack power back on once installation is complete. To clear the memory, use compatible programming software, such as MS-DOS or Windows, following the detailed instructions found in the Programming Software User's Manual.
The WOC team is always available to help you with your Mark I and II requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IC697MEM735?
It is an expandable CPU module developed by GE under VersaMax series.
How does the Expansion Memory retain data during power loss?
The CPU’s onboard battery helps retain memory when external power is unavailable. Additionally, the module’s flash memory maintains data integrity even without battery power.
What error-checking mechanisms are in place for Expansion Memory?
The CPU employs checksum-based continuous error checking for program memory, which includes parity error detection on each byte of SRAM memory to safeguard against memory errors.
Do I need a manual for installation?
Yes, refer to the Programmable Controller Installation Manual and related data sheets for detailed instructions.
How do I clear memory after installation?
Use MS-DOS or Windows programming software as instructed in the Programming Software User's Manual to clear memory after installation.
