Description
GE Fanuc IC697MEM735
I. Basic Information
Model: IC697MEM735Brand: GE Fanuc (Emerson)Series: GE Series 90-70 VME Bus PLC Control SystemProduct Type: 32-bit CMOS CPU dedicated memory expansion daughterboard, installed as a sub-card on the CPU motherboard without occupying independent rack slots, serving as the essential operating and data storage hardware for 780/781/782/788/789 series CPUs, since the original CPU baseboard is not equipped with built-in RAM.
Product Positioning
IC697MEM735 provides four standard capacity configurations: 128KB SRAM, 256KB SRAM, 256KB SRAM+256KB non-volatile Flash, 512KB SRAM, which supports large complex control programs, batch process data, formula parameters and fault log storage. SRAM relies on the IC697ACC701 lithium battery for power-failure data backup with a maximum 6-month data retention period; the Flash version can permanently solidify programs and key parameters even when the battery fails, avoiding system shutdown caused by program loss. Equipped with byte-level parity check and CPU global checksum dual error detection mechanism, it can timely alarm for memory hardware damage and data bit flip faults, widely used in thermal power, metallurgy, petrochemical and other process industrial main control systems as a standard replacement spare part for hardware failure and program capacity expansion renovation.
Hardware Architecture
The module adopts flame-retardant PCB with conformal coating, complying with VME C.1 bus specification, consisting of five core functional units: 32-bit CMOS high-speed storage unit, byte-level parity error detection unit, dedicated CPU daughterboard interface unit, backup power management unit, ESD and surge electromagnetic protection unit. The daughterboard obtains power from the CPU backplane 5V bus, with impedance-matched signal lines to suppress high-frequency bus interference and ensure stable memory read-write operation.
Mounting & Supporting System
- Mounting: Embedded daughterboard installation on CPU motherboard, fixed by screws and insulating studs, dimension: 180mm×140mm×30mm, net weight: 1.2kg
- Configuration Software: Proficy Machine Edition for memory clearing, program download and hardware fault diagnosis
- Compatible CPU: Series 90-70 780/781/782/788/789 processors
- Supporting Accessories: IC697ACC701 backup lithium battery, insulating fixing studs
- Typical Industries: Thermal power, oil & gas, metallurgy, municipal water treatment, cement industrial PLC main control system.
Product Characteristics
- Multiple optional memory capacities meet the storage requirements from small sequential control to large complex interlock programs, and the Flash version realizes dual program backup to eliminate the risk of program loss caused by battery aging.
- Dual hardware error detection mechanism prevents equipment misoperation and safety accidents caused by memory data confusion and program runaway.
- Embedded sub-board design saves VME rack slots, no additional wiring is required, which simplifies on-site hardware renovation and replacement construction.
- Dual power-off data protection modes ensure safe storage of programs and parameters under short-term maintenance shutdown and long-term equipment outage conditions.
- Three-proof coating and EMC anti-interference design support 24/7 stable operation in harsh industrial environments, with a 10-year standard shelf life at constant temperature of 20℃.
- Standard interface and timing specifications support direct replacement of faulty memory daughterboards of the same capacity without modifying system hardware configuration.
II. Technical Specifications
2.1 Power Supply Parameters
- Power Input: 5V VME backplane bus power supplied by CPU motherboard
- Total Operating Current (CPU+Memory Board): 2.25A
- Backup Power: IC697ACC701 lithium battery for SRAM and system clock
- Protection: ESD, EFT, surge multi-level hardware protection
- Dielectric Withstand Voltage: 1000VAC 1min isolation between signal interface and CPU ground.
2.2 Memory Performance Parameters
- Capacity Options: 128KB SRAM, 256KB SRAM, 256KB SRAM+256KB Flash, 512KB SRAM
- SRAM Data Retention: Up to 6 months under new lithium battery and normal temperature
- Flash Feature: Non-volatile storage, data permanently retained after power failure
- Error Check Mode: Byte-by-byte parity check + periodic CPU global checksum scan
- Standard Shelf Life: 10 years at 20℃ constant temperature.
2.3 Compatibility & Diagnosis Parameters
- Bus Standard: VME C.1 specification, 32-bit parallel high-speed addressing
- Supported CPU Models: IC697CPU780/781/782/788/789
- Diagnosis Items: Memory hardware fault, parity error, battery undervoltage fault, fault code uploaded to PLC register
- Supported Operations: Remote memory erase, program download, memory health inspection via configuration software.
2.4 Environmental & Mechanical Parameters
- Operating Temperature: 0℃ ~ +60℃; Storage Temperature: -40℃ ~ +85℃
- Humidity: 5%~95%RH non-condensing, non-corrosive gas environment
- Vibration Compliant with IEC 60068-2-6; Certifications: CE, UL508
- MTBF ≥220000h; Ingress Protection: IP20.
III. Key Features
- Serves as the essential running memory of 90-70 series PLC, carrying user control programs, process variables, formula and event historical data storage to support stable operation of large-scale automation projects.
- Dual hardware error detection mechanism realizes real-time monitoring of memory integrity, locks controller operation to avoid safety accidents caused by abnormal program execution.
- Dual power-off backup architecture ensures the safe retention of core programs and process parameters under different equipment shutdown scenarios.
- Provides accurate timestamp support for system clock and all operation & fault events, meeting the requirements of safety accident traceability and compliance filing.
- Real-time battery and memory health early warning facilitates predictive maintenance to avoid unexpected system downtime failures.
- Embedded installation realizes system memory capacity expansion without rack reconstruction, reducing technical renovation cost and construction cycle.
IV. Working Principle
After power-off installation and fixing on the CPU motherboard, the memory daughterboard completes hardware initialization, parity check and global checksum self-test when the rack is powered on. The CPU loads the user program into SRAM for cyclic scanning operation, and continuously verifies data integrity and battery voltage during operation. In case of power failure, the lithium battery supplies backup power to SRAM for temporary data retention; the Flash area can permanently store key programs, which can be automatically loaded to restore system operation after long-term power failure and battery exhaustion. After replacing the memory daughterboard, the system automatically identifies the hardware, and the control function can be restored by downloading the backup program.
V. Application Scenarios
- Thermal power plants: Memory expansion and spare part replacement for turbine, boiler auxiliary machine 90-70 main control PLC, used for interlock program, SOE event and unit parameter storage.
- Petrochemical and gas industry: ESD safety control system PLC memory upgrading, realizing permanent backup of safety interlock programs via Flash storage.
- Metallurgy and mining industry: Capacity expansion of main control memory for hot rolling, blast furnace and belt conveying large sequential control systems.
- Environmental protection and building materials industry: Replacement and upgrading of old memory modules for large sewage treatment and cement production line PLC systems.
- Industrial technical renovation projects: Memory capacity expansion for control system program upgrading to avoid system operation abnormality caused by program capacity overflow.
